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PubMed · 7228825

Extraction of light filth from tea: collaborative study.

F F Lim·J Barnett·A Bright·M P Chaput·C Cox·D M Floyd·J Gentry·J Thrasher·E C Washbon
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Abstract

The present AOAC method for determining insect and rodent filth in tea is time-consuming because it produced filter papers which are heavy in plant residue and therefore required long paper-reading times. A new method for the analysis of light filth in tea was developed to remedy existing problems and to improve recoveries. The method consists of the following steps: sample preparation, wet sieving, dilution with 40% isopropanol, flotation with mineral oil-heptane, and trapping off in a Wildman trap flask. In an interlaboratory collaborative study, analysts reported combined insect fragment recoveries of 99.2% for the proposed method and 93.0% for the AOAC method; the same analysts recorded combined rodent hair recoveries of 92.2% for the proposed method and 47.6% for the official method. Average times for reading individual subsamples were 9 min for the proposed method and 27 min for AOAC method. the proposed method has been adopted official first action.

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F F Lim, J Barnett, A Bright, M P Chaput, C Cox, D M Floyd, J Gentry, J Thrasher, E C Washbon. 1981. Extraction of light filth from tea: collaborative study.. https://pubmed.ncbi.nlm.nih.gov/7228825/

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