Chinese Ham Testing

This standard specifies the determination method of trimethylamine in aquatic animals and their products, as well as meat and meat products. This standard is applicable to the determination of trimethylamine in aquatic animals and their products, as well as meat and meat products. The 2 principle samples were extracted with a 5% trichloroacetic acid solution, and the extract was placed in a sealed headspace bottle. Under the action of alkaline solution, trimethylamine hydrochloride was converted into trimethylamine. After 40 minutes of equilibrium at 40 ℃, trimethylamine reached dynamic equilibrium in the gas-liquid phase. The gas was extracted from the headspace bottle and injected into a gas chromatography-mass spectrometer for detection. The retention time (RT) was used to assist in the qualitative analysis of ions (m/z 59 and m/z 42) and quantitative ions (m/z 58), Quantitative analysis using external standard method. 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. 3.1 Reagent 3.1.1 Sodium hydroxide (NaOH) 3.1.1.2 Triacetic acid (CHCL, O:). 3.2 Reagent preparation 3.2.150% sodium hydroxide solution; Weigh 100 g of sodium hydroxide and dissolve it in 100 mL of water at 20 ℃~30 ℃. 3.2.25% trichloroacetic acid solution; Weigh 25g of trichloroacetic acid and dissolve it in water to a constant volume of 500 mI. 3.3 Standard product trimethylamine hydrochloride (CAS: 593-81-7), molecular formula: (CH,), NHCI, purity ≥ 98%, placed in a dryer and stored at 4 ℃. 3.4 Preparation of standard solution 3.4.1 Preparation of trimethylamine standard stock solution; Weigh 0.016 2g of trimethylamine hydrochloride standard solution, dissolve it in a 5% trichloroacetic acid solution and bring to a constant volume of 100mL. Store the trimethylamine standard stock solution with an equivalent concentration of 100 pug/rmL at 4 ℃. 3.4.2: Trimethylamine Standard Use Solution: Take a certain volume of Trimethylamine Standard Stock Solution and gradually dilute it with 5% trichloroacetic acid solution to obtain Trimethylamine Standard Use Solution with concentrations of 1.0 ug/mL, 2.0 ug/mL, 5.0 ug/mL, 10.0 ug/mL, and 20.0 ug/mL, 40.0 ug/mL, respectively

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