Polycyanurate networks from anethole dimers: Synthesis and characterization

Novel biorenewable bisphenols are obtained through simple and rapid chemical transformation of the natural product trans‐anethole. The corresponding dicyanate esters are thermally cured to give polycyanurate networks. The thermal properties from differential scanning calorimetry, thermogravimetric, and dynamic thermomechanical analyses of the new dicyanate esters compare favorably with similar commercial products. © 2012 Wiley Periodicals, Inc.^? J Polym Sci Part A: Polym Chem, 2012     

Fe(acac)3-Al(i-Bu)3对马来酸酐与茴香脑共聚的催化性能

 研究了Fe（acac）3－Al（i－Bu）3（acac＝乙酰丙酮）催化体系对马来酸酐（MA）与茴香脑（ANE）共聚反应的催化性能．动力学研究结果表明,MA与ANE共聚对单体的浓度呈一级反应,其表观活化能为31．0kJ／mol．用IR和13CNMR研究了共聚物的结构,结果表明聚合物是交替的,其中酸酐的含量为45．6％．用GPC测定了聚合物的分子量及其分布,结果表明分子量的分布较窄,PDI＝1．19～1．42．用DTA研究了聚合物的热力学性质,其分解温度为501．1℃．     

The Antioxidant,Cytotoxic and Antimicrobial Potential of Phenolic Acids-Enriched Extract of Elicited Hairy Roots of Salvia bulleyana

Hairy root cultures are valuable sources of a range of phytochemicals. Among them, Salvia bulleyana root culture is a promising source of polyphenols, especially rosmarinic acid (RA), a phenolic acid depside with pleiotropic activity and a wide application in medicine and cosmetology. The aim of the study was to enhance the culture productivity by finding suitable elicitation protocol and to determine its biological potential in terms of antioxidant, anticancer and antimicrobial properties. The total content of phenols and the levels of particular constituents in root extracts were analyzed using HPLC-PDA. Among four elicitors tested (yeast extract; methyl jasmonate, MJA; trans-anethol; and cadmium chloride), MJA was found to be the most effective. The greatest boost in phenolic production (up to 124.4 mg/g dry weight) was observed after three-day treatment with MJA at 100 µM, with an almost 100% improvement compared to the controls (non-treated root culture). The hydromethanolic extract from the elicited culture exhibited strong antioxidant activity with IC₅₀ values of 11.1 µg/mL, 6.5 µg/mL and 69.5 µg/mL for DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS (2,2-azinobis-(3-ethylbenzthiazoline-6-sulfonic acid)) and superoxide anion radical, respectively. Moreover, in concentrations of 0.5–5 mg/mL the extract inhibited the growth of LoVo, AGS and HeLa cell lines, but was safe for the L929 cells up to the concentration of 5 mg/mL. The extract also exhibited moderate antimicrobial activity. Thus, the results confirmed that elicitation can be a beneficial strategy for increase the phenolic acid biosynthesis in hairy roots of S. bulleyana, and that such a highly productive culture can show significant biological potential.     

硫酸高铈氧化茴香脑合成茴香醛的反应动力学研究

茴香醛被广泛用于食品、香料、医药及电镀等工业中[1]。制备茴香醛是用对甲氧基甲苯作为原料氧化合成茴香醛,[2,3]但近年石油化工原料价格猛涨,因而以我国广西盛产的茴香油(含茴香脑)为原料制备茴香醛的方法得以重视[4-9]。用间接电氧化法氧化茴香脑(anethole)制备茴香醛(ani-s     

Ultramicrodetermination of Amino Acids and Histidyl-Peptides by Fluorescence Measurements of Spots on Paper

Abstract

A method was developed which ensures reproducibility of fluorescence of OPT histidine and histidyl-peptides, and other amino acid-ninhydrin-phenylacetaldehyde complexes absorbed on filter paper. A linear dependence of fluorescence was found in the range 2-400 ng for histidine and histidyl-peptides with the OPT reagent, and in the range 7-Z50 ng for glycine, phenylalanine, histidine and methionine, with the ninhydrin-phenylacetaldehyde reagent.