Antioxidant Tannins from Stem Bark and Fine Root of Casuarina equisetifolia.
Summary of "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.
Affiliation
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China. linym@xmu.edu.cn.
Journal Details
This article was published in the following journal.
Name: Molecules (Basel, Switzerland)
ISSN: 1420-3049
Pages: 5658-70
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20714319
- DOI: http://dx.doi.org/10.3390/molecules15085658
Medical and Biotech [MESH] Definitions
Hypocotyl
The region of the stem beneath the stalks of the seed leaves (cotyledons) and directly above the young root of the embryo plant. It grows rapidly in seedlings showing epigeal germination and lifts the cotyledons above the soil surface. In this region (the transition zone) the arrangement of vascular bundles in the root changes to that of the stem. (From Concise Dictionary of Biology, 1990)
Syringa
A plant genus of the family OLEACEAE. Oleuropein has been identified in the stem bark.
Spices
The dried seeds, bark, root, stems, buds, leaves, or fruit of aromatic plants used to season food.
Tannins
Polyphenolic compounds with molecular weights of around 500-3000 daltons and containing enough hydroxyl groups (1-2 per 100 MW) for effective cross linking of other compounds (ASTRINGENTS). The two main types are HYDROLYZABLE TANNINS and CONDENSED TANNINS. Historically, the term has applied to many compounds and plant extracts able to render skin COLLAGEN impervious to degradation. The word tannin derives from the Celtic word for OAK TREE which was used for leather processing.
Biopsy, Fine-needle
Using fine needles (finer than 22-gauge) to remove tissue or fluid specimens from the living body for examination in the pathology laboratory and for disease diagnosis.
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