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Recommended Series | Leukocyte Esterase Detection Substrates: A Complete Solution from Rapid Screening to Precise Analysis
2026/4/24 16:39:14 Browse volume(12)X-Acetate / Tos-Ala-Y / Multi-color Chromogenic Substrates
Leukocyte esterase (LE) is an esterase primarily found in neutrophils, and its activity detection is commonly used for urinary tract infection (UTI) screening and inflammation status assessment. The chemical chromogenic method based on leukocyte esterase has become a widely used mainstream approach in urinalysis and gynecological secretion screening due to its ease of operation and straightforward interpretation.
However, from detailed kinetic studies of enzymes in research settings to large-scale production of IVD kits, the requirements for substrate color development rate, signal sensitivity, and batch-to-batch stability vary drastically at different stages – a single substrate structure cannot meet all needs simultaneously.
Based on years of substrate development experience, GeneSeqTools Bioscience & Technology provides you with a full range of solutions for leukocyte esterase substrates. Through a systematic product matrix, we aim to help every application scenario find the most suitable detection raw material, enabling comprehensive coverage from initial qualitative screening to precise quantitative detection.
From the detection logic of "ester bond hydrolysis" to "color release", the working mechanism of leukocyte esterase detection substrates follows a unified three-step reaction model:
1. Enzymatic Hydrolysis: Leukocyte esterase specifically recognizes the ester bond (-COO-) in the substrate molecule and catalyzes the hydrolysis reaction.
2. Group Release: After ester bond cleavage, an unstable indoxyl intermediate or pyrrole derivative is released.
3. Color Development Reaction: The released compound spontaneously oxidizes in air (indoxyl acetate type) or couples with a diazonium reagent (amino acid coupling type) to form a colored product.
The differences among the substrate series arise from two dimensions:
Dimension 1: The type of linking group determines the color development mode
• Amino acid coupling type: After enzymatic cleavage, it requires coupling with a diazonium reagent for color development; the process is controllable and suitable for quantitative analysis.
• Indoxyl acetate type: Directly oxidizes and develops color after enzymatic cleavage without additional reagents, suitable for rapid screening.
Dimension 2: The position of halogen substituents affects performance parameters
• Halogen substitution (Br/Cl/I, etc.): Affects color development speed, color depth, and stability.
• Typical rule: Di-halogen substitution enables faster and more stable color development. Non-substitution has lower cost but slower color development.
The differences in "reaction pathways, signal types, and detection methods" among different chromogenic systems are the key basis for achieving tiered applications from rapid screening to precise analysis. Relying on systematic research of enzymatic mechanisms and structural design capabilities, GeneSeqTools has built a product matrix that spans from a single detection principle to a multi-scenario adaptable substrate system.
1. Rapid Color Development Screening Substrates
Suitable for biochemical platforms that require data quantification via instruments and have precise OD value requirements.
Representative product: X-Acetate (CAS: 3252-36-6)
Chinese Name: 5-Bromo-4-chloro-3-indolyl acetate
English Name: 5-Bromo-4-chloro-3-indoxyl-3-acetate
Abbreviation: X-Acetate
CAS Number: 3252-36-6
Molecular Formula: C10H7BrClNO2
Molecular Weight: 288.53
Specifications: 1 g / 5 g / 25 g (Custom packaging supported)
Form: Off-white crystalline powder
Product Number: G02040001
Stock: In stock
Color: Indigo blue
Applications:
• Automated biochemical analyzers
• Quantitative determination of enzyme activity in laboratories
Advantages:
• Clear color development with well-defined boundaries.
• Quantifiable detection: Rapid interpretation via color intensity changes, suitable for qualitative or semi-quantitative analysis.
2. High Specificity Recognition Scheme
Main raw material for clinical urine dry chemistry and high-sensitivity detection.
Chinese Name: N-Tosyl-L-alanyloxyindole
English Name: N-Tosyl-L-alanine 3-indoxyl ester
Abbreviation: Tos-Ala-Y
CAS Number: 75062-54-3
Molecular Formula: C18H18N2O4S
Molecular Weight: 358.41
Specifications: 1 g / 5 g / 25 g (Custom packaging supported)
Form: Off-white crystalline powder
Product Number: G02070002
Stock: In stock
Color: Purple
Applications:
• Enzyme activity research
• IVD method development
Advantages:
• Mimics natural substrates with high specificity.
• Controllable reaction process suitable for quantitative analysis.
3. Multi-color Chromogenic Scheme
Suitable for multi-parameter testing scenarios where background color interference needs to be avoided.
Representative products:
• Magenta-Acetate (Magenta, CAS: 102185-48-8)
• Salmon-Acetate (Salmon red, CAS: 114305-99-6)
• Blue-Acetate (Blue, CAS: 17357-14-1)
• Purple-Acetate (Purple, CAS: 60375-15-7)
Applications:
• Multiplex testing
• Differentiation of multiple strains
• Complex sample environments
Advantages:
• Provides multi-color output.
• Enhances contrast against different backgrounds.
• Leukocyte esterase activity detection: Provides a sensitive biochemical indicator for assessing inflammatory responses, infectious diseases, and immune status.
• Leukocyte screening in urine samples: Rapidly determines leukocyte levels in urine, excludes interference from bacterial esterases, enabling fast color development and stable interpretation.
• Core raw material for clinical diagnostic kits: Supports the construction and optimization of multiple platform detection systems, including dry chemistry strips and liquid reagents.
✅ Complete selection: Covers all mainstream substrates from the indole series to the pyrrole series, including color development and colorimetry.
✅ Excellent performance: Strictly controls free indole content, extremely low background, ensuring long-term shelf stability.
✅ Rich colors: Provides a "full color spectrum" selection, completely solving the color overlap interference issue in multiplex testing.
✅ In stock supply: The leukocyte esterase substrate series is regularly in stock, supporting custom requirements from gram to kilogram scale, offering both price advantages and a stable supply capability.
Extended Services
Every detection need has a matching leukocyte esterase substrate solution.
For more multiplex detection substrates for vaginosis and urine or custom services, please call +86-13302967066!
GeneSeqTools Bioscience & Technology is dedicated to providing reliable domestic alternative solutions for gene sequencing, molecular diagnostics, and microbial detection.
For related products such as blood cell dyes and buffer salts, you can view the complete product line and technical specifications on [MedSun Biotechnology Website].
Founded in 2015, it is a high-tech enterprise focusing on microbial testing、 gene sequencing and in vitro molecular diagnostics in the R&D, production, and sales of biochemical reagent raw materials. Committed to providing high-quality biochemical reagent raw materials and professional custom synthesis services, the product portfolio covers more than a dozen categories and nearly a thousand innovative products. Upholding the core philosophy of “customer first, integrity and professionalism”, we serve with dedication to meet customers’ diverse needs in research and testing.
Official WeChat account: Shenzhen GeneSeqTools Bioscience & Technology Co. Ltd.
GeneSeqTools official website: http://www.geneseqtools.com
Hotline: +86 0755-23251735
QQ: 2370561481
Email: sales@geneseqtools.com
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