Study of extraction methods of sulfite in tremella
Selected the tremella as tested sample, extract the sulfites in the tremella. The results showed: in the distilling extract method, HCl (3+1) is the best acidation reagent, 0.1 mol/L NaOH is the best absorbent; the sample recovery rate is 80.13%～81.99%, RSD is 0.231%～0.540%. As to the leaching extract method, using 0.1 mol/L NaOH of room temperature, and a 30 mins soaking time can get the best results, sample recovery rate is 79.41%～82.11%, RSD is 0.554%～0.620%. When the content of sulfites is below 1500 mg/kg, both the distilling and leaching extract methods have the similar extracting effect, the RSD of the two methods is 0.1804% ～ 0.6654%, is satisfactory for the determination of replicates. When the content of sulfites is above 1500 mg/kg, the distilling extract method is better than leaching method.