Polysorbate Quantification via Fluorescence Micelle Assay
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Solution Overview
Problem
Current methods for quantifying polysorbate in aqueous biopharmaceutical formulations are time-consuming, require expensive equipment, and are not compatible with the presence of proteins, limiting their effectiveness and accuracy.
Innovation Solution
A fluorescence micelle assay using N-phenyl-1-naphthylamine is performed without a HPLC system, allowing for the quantification of polysorbate in the presence of peptides or proteins, enabling high-throughput analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectrometry or HPLC-based methods are used for polysorbate quantification, then measurement precision is improved, but analysis time increases and equipment cost increases
Solution Approach 1:
The patent replaces complex mechanical separation systems (HPLC) with a simplified fluorescence-based detection system. The method uses fluorescence micelle assay where the fluorescent dye partitions into polysorbate micelles, allowing direct quantification without chromatographic separation, thus reducing analysis time while maintaining accuracy
Solution Approach 2:
The patent introduces a fluorescent dye (N-phenyl-1-naphthylamine) as an intermediary substance that partitions into polysorbate micelles. This mediator enables indirect detection of polysorbate concentration through fluorescence intensity, providing accurate measurement without requiring complex instrumentation
2Measurement precision
If HPLC-CAD or FMA methods are used for polysorbate quantification, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential detection function from the complex HPLC system, isolating only the fluorescence detection step. By removing the chromatographic separation component and using direct fluorescence measurement, the method maintains precision while dramatically simplifying the required equipment
Solution Approach 2:
The patent employs simple, inexpensive fluorescent dyes and basic cuvettes for measurement, replacing expensive, complex HPLC instruments. The method uses readily available fluorescence spectrophotometers and simple chemical reagents, making the system accessible and easy to operate
3Measurement precision
If conventional polysorbate quantification methods are used, then measurement precision is improved, but ease of operation deteriorates due to protein removal requirements
Solution Approach 1:
The fluorescent micelle assay is inherently selective for polysorbate micelles and does not require protein removal steps. The method automatically distinguishes polysorbate-containing micelles from other formulation components, allowing direct analysis of intact biopharmaceutical formulations without complex sample preparation
Solution Approach 2:
The patent exploits the unique fluorescence properties of the dye when partitioned into polysorbate micelles versus other formulation components. By measuring fluorescence intensity at specific wavelengths, the method selectively detects polysorbate without interference from proteins or other excipients, eliminating the need for protein removal
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 method provides rapid, accurate, and cost-effective polysorbate quantification in aqueous formulations containing peptides or proteins, overcoming the limitations of existing techniques by reducing analysis time and eliminating the need for protein removal steps.
Implementation Method 1
NPN exhibits a low-fluorescence signal in aqueous environments, which increases in more hydrophobic environments such as the core of the micelles
Implementation Method 2
Polysorbates which are non-ionic surfactants form such micelles in aqueous solution. The micelles are formed at and above the critical micelle concentration (CMC)
Data Source
AI summary
The present disclosure is directed to a method (a) for the quantification of polysorbate in aqueous formulations containing polysorbate and one or more (poly)peptides having the following steps: (a.1) providing a sample of the aqueous formulation; (a.2) adding of a solution containing the fluorescent dye N-phenyl-1-naphthylamine to the sample of step (a.1) to obtain a fluorescent dye containing sample to be tested in a fluorescence micelle assay; (a.3) optionally incubating the fluorescent dye containing sample of step (a.2); (a.4) performing a fluorescence micelle assay with the fluorescent dye containing sample obtained in step (a.2) or step (a.3) and (a.5) determining the content of polysorbate present in the sample from the fluorescence micelle assay performed in step (a.4); with the proviso that the method is being performed without the use of a HPLC-system. An additional method (b) of the present invention also allows a high-throughput-screening of a great number of samples. The presence of (poly)peptide(s) does/do not interfere with the fluorescence micelle assay measurement in any way.