期刊
PROCESS BIOCHEMISTRY
卷 47, 期 12, 页码 2356-2364出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2012.09.016
关键词
Tyrosol; Phenolic acid; Antioxidant; Response surface methodology; ABTS assay; Oxidative stress
资金
- Ministry of Higher Education, Scientific Research in Tunisia
New tyrosyl ester derivative, a naturally occurring phenol with interesting biological properties, has been synthesized in good yield by a direct esterification of tyrosol (Ty) with p-hydroxyphenylacetic acid (p-HPA) using Candida antarctica lipase as a catalyst. The response surface methodology was used to modulate the effects of the enzyme amount (10-50 mg), the tert-butanol/hexane (v/v) ratio (0.16-0.84), the temperature (35-55 degrees C) and the reaction time (15-45 h) on the tyrosyl hydroxyphenylacetate (Ty-HPA) conversion yield. Under the optimal predicted conditions (enzyme amount: 10 mg, solvents volume ratio 0.16, reaction temperature; 45 degrees C and 34 h of incubation), a high conversion yield of 79.33 +/- 4% was reached. The obtained ester was purified and characterized by NMR, LC/MS and FT-IR methods. ABTS free radical quenching potency demonstrated that the esterified tyrosol (Ty-HPA) was more effective than the natural separated antioxidants: Ty and p-HPA. Furthermore, when used at a non-cytotoxic concentration (100 mu M), tyrosyl ester showed significant effectiveness in preventing iron-induced oxidative stress in blood cells compared to the two separated compounds. The antibacterial activity of Ty, p-HPA, mixed solution of Ty + p-HPA and Ty-HPA was performed by determining the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) using a micro-well dilution method. Compared to the separated substrates, synthesized ester exhibits the most antibacterial effect mainly against Gram+ bacteria. (C) 2012 Elsevier Ltd. All rights reserved.
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