𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Chemical Constituents from the Bark of Garcinia xanthochymus and Their 1,1-Diphenyl-2-picrylhydrazyl (DPPH) Radical-Scavenging Activities

✍ Scribed by Fang-Fang Zhong; Yu Chen; Guang-Zhong Yang

Publisher
John Wiley and Sons
Year
2008
Tongue
German
Weight
190 KB
Volume
91
Category
Article
ISSN
0018-019X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A new bis‐xanthone (xanthone=9__H__‐xanthen‐9‐one), named bigarcinenone A (1) which is the first example of a bis‐xanthone with the xanthone–xanthone linkage between an aromatic C‐atom and a C~5~ side chain from a guttiferae plant, a new phloroglucinol (=benzene‐1,3,5‐triol) derivative, named garcinenone F (2), together with seven known xanthones were isolated from the bark of Garcinia xanthochymus. Their structures were elucidated by spectroscopic methods, especially 2D‐NMR techniques. Bigarcinenone A (1) exhibited potent antioxidant activity in the 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH) radical‐scavenging test with a IC~50~ value of 9.2 μM, compared to the positive control, the well‐known antioxidant butylated hydroxytoluene (BHT) with a IC~50~ of 20 μM (Table 3).

📜 SIMILAR VOLUMES

ChemInform Abstract: Xanthones from the
ChemInform Abstract: Xanthones from the Bark of Garcinia xanthochymus and Their 1,1-Diphenyl-2-picrylhydrazyl Radical-Scavenging Activity.
✍ Fangfang Zhong; Yu Chen; Ping Wang; Huijin Feng; Guangzhong Yang 📂 Article 📅 2009 🏛 John Wiley and Sons ⚖ 21 KB 👁 2 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v

DPPH (= 2,2-Diphenyl-1-picrylhydrazyl) R
DPPH (= 2,2-Diphenyl-1-picrylhydrazyl) Radical-Scavenging Reaction of Protocatechuic Acid (= 3,4-Dihydroxybenzoic Acid): Difference in Reactivity between Acids and Their Esters
✍ Shizuka Saito; Jun Kawabata 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 German ⚖ 142 KB

Protocatechuic acid (= 3,4-dihydroxybenzoic acid; 1) exhibits a significantly slow DPPH (= 2,2diphenyl-1-picrylhydrazyl) radical-scavenging reaction compared to its esters in alcoholic solvents. The present study is aimed at the elucidation of the difference between the radical-scavenging mechanisms