New Zealand Journal of Crop and Horticultural Science abstracts

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Short communication
Changes in antioxidant activity in Rosa rugosa flowers at different stages of development

Z. Youwei

College of Life Science
Guangdong Key Lab of Biotechnology for Plant Development
South China Normal University
Guangzhou 510631, Guangdong
Peoples’ Republic of China
and Department of Food and Bio-engineering
Guangdong Light Industry Technical College
Guangzhou 510300, Guangdong
Peoples’ Republic of China

P. Yonghong*

College of Life Science
Guangdong Key Lab of Biotechnology for Plant Development
South China Normal University
Guangzhou 510631, Guangdong
Peoples’ Republic of China
and Department of Life Science
Huizhou University
Huizhou 516007, Guangdong
Peoples’ Republic of China
email: pengyh@scnu.edu.cn

Abstract Free radical scavenging activities (FRSA) of the crude aqueous extracts from Rosa rugosa fresh flowers at different developmental stages on 1,1-diphenyl-2-picrylhydrazyl (DPPH), superoxide and hydroxyl free radicals, and their polyphenolic concentration, were investigated. FRSA ranged from 73.5% to 40.2% for DPPH, from 32.2% to 14.3% for hydroxyl, and from 84.6% to 78.0% for superoxide. The polyphenolic concentration varied from 19.8 to 6.9 mg catechin equivalents (CE)/g fresh weight (FW). There was a reduction in FRSA for DPPH and hydroxyl, as well as polyphenolic concentration. The decrease in polyphenolic concentration was positively correlated with declines in free radical scavenging of DPPH (r² = 0.961, P < 0.01) and hydroxyl free radicals (r² = 0.993, P < 0.01). These results demonstrated a close link between rose development, polyphenolic concentration, and antioxidant activity with stage 1 exhibiting the best polyphenolic concentration and free radical scavenging potential.

Keywords Rosa rugosa; free radical scavenging activity; developmental stage; polyphenolic concentration

New Zealand Journal of Crop and Horticultural Science, 2007, Vol. 35: 397–401
0014–0671/07/3504–0397 © The Royal Society of New Zealand 2007
*Author for correspondence. H06119; Online publication date 26 October 2007. Received 20 December 2006; accepted 7 June 2007

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