Extraction of light filth from oriental sauces containing soy sauce, thickeners, and spices: collaborative study

Results are reported for a collaborative study of a method for the extraction of light filth from oriental sauces containing soy sauce, thickeners, and spices. A 100 g test portion is pretreated in a 2% solution of Tergitol Anionic 4 over a steam bath, and oils are removed by wet-sieving on No. 230 sieve. Filth is isolated from 40% isopropanol by using Na4EDTA and mineral oil. Average recoveries by 9 collaborators for 3 spike levels of rat hairs (5, 10, and 15) were 84, 78, and 79%, respectively; for insect fragments (5, 15, and 30), recoveries were 92, 95, and 96%, respectively. The method was adopted first action by AOAC International.