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Detection of Paralytic Shellfish Toxins in Southern Rock Lobster Jasus edwardsii Using the Qualitative Neogen™
Juan José Dorantes-Aranda1, Aiko Hayashi1, Alison R Turnbull2
1University of Tasmania, Institute for Marine and Antarctic Studies, Private Bag 129, Hobart, TAS 7001, Australia.
Background:
Paralytic shellfish toxins (PST) are a significant problem for the Tasmanian shellfish and Southern Rock Lobster (Jasus edwardsii) industries, and the introduction of a rapid screening test in the monitoring program could save time and money.
Objective:
The aim was to perform a single-laboratory validation of the Neogen rapid test for PST in the hepatopancreas of Southern Rock Lobster.
Methods:
The AOAC INTERNATIONAL guidelines for the validation of qualitative binary chemistry methods were followed. Three different PST profiles (mixtures) were used, of which two were commonly found in naturally contaminated lobster hepatopancreas (high in gonyautoxin 2&3 and saxitoxin), and the third toxin profile was observed in a few select animals (high in gonyautoxin 1&4).
Results:
The Neogen test consistently returned negative results for non-target toxins (selectivity). The probability of detection (POD) of PST in the lobster hepatopancreas using the Neogen test increased with increasing PST concentrations. POD values of 1.0 were obtained at ≥0.57 mg STX-diHCl eq/kg in mixtures 1 and 2, and 0.95 and 1.0 for mixture 3 at 0.79 and 1.21 mg STX-diHCl eq/kg, respectively, with a fitted POD of 0.98 for 0.80 mg STX-diHCl eq/kg. The performance of the Neogen test when using four different production lots (ruggedness) showed no significant differences.
Conclusions:
The results of the validation study were satisfactory and the Neogen test is being trialed within the Tasmanian PST monitoring program of Southern Rock Lobster.
Highlights:
The Neogen rapid kit was successfully validated for the detection of PST in Southern Rock Lobster hepatopancreas.
