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Maoberry (Antidesma bunius L.) is a tropical fruit locally referred to as "Mao-Luang" in Thailand. The fruit contains high amounts of ascorbic acid and phenolic compounds with antioxidative potential, which has demonstrated medicinal value in terms of anti-cancer and anti-diabetic effects. In this term, this research purposed to determine the changes of predominant bioactive phytochemicals, antioxidant capacity and microbiological quality of pasteurized (85°C/1 min), pressurized (500 and 600 MPa/30°C/30 min), and ultra-sonicated (20 kHz/60% and 80% amplitude/30 min) maoberry juices during storageat 4°C for 30 days. The results displayed that ascorbic acid, phenolic acids (gallic and vanillic acids), anthocyanins (cyanidin 3-o-glucoside and cyanidin 3-rutinoside), flavonoids [(+)-catechin and (?)-epicatechin), 2,2-diphenyl-1-picryl hydrazyl hydrate (DPPH) radical inhibition and ferric reducing antioxidant power (FRAP) value in pressurized and ultra-sonicated juices displayed higher reduction rate during storage than those in pasteurized juice. Nevertheless, at the final stage of storage, both juicesstill contained higher levels of antioxidant compounds and properties than inthermally treated juice. All the treated samples were shown to reduce initial microbial load of fresh maoberry juice to a non-detectable amount, while maintaining their quality during prolonged refrigerated storage. [ABSTRACT FROM AUTHOR]

Characterisation and antioxidative scavenging activities of anthocyanins in plants of Burkina Faso. Nine anthocyanins were isolated from three plants and their structures elucidated using chemical, GC, MS and NMR methods. Adenium obesum flowers anthocyanins were identified as cyanidin 3-O-(4-O-α-l-rhamnosyl)-β-d-galactopyranoside. The cyanidin 3-O-β-d-glucopyranoside, the cyanidin 3-O-(6-O-α-l-rhamnopyranosyl)-β-d-glucopyranoside, the pelargonidin 3-O-β-d-glucopyranoside and the pelargonidine 3-O-(6-O-α-l-rhamnopyranosyl)-β-d-glucopyranoside were isolated and identified from the flowers of Jatropha integuerrima. From flower chalices of H. sabdariffa, four compounds were established as cyanidin 3-O-β-d-glucopyranoside, cyanidin 3-O-(2-O-β-d-xylopyranosyl)-β-d-glucopyranoside, delphinidin 3-O-β-d-glucopyranoside and delphinidin 3-O-(2-O-β-d-xylopyranosyl)-β-d-glucopyranoside. The DPPH assay allowed us to determine that the antioxidative activities of the crude extract of H. sabdariffa and the Cyanidin 3-O-β-d-glucopyranoside of J. integuerrima were similar to those of ascorbic acid used as reference. To cite this article: É. Palé et al., C. R. Chimie 7 (2004). [Copyright &y& Elsevier]