Differences in the Antioxidant Activities and Volatile Components of Toona sinensis from Different Regions
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Abstract:
The antioxidant activities and volatile composition of T. sinensis from different production places were analyzed and evaluated, to provide a reference for processing and industrial development of high-quality Toona sinensis products. The contents of total flavonoids，total polyphenols, total alkaloids，total saponins, total crude polysaccharides and soluble proteins as well as DPPH free radical scavenging activity and OH· free radical scavenging activity of T. sinensis, were determined by routine physical and chemical methods, and correlation analysis and principal component analysis (PCA) were also performed. The volatile components of T. sinensis were detected by headspace solid phase microextraction (SPME) and gas chromatography-mass spectrometry (GC-MS), and the main volatile components were evaluated using relative odor activity value (ROAV). Results showed that the changing trend of the contents of total flavonoids and total polyphenols in T. sinensis from the 12 different growing places was essentially the same, with the contents in those from Yunnan being the highest. The correlation coefficient between the content of total saponins and DPPH clearance rate was 0.475, and those between the content of total flavonoids or the content total polyphenols and OH· free radical scavenging rate, were 0.606 and 0.729, respectively, exhibiting a dose-effect relationship. These compounds were mainly the fundamental substances responsible for the antioxidant activity. A total of 229 volatile compounds were detected in T. sinensisfrom the 12 different places, with 59 found in those from Guizhou, 80 found in those from Yunnan, 73 found in those from Sichuan, 41 found in those from Guangxi, 84 found in those from Hunan, 73 found in those from Zhejiang, 54 found in those from Shanxi, 69 found in those from Anhui, 82 found in those from Hubei, 55 found in those from Henan, 52 found in those from Shandong, and 53 found in those from Hebei. 2-Hexenal, (E,Z)-2,6-nonadienal, hexanal, 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one and α-pinene were the main volatile compounds in the T. sinensis from different places. The antioxidant activity and volatile composition of the T. sinensis samples from different places had certain similarities and also large differences, and exhibited their own unique qualities and flavors.
