title: Size effect of se-enriched green tea particles on in vitro antioxidant and antitumor activities.
abstract: The antioxidant and antitumor activities (in vitro) of superfine regular and Se-enriched green tea particles with different sizes (3.52 microm and 220 nm) were investigated in this paper. The vitamin C and tea polyphenol contents of green tea in different sizes were significantly different, and amino acid and chlorophyll just changed a little. The antioxidant activity of green tea particles was evaluated by DPPH radical scavenging and linoleic acid peroxidation inhibition methods, and the antitumor activity was evaluated by antiproliferation assay on HepG2, A549, and MGC803 cells. The results indicated that enrichment of selenium endowed green tea with higher antioxidant activity and antitumor activity on HepG2 and A549 cells but not on MGC803 cells. The DPPH radical scavenging rates of regular and Se-enriched green tea of 220 nm (67.87% and 69.49%, respectively) were significantly greater than that of 3.52 microm, but the inhibition of linoleic acid peroxidation for green tea of 220 nm was lower. The inhibitory rates of green tea of 220 nm on HepG2, A549, and MGC803 cells achieved 77.35%, 80.76%, and 87.54% for regular green tea, and 82.51%, 88.09%, and 74.48% for Se-enriched green tea at the dose of 100 microg mL (-1), values that were all significantly higher compared to that of 3.52 microm.
authors.affiliation: College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China.
authors.forename: Huajia
authors.initials: H
authors.lastname: Li
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Fangmei
authors.initials: F
authors.lastname: Yang
authors.forename: Yong
authors.initials: Y
authors.lastname: Fang
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Xin
authors.forename: Liyan
authors.initials: L
authors.lastname: Zhao
authors.forename: Qiuhui
authors.initials: Q
authors.lastname: Hu
mesh_terms: D000970:Antineoplastic Agents / Q000032:analysis / Q000494:pharmacology*; D000975:Antioxidants / Q000032:analysis / Q000494:pharmacology*; D028241:Camellia sinensis / Q000737:chemistry* / Q000254:growth & development; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor; D006801:Humans; D010316:Particle Size; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry / Q000187:drug effects; D012643:Selenium / Q000008:administration & dosage*; D013662:Tea / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D000975:Antioxidants; D010936:Plant Extracts; D013662:Tea; D012643:Selenium