WO2001002834A1 - Micro-fabricated solubility measuring system and a method for determining the solubility of a sample - Google Patents
Micro-fabricated solubility measuring system and a method for determining the solubility of a sample Download PDFInfo
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- WO2001002834A1 WO2001002834A1 PCT/GB2000/002567 GB0002567W WO0102834A1 WO 2001002834 A1 WO2001002834 A1 WO 2001002834A1 GB 0002567 W GB0002567 W GB 0002567W WO 0102834 A1 WO0102834 A1 WO 0102834A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0046—Sequential or parallel reactions, e.g. for the synthesis of polypeptides or polynucleotides; Apparatus and devices for combinatorial chemistry or for making molecular arrays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
- B01J2219/00277—Apparatus
- B01J2219/00279—Features relating to reactor vessels
- B01J2219/00306—Reactor vessels in a multiple arrangement
- B01J2219/00313—Reactor vessels in a multiple arrangement the reactor vessels being formed by arrays of wells in blocks
- B01J2219/00315—Microtiter plates
- B01J2219/00317—Microwell devices, i.e. having large numbers of wells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
- B01J2219/00583—Features relative to the processes being carried out
- B01J2219/00585—Parallel processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
- B01J2219/00583—Features relative to the processes being carried out
- B01J2219/00603—Making arrays on substantially continuous surfaces
- B01J2219/00659—Two-dimensional arrays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
- B01J2219/0068—Means for controlling the apparatus of the process
- B01J2219/00702—Processes involving means for analysing and characterising the products
- B01J2219/00707—Processes involving means for analysing and characterising the products separated from the reactor apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
- B01L2200/0647—Handling flowable solids, e.g. microscopic beads, cells, particles
- B01L2200/0668—Trapping microscopic beads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0406—Moving fluids with specific forces or mechanical means specific forces capillary forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0415—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
- B01L2400/0487—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure fluid pressure, pneumatics
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- C—CHEMISTRY; METALLURGY
- C40—COMBINATORIAL TECHNOLOGY
- C40B—COMBINATORIAL CHEMISTRY; LIBRARIES, e.g. CHEMICAL LIBRARIES
- C40B60/00—Apparatus specially adapted for use in combinatorial chemistry or with libraries
- C40B60/14—Apparatus specially adapted for use in combinatorial chemistry or with libraries for creating libraries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/006—Dissolution of tablets or the like
Definitions
- the invention relates to a micro-fabricated device for the measurement of the solubility or the rate of dissolution of a sample. Specifically the invention relates to an automated device for the determination of these parameters on large numbers of samples.
- solubility of a sample or its rate of dissolution are important in various areas of the drug discovery process since many processes of interest to the research scientist are dependant on the solubility or rate of dissolution of the sample. Examples where this information is of value would include interpreting data of a sample in; an in vitro assay, oral absorption test, formulation studies, and in vivo bioavailability studies.
- Automation may also lead to increased compound demands which is counter to the thrust of modern synthetic methods such as combinatorial chemistry and MPS and related technologies which, typically, do not produce large quantities of material. Therefore, for the large number of samples which are being prepared for testing, the traditional methods of measuring physicochemical properties are now prohibitively expensive and time consuming and can be performed on no more than a small percentage of the samples being prepared.
- Micro-fabricated devices have been used to develop laboratory techniques on the micro scale which require minimal operator involvement using very small amounts of sample.
- Micro-fabrication techniques are generally known in the art using tools developed by the semiconductor industry to miniaturise electronics, it is possible to fabricate intricate fluid systems with channel sizes as small as a micron. These devices can be mass-produced inexpensively and are expected to soon be in widespread use, for example, in simple analytical tests. See, e.g., Ramsey, J.M. et al. (1995), “Micro-fabricated chemical measurement Systems,” Nature Medicine 1 :1093-1096; and Harrison, D.J. et al (1993), “Micro-machining a miniaturized capillary electrophoresis-based chemical analysis system on a chip,” Science 261:895-897.
- micro-fabricated solubility measuring system comprising a micro fabricated device having a region in the device for receiving solid sample and a liquid inlet for introducing a predetermined amount of a liquid to the region together with a detector which determines directly or indirectly if solid sample is removed from the region by the liquid.
- micro-fabricated solubility measuring system comprising a micro-fabricated device having a region in the device for receiving solid sample and a liquid inlet for introducing a predetermined amount of a liquid to the region together with a detector which determines directly or indirectly amount of solid sample removed from the region by the liquid.
- sample includes any material, single compound or mixture, which may be put into solid form, whether biological or chemical, preferably the sample is an organic synthetic compound, ideally of MW ⁇ 1000.
- the term "region" means an area within the micro-fabricated device, which is able to accept and retain an amount of solid sample and allow that solid sample to come into contact with liquid in the device.
- the region may be formed as a surface on which solid material can be deposited and adhere as a continuous or discontinuous layer. Such a surface may already be part of the surface of the micro-fabricated device or may be applied as a coating.
- the surface incorporates one or more physical structures which define the region, such as indents, which aid retention of defined quantities of solid sample.
- the volume defined by the region may be in the range of sizes which may be created in micro-fabricated devices as described above, such as by etching or building up structures or by moulded replication of structures. Typical region volumes include from 1 nl to 1 ⁇ l. Typical dimensions across regions may be in the range of sizes which may be created in micro-fabricated devices, typical ranges are from 10-1000 ⁇ m, preferably 10-100 ⁇ m.
- Indents may be in the form of extended slots or grooves where the long dimension may exceed lOOO ⁇ m. It will be appreciated that any number of indents may be arranged on the same device, such as to form a pattern, such as a line or grid pattern.
- An indent may be formed by a depression in the surface of the micro fabrocate device or within a raised structure on the microfabricated device. The indents may be sufficiently large to retain all the sample or large enough to retain at least part of the sample the remaining part being above the indent.
- the process of deposition of sample into the region may involve compaction such that the solid cannot be physically washed away but must be removed by a process of dissolution, see Figure 1.
- the sample may be deposited by other processes of application such as a spray or, alternatively, the sample may be deposited from a solution by creating local environments in the region, such as a hydrophobic surface, which forces the compound out of solution, or by evaporation of the liquid and subsequent deposition of the sample.
- the process of deposition may be assisted by use of coatings to the surface of the region to attract and bind the sample.
- the solid sample is transferred to the region so that the amount and thickness of sample is controlled and measurable.
- Sample deposition methods may include pressing solid sample onto a receiving surface, or deposition of mixtures or solutions of the sample in volatile carrier fluid. Samples may not be pure. Additionally the sample may contain solid material which may be insoluble in the solvent used to determine the solubility measurement and added to the sample to aid deposition and/or for formation of a controlled thickness of sample. Such solid materials which may be added may include fibres or ballotini.
- detector includes devices, probes, sensors, indicators or such like which are able to determine the presence or absence of solid sample remaining in the region, either with or without the liquid present, or which are at least able to detect the presence or absence of sample, preferably the detector is able to measure, directly or indirectly the amount of solid sample remaining or removed from the region.
- the detector may operate alternatively by measuring sample present in the liquid. Examples of such detector methods include interferometry where the intensity of interference patterns of reflected light on the surface of the device show the depth of sample in indents, surface acoustic wave sensors, elipsometry, use of radiation sources and sensors measuring attenuation though the solid sample layer, image analysis, spectrophotometry, chromatography or electrophoresis. Physical methods of detecting or measuring the depth of the sample in the region may be employed such as the use of a stylus.
- the detector of the system may be separate to the micro-fabricated aspects of the system ("off- device") or in a preferred alternative option may also be an integrated micro-fabricated feature of a micro-fabricated solubility device ("on-device").
- off- device the micro-fabricated aspects of the system
- on-device an integrated micro-fabricated feature of a micro-fabricated solubility device
- the thickness of the solid sample is defined by means of a micro-engineered feature such as an indent which allows integral calibration for detection methods applied to a range of solid samples whose physical properties such as refractive index and spectral absorbencies are not known a priori. This is particularly valuable for elipsometry.
- Most solid samples of interest are insulators or at least poor conductors of electricity. Dissolution of such solid samples from an electrode surface into an ionically conducting liquid may be monitored by electrical impedance measurements.
- Indents formed so that the base only of indents is electrically conducting allows those conductive bases to be used as electrodes. Coverage of the conductive indent bases may be monitored using electrical impedance between electrode and solution, with a substantial decrease in impedance signalling the dissolution of material covering the electrode.
- Direct detection or measurement of the dissolved sample in solution can be difficult, such as by the use of UV or visible radiation detection methods, if the sample is only weakly absorbing or fluorescent.
- Alternative indirect technique may be used which employ direct measurements of indicator material.
- the indicator material is deposited as a thin film over the bases of any indent which is then filled with solid sample. Exposure of the indicator material or release of the indicator material into solution is delayed until sample dissolution is near completion, and its appearance on the surface or in solution acts as an end point signal.
- Indicator materials may be detected on or off device by the use of, for example, UV detection of fluorescent compounds.
- indicator compounds are preferred so that the indicator does not permeate through the sample nor promote release of the sample from the surface.
- the indicator is mixed with the sample so that the dissolution of the sample releases indicator into the solution, dissolved or suspended, and the quantity of such released indicator is used as a measure of the sample dissolution.
- the indicator for this method should not interact with the substance being measured and may be a fine insoluble powder.
- an optically monitorable feature may be produced by a series of features made from solid sample on a plane surface of the microfabricated device. These features may form diffraction structures. Where the diffraction structures are formed by indents the process of sample dissolution allows development of the diffraction pattern, while for diffraction structures formed from the sample on a plane surface the process of dissolution is accompanied by a decrease in the size of the features and reduction in the intensity of any diffraction effects.
- Such raised features formed from the solid samples may be formed by deposition through masks or grids but do require that the sample adheres well to the substrate surface. The use of indented structures provides more tolerance of variation in physical properties and sample substrate adhesion.
- the device may contain an outlet for removal of the liquid where the liquid is desired to be removed in order for the particular detector used to make the requisite measurement.
- the rate of dissolution of a sample may be affected by many different factors such as the morphology or surface area of the sample, chemical kinetic factors at the solid/ solution interface, permeation of pores within the solid by solvent, and transport of dissolved material in the solvent by convective, advective, or diffusive processes.
- factors such as the morphology or surface area of the sample, chemical kinetic factors at the solid/ solution interface, permeation of pores within the solid by solvent, and transport of dissolved material in the solvent by convective, advective, or diffusive processes.
- convective or advective and in particular turbulent fluid transport so that diffusion may be the dominant mode of transport of dissolved material.
- the dissolution rate is related to the length of the path through which the dissolved solute molecules diffuse and the geometry of the fluid body. Diffusive transfer rates will generally be inversely related to the square of the path length.
- D diffusion coefficients
- L path length
- the distance L across the liquid from solid surface should not be greater than 100 ⁇ m. This has an impact on the liquid volume which may be used in static liquid device of the invention, i.e. preferably a liquid volume up to lOnl, preferably up to 5nl.
- liquid volume can however be readily removed if the liquid is mixed by convective/advective processes within the device and this is a further feature of the invention.
- the fluid is stirred in situ, e.g. by small magnet stirrer, such as beads, or the fluid may be recirculated over the solid.
- the liquid may be removed to a mixer chamber and then reintroduced to the compound. This may avoid problem with mechanical abrasion on the solid solute surface generating suspended matter, and may be more compatible with in situ observation/monitoring of the dissolving solid surface.
- Typical amounts of sample which may be used in this device range from 1 ng to 1 mg, the minimum figure corresponds to the region being and indent corresponding to a 10 micron side cube.
- Typical amounts of liquid used in this device range from 1 nl to 1 ml, the minimum liquid volume corresponds to a 100 ⁇ m side cube.
- a chamber within the device for presenting liquid to the solid sample need not be in the form of a cube but for rapid diffusive transfer no portion of fluid within the chamber should be maintained at a distance from the solid sample much greater than lOO ⁇ m. It may be useful to present a small solid filled indent to a very large volume of stirred liquid to determine a maximum dissolution rate in the absence of any tendency to saturate. It will be appreciated that a true measurement of the solubility of the sample is only possible once sufficient time has elapsed for the sample to be fully dissolved and equilibrium is reached.
- the amount of liquid used will limit the maximal measurement of solubility that may be determined, for example if O.Olmg of solid sample is fully dissolved in 0.01ml of liquid then the maximum determined measurement of solubility of the sample is - at least lmg/ml- the exact measurement could be close to this figure or higher.
- the detector measures the amount of solid sample removed from the region by the liquid.
- the detector need only determine the presence or absence of compound in the region. Where the amount of solid sample deposited in the region and the amount of liquid is known then the absence of any solid sample at the region after exposure to the liquid indicates a minimum solubility that the sample possesses.
- the parameters of sample deposited and liquid used may be set such that the minimal solubility measured is at a cut of point to indicate whether the sample passes or fails the test.
- the rate of dissolution of a sample can be measured in the same system or device as described above by measuring the amount of sample removed from the region by the liquid at various time points before equilibrium is reached.
- Measurement of rate of dissolution may be carried out where the liquid, preferably of predetermined volume, is presented to the solid sample and remains static while measurements are performed.
- dissolution rates may be carried out by measurement with the liquid volume stirred or recirculated, as described above, or where fresh liquid is fed through the chamber containing the solid sample receiving region.
- Additional steps which may be performed in the above methods include extracting the liquid prior to taking the measurement of solid sample removed from the region and/or an initial step of introducing the solid sample into the region of the micro-fabricated device.
- micro-fabricated includes devices including structures capable of being fabricated with lengths in one or more dimensions of less than 1 mm, and especially fabricated on or into planar solid substrates such as silicon wafers using methods readily available to those practising the art of silicon micro-fabrication.
- micro-fabricated devices may have feature of sizes and geometries producible by such means such as photolithography, isotropic and anisotropic etching by wet or dry methods, thick and thin film deposition methods including printing, screen printing, spin and dip coating, evaporation, sputtering, chemical vapour deposition, LIGA, thermoplastic micro-pattern transfer, resin based micro- casting, micro-moulding in capillaries (MIMIC), laser assisted chemical etching (LACE), and reactive ion etching (RTE), or other techniques known within the art of micro- fabrication.
- Planar substrates such as silicon wafers may accommodate single devices or a plurality of the devices of this invention in the same or a plurality of configurations.
- Wafers are available with standard sizes which include wafers with diameters of 3" (7.5cm), 4"(10cm), 6"(15cm), and 8"(20cm), but the structures may be formed on substrates of other dimensions.
- Application of the principles presented herein using new and emerging micro- fabrication methods is within the scope and intent of the invention.
- the term "liquid” means any liquid for which the solubility of the sample is
- liquid may interact with the solid sample simply to achieve physical dissolution alone or may effect some chemical reaction including
- Liquid is introduced to the region such that
- the liquid and solid sample are brought into contact.
- the liquid is delivered as a
- the liquid may be delivered such that it remains static over
- the solid sample for a period of time prior to or after the measurement is made by the detector.
- liquid may be streamed across the solid sample containing region and the
- liquid is streamed over the sample several times by continuous recirculation or by an
- Motion of the liquid may be achieved by the use of physical forces, such as pressure, inertial forces, capillary forces, or the
- Non liquid fluids such as super critical
- fluids and gases and vapours may be substituted for liquids in the above description with the process of dissolution into a liquid being equated generally to the transfer of solid as
- the gas phase which may be characterised may include evaporation, sublimation, or reaction
- solvent fluid is presented to the solid substance.
- This may be delivered as slug of fluid between two regions of a second fluid immiscible with the solvent and in which the solid is not able to dissolve .
- This other fluid might preferably be a gas,such as air or nitrogen, or argon.
- the slug of solvent fluid could be driven into or through the region containing the solid substance or repeated exposure of the solid substance to the solvent can be achieved by oscillating the fluid slug by pumping of the second fluid.
- the solvent fluid may be moved to a solution analysis region where it can be measured/monitored by an analytical means such as UV absorption or mass spectrometry.
- a slug of solvent may be driven repeatedly between substance contact and the analytical region to allow dissolution rate to be monitored towards saturation and determination f the solubility.
- liquid of up to 1 ml or above may be used, preferably up to 0.5ml, and ideally up to lOO ⁇ l.
- high throughput we mean that the invention can achieve a throughput substantially higher than conventional means often 10 to 100 fold increases.
- the method optionally involves parallel processes, i.e. multiple indents are used in parallel.
- One sample may be tested with several different liquids or several samples may be tested with one or several liquids.
- the invention also allows for the simple measurement of the rate of dissolution by placing several identical samples in parallel regions and for each sample exposing it to the liquid for different periods of time.
- the above mentioned process may also simultaneously measure solubility by allowing one or more samples to equilibrate with the liquid.
- the rate of dissolution is measured by taking measurements of the solid sample remaining in the indent at various time points after application of the liquid, necessitating a detector which can operate with the liquid present on the sample, and optionally a final measurement of solubility once equilibrium has been reached.
- an on device detection system where the disappearance of the solid is determined using optical techniques, such as interferometry, see Fig 2.
- the light focused on the sample produces an interference pattern on a suitable focusing device by virtue of the scale and the physical arrangement of features of the grid or mesh and the wavelength of light.
- the rate of change will be related to the rate of dissolution of the compound.
- a diffraction pattern is produced, where the horizontal surfaces of the micro-fabricated device are reflective and the compound is less reflective than the surface of the micro-fabricated device. As the compound dissolves lower reflective horizontal surfaces of the micro-fabricated device are exposed. This will not affect the position of the diffraction pattern but will intensify the lower order diffraction bands. Whilst we do not wish to be bound by theory the intensity of the bands is governed by the formula
- I ( ⁇ ) is the central peak intensity
- N is the number of grating lines
- k is the order number
- a is the pitch of the grating
- b is the width of the reflective horizontal surfaces of the micro-fabricated device.
- the difference in path length for reflections from each layer of reflective surface will preferably be multiples of the wavelength of light in the medium in which measurements are carried out. Where measurements are carried out without removal of the solvent the medium will be the solvent used.
- the height difference between reflective surfaces should preferably be multiples of '/: of the wavelength of light and cosine ⁇ .
- the light source may include or encompass a range of wavelengths and the detection system provide wavelength selectivity, for example by the use of filters.
- some wells or areas of wells of the device shown in Figures 1 and 2 may be left unfilled with compound while others contain compound so that the unfilled areas provide a reference. Where the liquid has been allowed to reach an equilibrium composition, the inclusion of such reference wells without solid sample content allows compensation for effects of refractive index and refractive index change.
- Figure 3 shows the output expected from a device of Figure 2.
- Alternative grating based optical methods may be used to measure the dissolution of solid compound from a surface.
- Using structures of the type represented in Figure 4 allows the periodicity of a grating to be altered as solid compound dissolves.
- the dissolution of sample within the indents so that the solid sample surface initially at position 1 is changed to position 2 exposing a reflective surface in the centre of a well or trench will double the number of lines per unit length of the grating.
- This change in grating period enables detection by means of a change in diffraction angles or spectral shift.
- Similar arrangements where other changes in grating feature spacing are achieved may be achieved by different positioning of reflective surfaces in the wells.
- An alternative arrangement indicated in Figure 5 employs the progressive exposure of a group of adjacent steps to generate an expanding grating or reflective surface which can be monitored optically.
- Electrochemical Detector Forming a series of wall structures overlying a conductive electrode structure allows sample to be retained on the electrode surface contained in indents. Exposure of the electrode by dissolution of the sample is monitored by monitoring a cell impedance as indicated in Figure 6
- piezo sensors such as quartz crystal devices and which may include Surface Acoustic Wave sensors, which are particularly suited to operation on a miniaturised scale.
- Such sensors provides an output related to the mass of material adherent to the device surface.
- a plane mass sensor with sample feature formed on the structure is illustrated in Figure 7.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU56969/00A AU5696900A (en) | 1999-07-06 | 2000-07-03 | Micro-fabricated solubility measuring system and a method for determining the solubility of a sample |
JP2001508031A JP2003503731A (en) | 1999-07-06 | 2000-07-03 | Microprocessing solubility measurement system and method for determining sample solubility |
EP00942267A EP1204852A1 (en) | 1999-07-06 | 2000-07-03 | Micro-fabricated solubility measuring system and a method for determining the solubility of a sample |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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GBGB9915686.1A GB9915686D0 (en) | 1999-07-06 | 1999-07-06 | Device |
GB9915686.1 | 1999-07-06 |
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WO2001002834A1 true WO2001002834A1 (en) | 2001-01-11 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/GB2000/002567 WO2001002834A1 (en) | 1999-07-06 | 2000-07-03 | Micro-fabricated solubility measuring system and a method for determining the solubility of a sample |
Country Status (5)
Country | Link |
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EP (1) | EP1204852A1 (en) |
JP (1) | JP2003503731A (en) |
AU (1) | AU5696900A (en) |
GB (1) | GB9915686D0 (en) |
WO (1) | WO2001002834A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7024955B2 (en) | 2003-03-01 | 2006-04-11 | Symyx Technologies, Inc. | Methods and systems for dissolution testing |
WO2006108908A1 (en) * | 2005-04-14 | 2006-10-19 | Helsingin Yliopisto | Method and apparatus for dissolving solid matter in liquid |
WO2009012923A1 (en) * | 2007-07-26 | 2009-01-29 | F. Hoffmann-La Roche Ag | Dissolution apparatus |
US8505398B2 (en) | 2010-07-29 | 2013-08-13 | Samsung Electro-Mechanics Co., Ltd. | Dissolution properties measurement system using piezoelectric sensor |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1678475A4 (en) * | 2003-10-29 | 2009-11-11 | Mec Dynamics Corp | Micro mechanical methods and systems for performing assays |
JP5575623B2 (en) * | 2010-12-03 | 2014-08-20 | マルボシ酢株式会社 | Insulator used for pressure vessel sensor for dielectric property measurement |
Citations (7)
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- 2000-07-03 JP JP2001508031A patent/JP2003503731A/en active Pending
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- 2000-07-03 WO PCT/GB2000/002567 patent/WO2001002834A1/en not_active Application Discontinuation
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7024955B2 (en) | 2003-03-01 | 2006-04-11 | Symyx Technologies, Inc. | Methods and systems for dissolution testing |
US7234365B2 (en) | 2003-03-01 | 2007-06-26 | Symyx Technologies, Inc. | Methods and systems for dissolution testing |
WO2006108908A1 (en) * | 2005-04-14 | 2006-10-19 | Helsingin Yliopisto | Method and apparatus for dissolving solid matter in liquid |
WO2009012923A1 (en) * | 2007-07-26 | 2009-01-29 | F. Hoffmann-La Roche Ag | Dissolution apparatus |
US8505398B2 (en) | 2010-07-29 | 2013-08-13 | Samsung Electro-Mechanics Co., Ltd. | Dissolution properties measurement system using piezoelectric sensor |
Also Published As
Publication number | Publication date |
---|---|
JP2003503731A (en) | 2003-01-28 |
AU5696900A (en) | 2001-01-22 |
GB9915686D0 (en) | 1999-09-01 |
EP1204852A1 (en) | 2002-05-15 |
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