Food (toxicology) testing

This standard specifies the mouse biological method, enzyme-linked immunosorbent assay, liquid chromatography, and liquid chromatography for the determination of paralytic shellfish toxins in shellfish. This standard is applicable to the detection of paralytic shellfish toxins in oysters, scallops, and other shellfish and their products. Mouse biological method. 2 Principle: Extracting paralytic shellfish toxins (PSP) from shellfish using hydrochloric acid. Record the death time of mice after intraperitoneal injection of the extract. According to the control table of the relationship between the death time of mice caused by paralytic shellfish toxin and the mouse unit, calculate the mouse unit (MU) of PSP per 100 g of sample crystal by correcting the mouse unit according to the mouse weight to obtain the corrected mouse unit (CMU). Using Shifang clam toxin as the standard, convert rat units into micrograms of toxin and calculate the PSP micrograms per 100g of shellfish meat. The measurement results represent the total amount of PSP toxins present in various chemical structures within the shell meat. Unless otherwise specified, all reagents and materials used in this method are analytical pure, and the water is the first grade water specified in GB/T 6682 1 Reagent 3.1.1 Sodium hydroxide (NaOH). 3.1.2 Hydrochloric acid (HCI). 3.1.3 Anhydrous ethanol (CH, CH2OH). 3.2 Reagent preparation 3.2.1 Sodium hydroxide solution (0.1 mol/L); Dissolve 4.0g of sodium hydroxide in 1 L of water. 3.2.2 Hydrochloric acid solution (0.18 mol/L): Dilute 15.5 ml of hydrochloric acid with distilled water to 1 L. 3.2.3 Hydrochloric acid solution (5 mol/L); Dilute 45 mL of hydrochloric acid with water to 100 ml. 3.2.2.4 acidic ethanol solution; Measure 200 mL of anhydrous ethanol and dilute with water to 1000 ml. Mix well. Adjust the pH to 2.0~4.0.3.3 with a hydrochloric acid solution (5 mol/L). Standard substance: Standard substance: Shifangtoxin standard substance (STX. Co HnrN, O, ● 2HCI, CAS No. 3554-08-6): Purity ≥ 98.0%. 3.4 Preparation of standard solution. 3.4.1 Shifangtoxin standard stock solution (100ug/mL): Accurately weigh an appropriate amount of STX standard substance, dissolve it in acidic ethanol solution, and bring to volume

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