Reliable Rapid Screening for Malachite Green, Crystal Violet and Related Metabolites in Seafood & Aquaculture Products
 
 
Product Overview
The NANKAI 4-in-1 Rapid Test Kit is a lateral flow immunochromatographic assay designed for simultaneous screening of:

• Malachite Green (MG)
• Leucomalachite Green (LMG)
• Crystal Violet (CV)
• Leuco Crystal Violet (LCV)

in fish, shrimp and other aquatic products.
Malachite Green and Crystal Violet, together with their metabolites, remain among the most closely monitored prohibited substances in international seafood trade. Regulatory authorities, importers, exporters, retailers and inspection laboratories routinely screen aquatic products for these residues to support seafood safety compliance and market access.
Designed for high-frequency testing environments, this rapid test kit helps users identify potential residue risks quickly and efficiently while simplifying routine seafood safety inspection workflows.
 
 
 
Trusted Worldwide • 20+ Years of Expertise • Field & Laboratory Ready • Certified Analytical Laboratory Verification
NANKAI seafood safety solutions have been widely applied in government monitoring programs, seafood wholesale markets, rapid testing laboratories, seafood processors, exporters, importers and large-scale food safety screening projects.
 
 
 
Advantages & Key Features
3–5 Min Result Reading
Rapid result reading within 3–5 minutes, supporting fast seafood safety screening decisions.
CE & ISO Certified
Manufactured under certified quality systems and aligned with international quality requirements.
High-Sensitivity Single-Use Test
Designed for reliable residue screening and confident pass/fail decision-making.
Visual Readout, No Instrument Required
Results can be interpreted by the naked eye, making the kit suitable for routine field inspection and on-site testing.
Field & Laboratory Ready
Suitable for both laboratory pre-screening and on-site seafood safety inspection workflows.
Room Temperature Storage
Stored at room temperature without cold-chain transportation or refrigerated storage.
Non-Toxic Formulation
Designed for safe routine use in high-frequency testing environments.
Wide Sample Coverage
Applicable to fish, shrimp, shellfish and other aquatic products.
Four High-Priority Targets in One Test
Simultaneous screening of Malachite Green, Leucomalachite Green, Crystal Violet and Leuco Crystal Violet, helping improve testing efficiency and simplify seafood inspection workflows.
 
 
 
Typical Applications
Aquaculture Farms
Routine prohibited-substance monitoring and aquaculture safety screening.
Seafood Processing Plants
Incoming raw material inspection and batch quality control.
Seafood Wholesale Markets
High-frequency seafood safety screening and market supervision programs.
Government Monitoring Programs
Large-scale prohibited-substance monitoring and seafood safety inspection workflows.
Seafood Export Programs
Supports export-oriented residue control and buyer compliance requirements.
Import Verification Programs
Supports supplier qualification and imported seafood safety verification.
Supermarket & Retail Supply Chains
Supplier qualification, incoming inspection and seafood safety verification programs.
Food Safety Laboratories
Rapid pre-screening before confirmatory analytical testing.
 
 
 
Why NANKAI for Seafood Safety Screening
15+ Years of Real-World Seafood Safety Application Experience
NANKAI seafood rapid testing solutions have been continuously applied in aquatic product safety screening programs, regulatory monitoring workflows, wholesale market inspection systems and enterprise quality control applications for more than 15 years.
Industry-Leading Performance in Seafood Safety Programs
NANKAI has been one of China's most widely used seafood safety rapid testing solution providers, supporting government monitoring programs, inspection laboratories, seafood wholesale markets, supermarket supply chains and seafood exporters.
Proven Through Millions of Real-World Screening Applications
Our products have been repeatedly verified through large-scale seafood safety screening programs involving government agencies, seafood inspection laboratories, aquaculture operations, processors, exporters, importers and retail supply chains.
Trusted by Regulators, Industry and Buyers
Supports seafood safety programs that require regulatory confidence, buyer confidence and reliable screening performance throughout the supply chain.
Certified Analytical Laboratory Support
Supported by three CMA, CATL & CNAS certified analytical laboratories equipped with LC-MS/MS and GC-MS/MS analytical platforms for matrix verification, reference method comparison and performance evaluation.
Digital Food Safety & Traceability Experience
Extensive experience supporting food safety monitoring systems, traceability platforms, rapid testing laboratories and large-scale seafood regulatory projects.
 
 
 
Technical Information
Target Analytes

• Malachite Green (MG)
• Leucomalachite Green (LMG)
• Crystal Violet (CV)
• Leuco Crystal Violet (LCV)

Sample Types

• Fish
• Shrimp
• Shellfish
• Aquatic Products

Test Type
Lateral Flow Rapid Test Kit
Result Type
Rapid Visual Screening
Testing Time
3–5 Minutes
Storage Conditions
4–30°C
No refrigeration required during routine storage.
Shelf Life
15 Months
Delivery Time
Typically Available for Shipment Within 1 Working Day
 
 
Available Seafood Safety Rapid Test Targets
Banned Substances & Illegal Additives

• Malachite Green
• Leucomalachite Green
• Crystal Violet
• Leuco Crystal Violet

Antibiotics & Veterinary Drug Residues

• Chloramphenicol
• Fluoroquinolones
• Sulfonamides
• Tetracyclines
• Oxytetracycline
• Florfenicol
• Thiamphenicol
• Metronidazole
• Enrofloxacin
• Ciprofloxacin
• Norfloxacin
• Ofloxacin
• Lomefloxacin

Nitrofuran Metabolites

• AOZ
• AMOZ
• SEM
• AHD

Heavy Metals & Toxic Elements

• Cadmium
• Lead

Seafood Quality Indicators

• Histamine

 
 
Contact Us
Looking for reliable screening solutions for Malachite Green, Leucomalachite Green, Crystal Violet and Leuco Crystal Violet residues in seafood and aquaculture products?
Contact NANKAI Biotech for quotations, product catalogs, technical documents, validation information and application support.
Request Product Information
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Contact Us
 

NANKAI Biotech develops and manufactures rapid testing solutions for real-world food safety risk control.

For more than 20 years, we have focused on fast, practical and reliable rapid screening technologies that help regulators, laboratories, distributors, exporters and food industry QC teams make faster food safety decisions.

NANKAI provides rapid screening and quantitative analysis solutions for pesticide residues, mycotoxins, illegal additives, aquaculture & seafood safety, veterinary drug residues, antibiotics, heavy metals & toxic elements, digital QC, traceability systems and related food safety applications.

What differentiates NANKAI is the combination of large-scale manufacturing, certified analytical laboratory verification and extensive real-world deployment experience.

We operate three CMA, CATL & CNAS certified analytical laboratories equipped with LC-MS/MS and GC-MS/MS platforms, supporting matrix verification, reference method comparison, rapid test performance evaluation and accredited third-party analytical testing services.

Our rapid testing solutions have been applied in Olympic-level food safety programs, major international events, government monitoring projects, grain & feed safety workflows, fruit & vegetable screening, tobacco & tea quality control, seafood and meat safety supervision, traditional herbal material testing, dairy and honey safety programs, factory QC and export risk-control workflows.

Highlights:
• Fast, practical and reliable rapid screening solutions
• 20+ years of rapid testing technology development
• 25,000+ m² manufacturing & laboratory facilities
• Three CMA, CATL & CNAS certified analytical laboratories
• LC-MS/MS & GC-MS/MS analytical capability
• Olympic-level and government project experience
• Billions of real-world screening applications
• Food safety monitoring, traceability and digital regulatory systems

NANKAI Biotech supports international partners with practical, scalable and laboratory-verified rapid testing solutions for food safety risk control.