48批燕窝的亚硝酸盐含量测定及浸泡和炖煮对燕窝中亚硝酸盐含量的影响

Content Determination of Nitrite and Effects of Soaking and Stewing on Its Content in 48 Batches of Edible Bird's Nest

目的:测定从香港市场上随机采购的来自18个产地的48批燕窝(含白燕、黄燕和血燕)中亚硝酸盐的含量,并探讨浸泡和炖煮等处理方法对燕窝中亚硝酸盐含量的影响。方法:亚硝酸盐的含量按照国家标准(GB 5009.33—2016),采用柱后还原和衍生化+离子色谱法进行测定,检测波长为532 nm。测定的样本包括燕窝原材料、经过浸泡后及炖煮后的燕窝等。结果:48批燕窝原材料样本中亚硝酸盐的含量范围为0~6 429.58 mg/kg;仅6个样品亚硝酸盐的含量<30 mg/kg,符合《卫生部关于通报食用燕窝亚硝酸盐临时管理限量值的函》的要求。由于亚硝酸盐易溶解于水,经浸泡及清洗后,可有效去除燕窝中的亚硝酸盐,去除率平均>90%,最高可达97%;经过炖煮后的样品检测不到亚硝酸盐。结论:48批燕窝样本中均含有亚硝酸盐,各类燕窝中亚硝酸盐的平均含量由高至低依次为血燕>黄燕>白燕;经过浸泡及清洗能有效清除燕窝上的亚硝酸盐,经过炖煮后的燕窝中亚硝酸盐含量均低于检测水平。

OBJECTIVE： To determine the content of nitrite in 48 batches of edible bird＇s nest（ white,yellow and blood bird＇s nest） which were randomly extracted from 18 productive origins in Hong Kong market,and to probe into the effects of soaking and stewing on nitrite in edible bird＇s nest. METHODS： According to national standard（ GB 5009. 33—2016）,content of nitrite was determined by post-column reduction and derivatization and ion chromatography. The detection wavelength was 532 nm. The determined samples were bird＇s nest material,and bird＇s nest after soaking and stewing. RESULTS： The range of nitrite content in 48 batches of edible bird＇s nest was 0-6 429. 58 mg/kg. And the content of edible bird＇s nest in 6 samples were 30 mg/kg,accorded with the Letter from the Ministry of Health on the Temporary Management of the Limited Quantities of Nitrite in Edible Bird＇s Nest. For nitrite can be soluble in water,after soaking and stewing,nitrite can be removed efficaciously,with average removal rate of 90% and the maximum can attain 97%. After soaking and stewing,nitrite could not been detected in samples. CONCLUSIONS： Nitrite was found in 48 batches of edible bird＇s nest,the average content of nitrite from highness go to lowliness in turn were respectively white bird＇s nest yellow bird＇s nest blood bird＇s nest. After soaking and stewing,nitrite can be removed,and the content of nitrite is lower than that of the average determined level.