US20150293097A1 - Preloaded test substrates for testing lal-reactive substances, methods of use, and methods of making - Google Patents

Preloaded test substrates for testing lal-reactive substances, methods of use, and methods of making Download PDF

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US20150293097A1
US20150293097A1 US14/434,273 US201314434273A US2015293097A1 US 20150293097 A1 US20150293097 A1 US 20150293097A1 US 201314434273 A US201314434273 A US 201314434273A US 2015293097 A1 US2015293097 A1 US 2015293097A1
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test substrate
sample
preloaded
lal
preloaded test
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Richard Douglas Godec
Paul Charles Melanson
Matthew Kaddeland STONESMITH
Hong Xu
Yan Huang
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BL Technologies Inc
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General Electric Co
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Publication of US20150293097A1 publication Critical patent/US20150293097A1/en
Assigned to BL TECHNOLOGIES, INC. reassignment BL TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GENERAL ELECTRIC COMPANY
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    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/579—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving limulus lysate
    • G—PHYSICS
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    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
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Definitions

  • Embodiments of the invention relate to the field of determining the concentration of LAL-reactive substances in a sample. More specifically, embodiments of the invention relate to preloaded test substrates and new measurement methods compatible with the United States, European, and Japanese Pharmacopeia Bacterial Endotoxins Tests (“BET”) and global equivalent pharmacopeia BET standards.
  • BET Bacterial Endotoxins Tests
  • Microbial contamination such as gram positive bacteria, gram negative bacteria, yeast, and fungi may cause severe illness and even death in humans. When people become infected with gram negative bacteria, the bacteria may produce fever-inducing bacterial endotoxins. Endotoxins can be dangerous and even deadly to humans. Endotoxin molecules, which are lipopolysaccharide components of cell walls of gram negative bacteria, can be present in drug formulations and surfaces of medical devices, independent of microbial contamination. Endotoxin contamination can happen even if a system passes a sterility test, which is why an independent endotoxin test is required.
  • Hemocyte lysate is amebocyte lysate produced from the hemolymph of various horseshoe crab species, including the Limulus, Tachypleus, and Carcinoscorpius species.
  • a commonly used amebocyte lysate is produced from the hemolymph of Limulus , or Tachypleus species, is referred to as Limulus amebocyte lysate (“LAL”).
  • Routine tests that use LAL as a test reagent include gel clot assays, end point turbidimetric assays, kinetic turbidimetric assays, endpoint chromogenic assays, and kinetic chromogenic assays. Tests that use LAL reagent may also be used to test for glucans, a marker for fungal contamination.
  • aqueous solutions comprising known concentrations of an endotoxin for use as “standards”. These aqueous solutions are typically unstable; therefore they are usually made from powdered toxins at the test location just prior to testing.
  • the LAL reagent also usually comes in powder form and must be reconstituted in an aqueous solution before use.
  • Typical methods may have as many as 248 slow and time consuming pipetting steps, making it an error prone method due to its complexity and contamination prone due to its length and number of manipulations.
  • Some methods include automating one or more pipetting or aliquoting steps, automated mixing of samples, or preloading reagents in test substrates that allow only a very limited number of tests.
  • test substrates and methods wherein the number of steps are reduced significantly, thereby minimizing contamination, timing delays and mismatches, and thus, improving accuracy.
  • the methods are suitable for use with FDA-licensed LAL.
  • the disclosed test substrates and measurement methods are suitable for use in pharmaceutical and biopharmaceutical manufacturing and are compatible with the United States, European, and Japanese Pharmacopeia Bacterial Endotoxins Tests and global equivalent pharmacopeia BET standards.
  • the disclosed embodiments are compatible with endotoxin regulations and standards found in the international Pharmacopeia and consensus standards organizations and global equivalent standards.
  • Embodiments of the invention improve the standard Bacterial Endotoxins Test (“BET”) by the creation of specialized test substrates with detection reagents (may be endotoxin detection reagents and/or LAL-reactive standards preloaded onto the test substrate.
  • detection reagents may be endotoxin detection reagents and/or LAL-reactive standards preloaded onto the test substrate.
  • a preloaded test substrate is disclosed wherein the preloaded test substrate has been preloaded with at least one detection reagent and/or at least one LAL-reactive standard.
  • These preloaded test substrates may be used in tests for determining the concentration of LAL-reactive substances in an aqueous sample.
  • LAL-reactive substance means a substance that reacts with detection reagents.
  • LAL-reactive substances examples include endotoxin or 1,3- ⁇ -D-glucans such as laminarin and curdlan.
  • LAL-reactive standards comprise LAL-reactive substances therein.
  • the present invention may also be used with any commercial source of detection reagents.
  • Suitable detection reagents for detecting LAL-reactive substances include Amoebocyte Lysate ( Limulus Polyphemus or LAL and Tachypleus Tridentatus or TAL), Recombinant Horseshoe Crab Factor C or rFc, Monocyte Activation Type Pyrogen reagents, a mixture of recombinant Factor C and LAL, and preparations that include sushi peptides, sushi peptide fragments, sushi peptide dimers, and other specific binding proteins such as antibodies and receptor binding proteins derived from bacteriophages, and any other reagents capable of reacting with Lipid A to produce a measurable response.
  • Amoebocyte Lysate Limulus Polyphemus or LAL and Tachypleus Tridentatus or TAL
  • Recombinant Horseshoe Crab Factor C or rFc Monocyte Activation Type Pyrogen reagents
  • Monocyte Activation Type Pyrogen reagents a mixture of recombinant
  • the present invention may reduce the number steps the user has to perform in preparing and measuring both the calibration standards and samples. This may reduce the need for a high level of skill, experience, and training, and reduces costs, times, and the opportunity for human error.
  • embodiments of the invention may be configured or utilized in a manner that complies with compendia requirements and FDA regulations.
  • Embodiments of the invention are also suitable for use with all quantitative compendia photometric methods of relating the reaction progress to endotoxin levels, including 1 ) kinetic chromogenic, where the time until the optical absorption changes by a specified amount is related to concentration, 2) endpoint chromogenic, where the optical absorption change over a fixed time is related to concentration, 3) kinetic turbidimetric, where the time unit the turbidity (usually measured by optical absorption) changes by a specified amount is related to concentration, and 4) endpoint turbidimetric, where the turbidity change over a fixed time is related to concentration.
  • At least a portion of the preloaded test substrate may have a modified surface.
  • the surface may be modified using plasma etching.
  • the surface may be modified using at least one coating.
  • the coating may be a static coating, a dynamic coating, or combinations thereof.
  • Suitable static coatings include, but are not limited to, polyethylene glycol (PEG), collagen, and combinations thereof.
  • Suitable dynamic coatings include, but are not limited to, polyethylene glycol (PEG), sodium deoxycholate, and combinations thereof.
  • the preloaded test substrate may have at least one mechanical barrier between at least one of the portions.
  • the mechanical barrier may be soluble.
  • the preloaded test substrate may further comprise a portion identification mechanism, such as a tracer.
  • the preloaded test substrate may be a microplate.
  • the preloaded test substrate may have a barrier material to protect the preloaded test substrate from environmental exposure and surface contamination.
  • a method for measuring a LAL-reactive substance in a sample comprises contacting the sample with a preloaded test substrate wherein at least a portion of the preloaded test substrate has been preloaded with at least one detection reagent and/or at least one LAL-reactive standard, thereby making a prepared sample. An absorbance of the sample may then be measured.
  • At least a portion of the preloaded test substrate may have a modified surface.
  • the surface may be modified using plasma etching.
  • the surface may be modified using at least one coating.
  • the coating may be a static coating, a dynamic coating, or combinations thereof.
  • Suitable static coatings include, but are not limited to, polyethylene glycol (PEG), collagen, and combinations thereof.
  • Suitable dynamic coatings include, but are not limited to, polyethylene glycol (PEG), sodium deoxycholate, and combinations thereof.
  • the preloaded test substrate may be a microplate.
  • the preloaded test substrate may have a barrier material to protect the preloaded test substrate from environmental exposure and surface contamination.
  • Test reagents may be any reagent that aids in testing samples.
  • Suitable test reagents include, but are not limited to detection reagents and LAL-reactive standards. Suitable detection reagents are described above and may comprise amoebocyte lysate. LAL-reactive standards are also described above and include a USP Endotoxin Reference Standard (RSE) that has been calibrated to the current World Health Organization International Standard for Endotoxin.
  • the method may comprise providing a test substrate having a well array comprising a plurality of wells, wherein each well has at least one optical window surface and a plurality of non-optical window surfaces.
  • a first liquid solution having at least one detection reagent therein may be placed on a first non-optical window surface of at least one well.
  • the first liquid solution may be dried on the first non-optical window surface thereby depositing the detection reagent on the first non-optical surface to form a preloaded test substrate.
  • the method for depositing at least one test reagent on a test substrate may further comprise placing a second solution having at least one LAL-reactive standard therein on a second non-optical window surface.
  • the second liquid solution may be dried on the second non-optical window surface thereby depositing the LAL-reactive standard on the second non-optical window surface.
  • test substrate may be a microplate.
  • method may further comprise covering the preloaded test substrate with a barrier material after the drying step to protect the preloaded test substrate from environmental exposure and surface contamination.
  • FIG. 1 shows an embodiment of the invention wherein a test reagent may be deposited on the sidewalls of a microplate.
  • a preloaded test substrate wherein the preloaded test substrate has been preloaded with at least one detection reagent and/or at least one LAL-reactive standard.
  • the preloaded test substrate is designed to measure the BET in samples. It may also be used to provide calibration data from known spikes using a LAL-reactive standard.
  • the preloaded test substrates may be designed to meet all the current BET pharmaceutical regulations requirements and may be used with turbidimetric, chromogenic, and gel-clot BET methods.
  • the LAL-reactive standard may be endotoxin that has been calibrated to the relevant regulatory master endotoxin (CSE) and the regulatory master endotoxin standard (RSE). Where other methods are acceptable or have been validated as being equivalent and acceptable to regulatory agencies, a stored calibration based on historical data can be used instead of the results from individual standards.
  • preloaded test substrates and methods wherein the number of testing steps are reduced significantly, thereby minimizing contamination, timing delays and mismatches, and thus, improving accuracy.
  • the methods are suitable for use with FDA-licensed detection reagents.
  • the methods may be used with a standard absorbance or microplate reader with built in thermal control, a mixer, and an optical reader to determine the BET results.
  • the LAL-reactive standard may preloaded in at least three different portions of the preloaded test substrate. These three different portions may form a calibration portion.
  • the concentration of the LAL-reactive standard in each portion may be the same or different. If endotoxin is used, the first portion may have an amount such that when an aqueous sample (or blank water) is present in that portion, the endotoxin concentration in the sample ranges from 0.005 to 0.5 EU/mL. Similarly, the second portion may have an amount corresponding to a concentration ranging from 0.05 to 5.0 EU/mL and the third portion may have an amount corresponding to a concentration ranging from 0.5 to 50 EU/mL.
  • At least two portions of the preloaded test substrate may form a sample measurement portion.
  • the two portions may be loaded with a LAL-reactive standard to form spikes.
  • the detection reagent and/or LAL-reactive standard may be deposited onto various test substrates, such as onto the sidewalls of a microplate well to allow a sample blank measurement, onto the optical window of a microplate well, onto a soluble coating, or onto an optically translucent or reflective insoluble film.
  • the test reagents may be added as dried beads or coarse particles, or deposited into a carrier media that is added to the test substrate.
  • At least a portion of the preloaded test substrate may have a modified surface.
  • the surface may be modified using plasma etching.
  • the surface may be modified using at least one coating.
  • the coating may be a static coating, a dynamic coating, or combinations thereof.
  • Suitable static coatings include, but are not limited to, polyethylene glycol (PEG), collagen, and combinations thereof.
  • Suitable dynamic coatings include, but are not limited to, polyethylene glycol (PEG), sodium deoxycholate, and combinations thereof.
  • the preloaded test substrate may have at least one mechanical barrier between at least one of the portions.
  • the mechanical barrier may be soluble.
  • the test substrate with preloaded reagents may be packaged such it is sealed from the environment by using a barrier material that prevents moisture, bacteria, and endotoxin agents from contaminating the preloaded reagents.
  • the preloaded test substrate may have a barrier material to protect the preloaded test substrate from environmental exposure and surface contamination.
  • the preloaded test substrate may be a microplate.
  • Sample introduction errors may be further reduced by a plurality of optional identification mechanisms on the preloaded test substrate or in a reader configured to read or measure samples in the test substrate.
  • the identification mechanisms may identify the sample to the user or notify the user if additional reagents are required.
  • Suitable identifications means may include optical markers such as color markers, alphanumeric markers, or light emitting diodes.
  • the identification mechanism may be a tracer.
  • a tracer is an inert compound that is added to a fluid to aid in determining the volume, fluid location and movement (fluid motions). The tracer may also be used to aid in validating the measurement data.
  • Suitable tracers include, but are not limited to, dyes.
  • sample may include not only the sample to be analyzed, but water that shows no reaction with the detection reagent or lysate employed at the detection limit. Samples of non-reactive water may also be referred to as “LAL Reagent Water”, “Water for BET” or “Water for Injection”.
  • the method may comprise contacting the sample with a preloaded test substrate wherein at least a portion of the preloaded test substrate has been preloaded with at least one detection reagent and/or at least one LAL-reactive standard, thereby making a prepared sample. An absorbance of the sample may then be measured.
  • the sample may contact more than one portion of the test substrate.
  • the prepared sample contacting the preloaded test substrate may or may not come into contact with a test reagent.
  • the prepared sample may be a “blank” or negative control that does not contact any test reagent, or only comes into contact with a detection reagent.
  • a portion of the substrate may be further preloaded with at least one LAL-reactive standard. If the LAL-reactive standard is an endotoxin standard, it may be present in a plurality of concentrations, wherein each concentration is present on a different portion of the substrate as described above.
  • the endotoxins may be preloaded onto the substrate such that a “standard curve” may be generated as required in USP 85.
  • the plurality of endotoxin standard concentrations may be used to generate a standard curve.
  • At least a portion of the preloaded test substrate may have a modified surface.
  • the surface may be modified using plasma etching.
  • the surface may be modified using at least one coating.
  • the coating may be a static coating, a dynamic coating, or combinations thereof.
  • Suitable static coatings include, but are not limited to, polyethylene glycol (PEG), collagen, and combinations thereof.
  • Suitable dynamic coatings include, but are not limited to, polyethylene glycol (PEG), sodium deoxycholate, and combinations thereof.
  • the preloaded test substrate may be a microplate.
  • the preloaded test substrate may have a barrier material to protect the preloaded test substrate from environmental exposure and surface contamination.
  • Test reagents may be any reagent that aids in testing samples.
  • Suitable test reagents include, but are not limited to detection reagents and LAL-reactive standards. Suitable detection reagents are described above and may comprise amoebocyte lysate. LAL-reactive standards are also described above and include a USP Endotoxin Reference Standard (RSE) that has been calibrated to the current World Health Organization International Standard for Endotoxin.
  • the method may comprise providing a test substrate having a well array comprising a plurality of wells, wherein each well has at least one optical window surface and a plurality of non-optical window surfaces.
  • a first liquid solution having at least one detection reagent therein may be placed on a first non-optical window surface of at least one well.
  • the first liquid solution may be dried on the first non-optical window surface thereby depositing the detection reagent on the first non-optical surface to form a preloaded test substrate.
  • the LAL-reactive standard may be present in a plurality of concentrations, wherein each concentration is present in a separate well of the test substrate.
  • the method for depositing at least one test reagent on a test substrate may further comprise placing a second solution having at least one LAL-reactive standard therein on a second non-optical window surface.
  • the second liquid solution may be dried on the second non-optical window surface thereby depositing the LAL-reactive standard on the second non-optical window surface.
  • test substrate may be a microplate.
  • method may further comprise covering the preloaded test substrate with a barrier material after the drying step to protect the preloaded test substrate from environmental exposure and surface contamination.
  • Suitable test substrates include any test substrate that aids in evaluating or testing a sample, such as microplates available from Sigma-Aldrich, or microtiter plates.
  • the microplate ( 100 ) may have multiple sample wells ( 102 ) arranged in a 2 by 3 rectangular matrix. Microplates typically have 6, 24, 96, 384, or 1536 wells. In one embodiment, the microplate ( 100 ) may have 96 wells ( 102 ).
  • the sidewalls ( 104 ) and bottoms ( 106 ) of the wells ( 102 ) may be curved or straight, such that the wells are semi-spherical, cylindrical, or rectangular in shape.
  • the plate may also comprise a substantially planar bottom surface ( 108 ) such that the microplate rests flat on working surfaces.
  • Working surfaces may include, but are not limited to, the ground, lab bench tops, microplate readers, and heating plates, as well as manufacturing surfaces such as, tables, conveyors, and rollers.
  • microplate does not rest on a working surface at all, but is suspended above the working surface via a suspension means such as hooks, clips, etc.
  • the microplate may be made of a variety of materials, including polystyrene and polypropylene, or polycarbonate.
  • An optical detection microplate may be made with polystyrene or other suitable polymer that does not interfere with the chemical performance of the test reagents with the sample.
  • titanium dioxide may be added to make the polystyrene white to aid in optical absorbance methods.
  • One or more portions of the test substrate may have modified surfaces.
  • the portions with modified surfaces may include, but are not limited to, the sidewalls and wells.
  • the surfaces may be modified by any means known to those of ordinary skill in the art, including but not limited to, applying a coating, radiation, plasma etching, UV light and ozone, or dissolved reagents which may dynamically cover the surface, so that the interaction of the surfaces and reagents or samples mimic that of standard microplate analysis so that the manufacturer's specifications or compendia standards for analysis are met.
  • the surfaces of the test substrate may be modified to control the biochemical LAL and LAL-reactive substance interaction or to control the surface energy. Controlling the level of the surface chemical interaction with the reaction chemistries may improve the repeatability and accuracy of the biochemical performance.
  • materials suitable for manufacturing the test substrates may also biochemically inhibit or enhance the LAL or LAL-reactive substance reaction chemistry. This biochemical interaction between the material surface and the reaction chemistries may be controlled or reduced with the application of a coating or through a chemical modification of the surface. Additionally, the unmodified surface of the test substrates may have an undesirable surface energy for the microfluidics present on the test substrate.
  • the surface energy may also be modified to a desired value through chemical modification or the addition of a coating to make the surface energy more hydrophilic or more hydrophobic, or to achieve any other surface energy between these states.
  • the microfluidics present on the test substrate may also be optimized.
  • test substrate surfaces include plasma etching, where the surface is modified by having it exposed to plasma to affect a particular final surface chemical structure. Different elements may be added to the plasma to modify the chemistry of the surface, for example, oxygen or ammonia. Additional means include the use of permanent static or dynamic surface coatings. Static surface coatings may be added to form a layer on the test substrate surface to change the surface character. Static surface coatings may be applied as a solution with a solvent and dried or applied by surface grafting wherein the coating is chemically bonded to the surface. Examples of static coatings that may be grafted or applied as a coating include, but are not limited to, polyethylene glycol (PEG) and collagen.
  • PEG polyethylene glycol
  • Dynamic surface coatings may be added to the reagents, samples, or standards and coat the surface in situ as fluids move on the test substrate or in sample wells.
  • dynamic coatings include, but are not limited to PEG and surfactants like sodium deoxycholate.
  • the method may comprise providing a microplate having a well array comprising a plurality of wells, wherein each well has at least one optical window surface and a plurality of non-optical window surfaces; providing a liquid solution having at least one test reagent therein; placing the liquid solution on a first of said non-optical window surfaces of at least one well; and drying the liquid solution on the first non-optical window surface, thereby depositing the test reagent on the first non-optical window surface.
  • the deposition steps may be repeated on subsequent non-optical window surfaces such that additional test reagents are deposited on subsequent sidewall portions.
  • test reagents may be added to non-optical window surfaces of the well, to allow an initial optical measurement of the sample before the test reagents have had a chance to mix. This is useful for determining the optical zero.
  • each test reagent has an optical signature that may be used to check that the correct levels of test reagents are added, prior to the reaction beginning.
  • each test reagent may be tagged with an optical material that is inert to the endotoxin test reaction. If the user finds incorrect levels of the expected levels of test reagents prior to the reaction taking place (reaction lag phase period), then the user may reject the measurement test for that sample. This is of great value to the pharmaceutical user, as any Out Of Specification (OOS) test must be evaluated and explained.
  • OOS Out Of Specification
  • the method may comprise providing a liquid solution having at least one test reagent therein; providing a microplate having a substantially planer bottom surface, a plurality of edges ( 110 ), and a well array, wherein the bottom surface is substantially parallel with respect to a horizontal working surface ( 112 ), and wherein the well array comprises a plurality of wells having a plurality of sidewalls.
  • a first of the plurality of edges ( 110 ) may be tilted such that the first edge is inclined ( 114 ) in a generally perpendicular orientation with respect to the horizontal working surface, such that the bottom surface is no longer substantially parallel with respect to the working surface and such that a sidewall portion closest to the working surface is in a generally parallel orientation with respect to the working surface.
  • the liquid solution may be placed ( 116 ) on the sidewall portion and then dried, thereby depositing the test reagent on the sidewall portion.
  • Any means suitable to transferring a liquid may be suitable, including, but not limited to, a pipette, or a spray nozzle.
  • any drying process is suitable for the present invention, as long as the drying process does not alter the reactivity of the test reagents.
  • drying processes include, but are not limited to, a vacuum drying process at ambient temperature or a freeze drying process (lyophilization).
  • the liquid solution may be dried at ambient temperature or freeze dried. It should be understood that the liquid solution need not be dried completely; it may be partially dried, especially if non-aqueous solvents are used. It is sufficient that the test reagent is physically immobilized after it is deposited such that it remains in place. There may be some liquid still present after the test reagent is immobilized if a glycerin paste is used, as in certain pharmaceuticals and other materials prepared for stable storage. The same process may be used with both round-walled and flat-walled wells. The tilt-position of the microplate may be maintained during the deposition steps through the use of a supporting means such as a stand or brace.
  • the microplate may be rotated and the deposition steps may be repeated with subsequent edges of the microplate such that additional test reagents are deposited on subsequent sidewall portions.
  • at least one test reagent comprising an endotoxin detection reagent may be present in every well.
  • at least one test reagent compromises an endotoxin standard.
  • the endotoxin standard may be present in a plurality of concentrations, wherein each concentration is present in a different well.
  • the microplate may further comprise a well identification mechanism.
  • Chemical means may include the use of chemical additives.
  • chemical additives include solubility enhancing agents, such as the saccharides sucrose, glucose, and mannitol, as well as anti-flaking agents, such as aqueous polymer solutions comprising poly(ethylene oxide), hydroxypropyl cellulose, or hydroxypropyl methyl cellulose, or agents designed to prevent degradation such as dextran and various saccharides such as lactose and trehalose.
  • Physical means may include various coating, spraying, or drying techniques during the deposition process.
  • a detection reagent may be deposited in every well. Alternatively, there is no detection reagent in any of the wells, allowing the user to add detection reagent from a preferred supplier.
  • the detection reagent may be amoebocyte lysate.
  • the use of the natural absorption of LAL, or the addition of turbidimetric or chromogenic non-LAL reactive tracers to the LAL and endotoxin may also be used to reduce testing errors.
  • the LAL-reactive standard may be deposited in only a portion of the wells.
  • various wells may be preloaded or predeposited with LAL-reactive standard with different concentrations of the LAL-reactive substance therein, such that the user merely has to add the sample to be tested to the wells.
  • the detection reagent and LAL-reactive substance may be deposited in the wells such that all of the tests and replicates required by USP 85 may be performed simply by adding the samples.
  • each well comprises either a separate given test, or a replicate of a given test.
  • the lowest concentration may be confirmed in four replicates, wherein 4 of the 96 wells each comprise one replicate.
  • the wells may be preloaded with LAL-reactive standards such that the inhibition/enhancement tests (or “spikes”), including replicates, may be performed.
  • the wells may be preloaded such that the quantitative tests, wherein the concentration of bacterial endotoxins in a given sample is quantified, may be performed.
  • the wells may be preloaded such that all the tests and replicates required under USP 85, including the lysate sensitivity, the inhibition/enhancement, and quantitative tests, may be performed on the same microplate. Similar concepts may be employed with any test substrate or any portion of a test substrate and are not limited to microplates with wells.
  • the wells may be covered with a seal means, such as an adhesive label with adhesive only on the portions of the label outside the well opening.
  • the seal means may be made of a barrier material that prevents the passage of water and oxygen, whereby the wells may be kept dry to a humidity level less than about 5%.
  • the disclosed methods may be used to pre-deposit LAL reagents, chromogenic reagents and endotoxin in pre-cleaned (endotoxin free) 96 or 384-well microplates.
  • the test reagents in a liquid solution, may be placed on the walls of the wells, or on the optical window surface of the optical well.
  • the liquid solution may also comprise chemical additives such as solubility enhancing agents and anti-flaking agents.
  • the disclosed methods allow the reagents to be deposited on the walls of the standard 96 or 384-well microplates without interfering with the optical window or the optical path, thereby allowing an initial sample absorption measurement.
  • test substrate wherein at least a portion of the test substrate has been preloaded with at least one test reagent.
  • the test substrate is suitable for optical monitoring of liquids and use in performing LAL assays for endotoxins or glucans.
  • Reagents for the LAL assays may be isolated in segments of the test substrate.
  • the test substrate may be disposable.
  • the test substrate may have a variety of forms, geometries and shapes, including a typical microplate shape. Other suitable forms include, but are not limited to, cards, cartridges, or discs.
  • the test substrate may also be configured such that samples and fluids may be added to it.
  • the test substrate also allows for mixing of samples as the test substrate is shaken, swirled, spun or rotated.
  • the test substrate also allows for the optical monitoring of liquids.
  • the test substrate can be used for performing analytical functions including, but not limited to, measurement of samples with an added positive product control that is an endotoxin or glucan spike, measurement of water blanks (free of endotoxin or LAL reagent), measurement of a series of at least three calibration solutions. Moreover, the test substrate may be used for performing all the analytical functions listed in two or more duplicates.
  • the test substrate may be used with an optical apparatus or reader that measures the times between optical absorption states or the optical absorption change between times.
  • the preloaded test substrate may also be used for confirmation that the reagents and analyzer meet specifications, calibration for conversion to endotoxin or glucan concentrations in the sample, validation of performance or meeting compendia or the optical apparatus manufacturers' specifications, and measurement of the samples being analyzed.
  • the test substrate may be made from any suitable material.
  • portions of the test substrate may be coated with polymer materials, surface treatments, or coatings to meet compendia or the test reagent manufacturers' specifications.
  • a portion of the test substrate may be coated with a static coating to reduce LAL reagent or standard loss.
  • Another portion of the test substrate may be coated with a dynamic coating of the microplate wells to reduce LAL reagent or standards loss.
  • the dynamic coating may also be mixed with standards or reagents.
  • test substrate may also be coated with additives to aid, or regulate, proper analysis and interactions of test reagents or sample materials.
  • additives include, but are not limited to solubility aids, transport aids, and stabilizers.
  • the test substrate may comprise mechanical barriers separate reagents to prevent interaction as they are being isolated in the test substrate or being stored long-term.
  • the barriers may be insoluble and arranged such that they do not interfere with optical measurements.
  • Other barriers may be soluble to some extent so that they dissolve during measurement and do not interfere with it.
  • test substrate may be preloaded with standards and spikes made from control standard endotoxin (CSE) or reference standard endotoxin.
  • CSE control standard endotoxin
  • the spikes may be stored as dried material so that they are at the correct concentration while not diluting or interfering with the sample being spiked.
  • the following example demonstrates an embodiment wherein endotoxin standards are preloaded onto the test substrate.
  • the endotoxin standard range is shown in Table 1.
  • the endotoxin standard range may be different in other embodiments.
  • Table 2 is a description of the preloaded test substrate, wherein the test substrate has 96 portions. Column 1 indicates the portion of the test substrate. Column 2 indicates the sample that the operator must add to the test substrate. Each portion of the test substrate may be preloaded with a different endotoxin standard concentration as shown in Column 3. Column 4 is a description of the BET test that may be completed in each portion.
  • the endotoxin detection reagent is not shown in Table 2 as all 96 portions may be preloaded with the same amount of an endotoxin detection reagent. Alternatively, the test substrate may not have any endotoxin detection reagent, allowing the operator to add an endotoxin detection reagent from a preferred supplier.

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