Study on the Change of Nitrite Content of Yutang Pickles under Different Storage Conditions

Objective: To study the determination conditions of nitrite in pickles by spectrophotometry, select the best experimental conditions, determine the content of nitrite in pickles under different storage conditions, and find a better storage method for pickles. Methods: A certain amount of pickle was homogenized. Saturated boric acid and deionized water were added. The water bath was cooled to room temperature. Potassium ferrocyanide and zinc acetate were added and filtered to obtain a backup filtrate. The nitrite was used as a standard to determine the pickle sample solution at 538 nm. Absorptance at place. Results The nitrite concentration of the sun-dried sample: 1.8435 mg/kg dry; 0.3441 mg/kg with pickling solution; the nitrite concentration of the indoor light sample during the day: 0.5462 mg/ kg dry; 0.2048 mg/kg with pickling solution; Nitrite concentration of samples in cabinets protected from light: dry 1.84 mg/kg; with pickling solution 1.2973 mg/kg; nitrite concentration of samples at high temperature (27 degrees C): 1.2973 mg/ kg; room temperature (20 degrees C) samples Nitrate concentration: 0.7511 mg/kg; Nitrite concentration at low temperature (7 degrees C): 0.2048 mg/kg. Conclusion: The dry sample has a higher nitrite content than the pickled solution sample, the dark sample has a higher nitrite content than the strong light sample, and the high temperature sample has a higher nitrite content than the low temperature sample. Therefore, storage conditions such as pickling solution, proper light and low temperature are selected.