Quantitative Determination of Lactic and Succinic Acids in Frozen Whole Eggs by Gas‐Liquid Chromatography

摘要

SUMMARY—Frozen whole egg containing known amounts of lactic and succinic acids were evaluated using gas‐liquid chromatography (GLC) and AOAC (1960) procedures. The acids were isolated from the whole egg samples by liquid‐liquid extraction, evaporated to dryness, and refluxed for 2 hr with 1‐butanol and HCI and chromatographed as their butyl ester derivatives, along with an internal standard. Peak heights and responses relative to butyl decanoate as an internal standard were used to calculate acid concentrations in the whole egg samples.Lactic acid recovered from whole egg samples by GLC procedures ranged from 98 at the low concentration (0.43 mg/100 g egg) to 99 at the high concentration (47.70 mg/100 g egg). Succinic acid recovered from whole egg samples by GLC procedures ranged from 103 at the low concentration (1.22 mg/100 g egg) to 98 at the high concentration (73.20 mg/100 g egg). Acid recoveries from whole egg samples by GLC procedures were as accurate, and generally less variable, than those recovered by AOAC (1960) pro