Antioxidant tannins from stem bark and fine root of Casuarina equisetifolia.
Structures of condensed tannins from the stem bark and fine root of Casuarina equisetifolia were identified using MALDI-TOF MS and HPLC analyses. The condensed tannins from stem bark and fine root consist predominantly of procyanidin combined with prodelphinidin and propelargonidin, and epicatechin is the main extension unit. The condensed tannins had different polymer chain lengths, varying from trimers to tridecamer for stem bark and to pentadecamer for fine root. The antioxidant activities were measured by two models: 1,1-diphenyl-2- picrylhydrazyl (DPPH) radical scavenging activity and ferric reducing/ antioxidant power (FRAP). The condensed tannins extracted from C. equisetifolia showed very good DPPH radical scavenging activity and ferric reducing/ antioxidant power, suggesting that these extracts may be considered as new sources of natural antioxidants for food and nutraceutical products.
Zhang
Shang-Ju
SJ
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen, China.
Lin
Yi-Ming
YM
Zhou
Hai-Chao
HC
Wei
Shu-Dong
SD
Lin
Guang-Hui
GH
Ye
Gong-Fu
GF
D000975:Antioxidants / Q000032:analysis* / Q000737:chemistry; D001713:Biphenyl Compounds / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D056148:Chromatography, Reverse-Phase; D003543:Cysteamine / Q000737:chemistry; D029962:Fagaceae / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D010636:Phenols / Q000032:analysis; D010851:Picrates / Q000737:chemistry; D024301:Plant Bark / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*; D044945:Proanthocyanidins / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013438:Sulfhydryl Compounds / Q000737:chemistry
D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D010636:Phenols; D010851:Picrates; D044945:Proanthocyanidins; D013438:Sulfhydryl Compounds; D003543:Cysteamine; C004931:1,1-diphenyl-2-picrylhydrazyl; D007501:Iron