FSTest Deltamethrin Rapid Test Kit (10 Tests)

Product Overview

The FSTest Deltamethrin Rapid Test Kit (Colloidal Gold) is a professional-grade, rapid screening tool engineered for the qualitative detection of deltamethrin residues in fresh fruits and vegetables. Deltamethrin is a highly potent pyrethroid insecticide widely used and heavily monitored in global agricultural production. Maintaining strict residue tracking is vital for agricultural growers, fresh food exporters, and food safety laboratory auditors striving to comply with stringent international food safety regulations and Maximum Residue Limits (MRLs).

By eliminating the immediate necessity for complex, expensive laboratory infrastructure, this field-ready assay simplifies sample pesticide extraction into a streamlined, room-temperature workflow. It serves as an essential first-line defense in fresh produce logistics, supply chain collection points, and corporate quality compliance screening programs.

Product Highlights & Key Benefits

· High-Speed Field Turnaround: Complete the entire screening assay workflow and achieve highly reliable visual result readouts within just 6 to 8 minutes post-sample-preparation.

· Dynamic Matrix-Specific Detection Limits: Calibrated to adapt flexibly across diverse agricultural matrices. By adjusting the sample supernatant dilution ratios, the kit precisely targets regulatory cut-off thresholds ranging from 0.1 mg/kg up to 2 mg/kg.

· Comprehensive Fruit & Vegetable Adaptability: Officially validated for cross-commodity verification, covering apple, pear, radish, carrot, tomato, eggplant, pepper, legume vegetables, celeriac, taro, grape, strawberry, cabbage, cauliflower, broccoli, spinach, pakchoi, Chinese cabbage, sweet potato, celery, romaine lettuce, crown daisy, and leaf lettuce.

· Fully Self-Contained Kit Architecture: Arrives fully packed with all necessary consumables—including 10 test cassettes, 10 microwells, 10 centrifuge tubes (2mL), 1 bottle of dedicated extracting solution (50 mL), and 10 sampling bottles (30mL).

· Definite Visual Interpretation: Utilizes a competitive sandwich lateral flow immunochromatographic assay format where the color intensity of the Test (T) line shares an opposite correspondence with the deltamethrin concentration, eliminating analytical ambiguity.

· Safe & Non-Toxic Formulation: The specialized extraction solution supplied in the kit is certified as safe and non-toxic for operators, allowing waste materials to be treated as general chemicals.

Technical Principle: Lateral Flow Immunochromatography

The test strip is based on a sandwich lateral flow immunochromatography mechanism. The test cassette houses an integrated testing window containing an invisible Test (T) zone and a Control (C) zone before fluidics activation.

Extracted Insecticide Residues + Antibody-Conjugates -> Lateral Flow -> Reaction with Pre-coated Recombinant Antigens -> Faded or Absent T-Line (Inhibitory Response)

When a treated sample solution is dispensed into the sample well of the device, the liquid migrates laterally across the surface of the test strip via capillary action and reacts with pre-coated recombinant antigens. The intensity of color on the T test line has an opposite correspondence with the deltamethrin concentration in the sample. If the pesticide residue meets or exceeds the targeted detection threshold, it alters the binding kinetics, causing the T line to fade visibly or disappear entirely. For a clean, negative sample, a strong, distinct red band forms at the T zone. The Control (C) line must always develop after a sample is applied to confirm the test fluidics are functional and valid.

Specifications & General Parameters

Step-by-Step Procedure

1. Simple Sample Extraction & Preparation

·  Comminution: Cut the fresh fruit or vegetable sample into small pieces (approx. 0.5 cm x 0.5 cm).

·  Primary Extraction: Weigh exactly 1.0 ± 0.1 g of sample into a sampling bottle and mix with 3 mL of extracting solution.

·  Mixing & Settling: Vortex or shake the bottle thoroughly for 2 minutes, then let it stand undisturbed for 1 minute to allow the layers to settle.

·  Matrix Dilution: Execute the specific X & Y dilution protocol as defined in the matrix guide section above based on the commodity being verified.

2. Running the Assay

· Prior to testing, ensure the test cassette has equilibrated to a proper operating temperature environment (20–40 degrees C) and place the device on a flat surface.

· Pipette exactly 100 uL of the prepared final sample solution into a reagent microwell, mix for 3 to 5 times using the pipette fluidics, and let it stand undisturbed for 3 minutes.

· Transfer 100 uL of this mixed solution from the microwell directly into the sample well of the test cassette.

· Interpret the visual results between 6 to 8 minutes. (Do not read after 8 minutes, as late chemical shifts render the test invalid).

Results Determination & Action Guide

· Negative (-): Both the Control (C) line and Test (T) line develop a strong, distinct red band. This confirms that deltamethrin insecticide residues are safely below the targeted regulatory threshold limit.

· Positive (+): The Control (C) line develops normally, but the Test (T) line is visibly lighter or fails to appear completely. This indicates that insecticide residues meet or exceed the designated cutoff limit.

· Invalid: The Control (C) line fails to show any visible color band, regardless of the appearance of the T line. This signals an operational error, an uncalibrated pipette, or a compromised strip. The sample must be re-tested using a brand new cassette.

Storage & Packing Specifications

· Kit Capacity:10 tests per box (Test cassettes x 10, Microwells x 10, 2mL centrifuge tubes x 10, Extracting solution (50 mL) x 1, 30mL sampling bottles x 10, User manual).

· Storage Environment:Store tightly sealed in a cool, dry location between 4–30 degrees C. Do not freeze.

· Shelf Life:12 months under proper sealed storage parameters.