Cationic Polypeptide Textile Treatment for Wash-Durable Bacteriostasis
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Solution Overview
Problem
Existing methods for imparting antimicrobial properties to textile products using cationic polypeptides, such as ϵ-polylysine and protamines, fail to maintain bacteriostatic effects after repeated washing, as the antibacterial agents are often removed during the washing process.
Innovation Solution
A method involving immersing textile products in an aqueous solution containing a cationic polypeptide at specific concentrations and temperatures, ensuring the polypeptide permeates the fibers, thereby retaining bacteriostatic activity even after multiple washes. The solution uses ϵ-polylysine and protamines, with concentrations above 250 ppm and temperatures above 25°C, to maintain the bacteriostatic effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fibers are impregnated with a solution of antimicrobial agent, then the treatment process is simple, but the bacteriostatic effect is removed during washing
Solution Approach 1:
The patent changes the molecular weight parameter of the cationic polypeptide to above 10,000, which fundamentally alters the retention properties during washing. This parameter change enables the bacteriostatic effect to be maintained through multiple washes while still using a simple impregnation process, thus resolving the contradiction between ease of manufacture and reliability.
2Reliability
If cationic polypeptide is used as antimicrobial agent, then safety is high, but bacteriostatic effect is reduced after washing
Solution Approach 1:
The patent applies parameter changes by specifying a molecular weight above 10,000 for the cationic polypeptide. This modification maintains the high safety profile of cationic polypeptides while significantly improving the duration of bacteriostatic action, allowing the effect to persist through multiple washes without compromising safety.
3Reliability
If molecular weight of cationic polypeptide is increased, then bacteriostatic effect retention is improved, but treatment conditions become more specific
Solution Approach 1:
The patent simplifies the treatment conditions by establishing a clear molecular weight threshold (>10,000) for the cationic polypeptide. This single parameter specification provides a straightforward guideline that improves bacteriostatic effect retention without significantly increasing treatment complexity, as it focuses on one key molecular characteristic rather than multiple complex parameters.
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
The method effectively retains the bacteriostatic effect against bacteria like E. coli and S. aureus, ensuring the textile product remains antibacterial after multiple washes, as demonstrated by the bactericidal activity value (L) remaining ≥0, meeting the criteria for antibacterial textile products.
Implementation Method 1
immersing textile products in an aqueous solution containing a cationic polypeptide at specific concentrations and temperatures, ensuring the polypeptide permeates the fibers
Data Source
AI summary
The present invention provides a method for imparting bacteriostatic effect to a textile product by immersing the textile product for 20 minutes or more in an aqueous solution containing a cationic polypeptide at a concentration of 250 ppm or more, which solution has a temperature of 25° C. or more. By bacteriostatically treating a textile product in accordance with such method, the bacteriostatic effect is not reduced and thus retained even after the textile product is washed for a plurality of times.