Polysorbate Quantification via ATR-FTIR Internal Standard
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Solution Overview
Problem
Existing methods for quantifying polysorbates, such as polysorbate 80, in complex mixtures face interference from matrix constituents, requiring complex and time-consuming sample preparation, and lack sensitivity and specificity.
Innovation Solution
A method using Attenuated Total Reflectance-Fourier Transform Infrared spectroscopy (ATR-FTIR) that involves obtaining a mid-infrared spectrum of a test sample with an internal standard, identifying specific peaks, and comparing normalized peak areas to a calibration curve to determine polysorbate concentration without prior chemical pretreatment of the sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (colorimetry, HPLC, GC, GC-MS) are used to quantify polysorbates, then quantification can be achieved, but matrix interference occurs requiring complex and time-consuming sample preparation
Solution Approach 1:
The patent extracts only the essential spectral information needed for quantification by using ATR-FTIR to directly measure the carbonyl peak area ratio between polysorbate and internal standard, eliminating the need for complex sample preparation steps such as extraction, derivatization, or separation that are required by conventional methods
Solution Approach 2:
The patent introduces an internal standard (azide) as an intermediary substance that does not interfere with the polysorbate measurement but provides a reference peak for normalization, thereby compensating for matrix effects and eliminating the need for complex sample preparation while maintaining quantification accuracy
2Measurement precision
If conventional methods are used for polysorbate quantification, then concentration can be determined, but the process is time-consuming due to complex preparation
Solution Approach 1:
The patent extracts only the essential spectral information needed for quantification by using ATR-FTIR to directly measure the carbonyl peak area ratio between polysorbate and internal standard, eliminating the need for complex sample preparation steps such as extraction, derivatization, or separation that are required by conventional methods
Solution Approach 2:
The method enables direct measurement of polysorbate concentration in complex matrices without requiring external sample preparation interventions. The ATR-FTIR technique with internal standard normalization allows the system to self-correct for matrix effects, eliminating time-consuming preparation steps while maintaining accuracy
3Quantity of substance
If conventional test methods are used, then polysorbate concentration can be measured, but sensitivity and specificity are insufficient due to matrix interference
Solution Approach 1:
The patent introduces an internal standard (azide) as an intermediary substance that does not interfere with the polysorbate measurement but provides a reference peak for normalization, thereby compensating for matrix effects and eliminating the need for complex sample preparation while maintaining quantification accuracy
Solution Approach 2:
The patent changes the measurement parameter from absolute peak area to normalized peak area ratio (polysorbate carbonyl peak area divided by internal standard peak area), which transforms the measurement into a relative quantity that is insensitive to matrix effects, thereby improving sensitivity and specificity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for accurate and efficient quantification of polysorbate 80 in complex formulations, including vaccine components, without interference from the matrix, and demonstrates high sensitivity and specificity, as confirmed by GC-MS results.
Implementation Method 1
obtaining a mid-infrared Attenuated Total Reflectance (ATR) spectrum of the test sample
Implementation Method 2
Attenuated Total Reflectance-Fourier Transform Infrared spectroscopy (ATR-FTIR)
Data Source
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AI summary
A method for determining a concentration of a polysorbate species, such as polysorbate 20, polysorbate 40, polysorbate 60, or polysorbate 80, in a mixture comprises obtaining a test sample of said mixture, adding an internal standard, preferably azide, to said test sample, obtaining, with a spectrometer, a mid-infrared Attenuated Total Reflectance (ATR) spectrum of the test sample, e.g. by using and ATR-FTIR apparatus, identifying, from the reflectance spectrum, a wavenumber corresponding to the C=0 peak (e. g., 1735 cm-1), identifying, from the reflectance spectrum, a wavenumber corresponding to the internal standard, calculating the area under the curve for said C=O wavenumber, normalized by the internal standard, and comparing said area to a calibration curve to determine the concentration of polysorbate in said test sample.