Reference

Phenolic components with biological activity in vegetable extracts

Phenolic components with biological activity in vegetable extracts. Beschia, Magda; Leonte, Alexandrina; Oancea, Ioana (Univ. Galati, Rom.). Bul. Univ. Galati, Fasc. 6, 5, 59-63 (English) 1982. CODEN: BGFADF. DOCUMENT TYPE: Journal CA Section: 17 (Food and Feed Chemistry) Exts. from the stinging nettle (Urtica dioica) and the smoke tree (Continus coggygrya) were inhibitory toward several species of yeast, molds, and bacteria important in food spoilage. The inhibitory activity was due to the phenols (caffeic acid [331-39-5], ferulic acid [1135-24-6], sinapic acid [530-59-6], and esculetin [305-01-1] in the nettle and fisetin [528-48-3], quercetin [117-39-5], myricetin [529-44-2], and dihydrofisetin [20725-03-5] in the smoke tree) in the exts.

Effect of phenolic monomers on ruminal bacteria

Effect of phenolic monomers on ruminal bacteria. Borneman, W. S.; Akin, D. E.; VanEseltine, W. P. (Richard B. Russell Agric. Res. Cent., Agric. Res. Serv., Athens, GA 30613, USA). Appl. Environ. Microbiol., 52(6), 1331-9 (English) 1986. CODEN: AEMIDF. ISSN: 0099-2240. DOCUMENT TYPE: Journal CA Section: 4 (Toxicology) Section cross-reference(s): 10 Ruminal bacteria were subjected to a series of phenolic compds. in various concns. to acquire fundamental information on the influence on growth and the potential limits to forage utilization by phenolic monomers. Ruminococcus albus 7, R. falvefaciens FD-1, Butyrivibria fibrisolvens 49 and Lachnospira multiparus D-32 were tested against 1, 5, and 10 mM concns. of sinapic acid [530-59-6], syringaldehyde [134-96-3], syringic acid [530-57-4], ferulic acid [1135-24-6], vanillin [121-33-5], vanillic acid [121-34-6], P-coumaric acid [7400-08-0], p-hydroxybenzaldehyde [123-08-0], p-hydroxybenzoic acid [99-96-7], and hydrocinnamic acid [501-52-0]. Responses were variable and dependent on the phenolic compd. and microbial species. Compds. esp. toxic (i.e., resulting in poor growth, effect on several species, dose-related response) were p-coumaric acid and p-hydroxybenzaldehyde, and adaptation to the toxins did not occur after 3 24-h periods. Syringic, p-hydroxybenzoic, and hydrocinnamic acids stimulated growth of all 4 species and also stimulated filter paper degrdn. by R. flavefaciens. None of the stimulatory compds. supported microbial growth in the absence of carbohydrates. In vitro dry matter digestibility of cellulose [9004-34-6] (Solkda-floc) was not stimulated by any of the phenolic compds. (10 mM), but the cinnamic acids and benzoic aldehydes (10 mM) reduced digestion by the mixed population in ruminal fluid. Growth of R. flavefaciens in the presence of p-hydroxybenzoic acid (10 mM) or p-coumaric acid (5 mM) resulted in recognizable alterations in cell ultrastructure. Both phenolics caused a redn. in cell size, and p-coumaric acid caused a redn. in capsular size and produced occasional pleomorphic cells.