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Updated: Sep 21, 2026

A Generalized Method for Determining Free Soluble Phenolic Acid Composition and Antioxidant Capacity of Cereals and Legumes
Published on: June 10, 2022
Identification of the phenolic substances in bovine urine associated with oak leaf poisoning
1Department of Agriculture and Animal Husbandry of Shaanxi Province, Xi'an, People's Republic of China.
Abstract:
Six phenolic substances in bovine urine associated with oak leaf poisoning were identified by means of the ferric chloride reaction, paper chromatography and gas-liquid chromatography. The results indicate that these are neither oak tannin nor tannic acid but small molecular weight phenolic compounds. The concentration of free volatile phenols in the urine of cattle affected by oak leaves (n = 9, 26.57 +/- 11.20 mg litre-1) was significantly higher than in normal cattle (n = 9, 2.59 +/- 0.03 mg litre-1).

