Esterase Substrate Detection for Streptococcus agalactiae
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Solution Overview
Problem
Current methods for detecting and identifying Streptococcus agalactiae require supplementary biochemical tests and immunoassays after using selective media, which can be cumbersome and lack direct enzymatic substrate detection capabilities, especially under anaerobic conditions.
Innovation Solution
The use of esterase substrates, optionally combined with α-glucosidase, phosphatase, β-cellobiosidase, or N-acetylglucosaminidase substrates, in a reaction medium to specifically detect Streptococcus agalactiae by exploiting its unique inability to utilize these substrates, allowing for early and distinct visualization of colonies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If selective media are used for detecting Streptococcus agalactiae, then bacterial isolation is improved, but additional biochemical tests and immunoassays are required increasing device complexity
Solution Approach 1:
The patent combines multiple detection functions into a single culture medium by incorporating both selective agents (antibiotics) and enzymatic substrates ( hippurate, esterase, alpha-glucosidase, phosphatase, beta-cellobiosidase, N-acetylglucosaminidase) that enable direct visualization of Streptococcus agalactiae through chromogenic reactions, eliminating the need for separate biochemical tests and immunoassays
Solution Approach 2:
The culture medium performs multiple functions simultaneously: it selects for Streptococcus agalactiae through antibiotic suppression of other bacteria, supports bacterial growth through nutrients, and enables direct identification through enzymatic substrate reactions that produce visible color changes specific to S. agalactiae
2Measurement precision
If Granada medium is used for direct detection, then isolation and identification are improved, but anaerobic conditions are required making implementation difficult
Solution Approach 1:
The patent changes the oxygen requirement parameter from anaerobic (Granada medium) to aerobic conditions by using oxidase-negative bacterial selection and oxygen-stable enzymatic substrates, making the detection method easier to implement without requiring specialized anaerobic equipment while maintaining direct detection capability
3Measurement precision
If multiple enzymatic substrates are combined, then detection sensitivity is improved, but medium complexity increases
Solution Approach 1:
The patent segments the detection function into multiple independent enzymatic substrate systems (hippurate for beta-glucuronidase, esterase substrates, alpha-glucosidase substrates, phosphatase substrates, beta-cellobiosidase substrates, N-acetylglucosaminidase substrates), each contributing to the overall detection sensitivity while maintaining functional independence that simplifies the overall medium design
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
Enables rapid and specific identification of Streptococcus agalactiae with high contrast at 18-20 hours of incubation, improving detection sensitivity and specificity without harming the bacteria, and reducing the need for additional tests.
Implementation Method 1
The use of esterase substrates, optionally in combination with at least one α-glucosidase substrate, phosphatase substrate, β-cellobiosidase substrate or N-acetylglucosaminidase substrate, for detecting and identifying Streptococcus agalactiae
Data Source
AI summary
The present invention concerns a method for specifically detecting and identifying Streptococcus agalactiae, using a reaction medium comprising at least one esterase enzymatic substrate.