title: Absorption rates and free radical scavenging values of vitamin C-lipid metabolites in human lymphoblastic cells.
abstract: BACKGROUND
  In this study we investigated the cellular absorption rates, antioxidant and free radical scavenging activity of vitamin C-lipid metabolites. The absorption was measured in a human lymphoblastic cell line using a spectrophotometric technique.
  
  
  METHODS
  Cellular vitamin C levels in the human lymphoblastic H9 cell line were measured using the 2,4-dinitrophenylhydrazine spectrophotometric technique. Free radical scavenging activity of vitamin C-lipid metabolites was measured by the reduction of 1,1-diphenyl-2-picryl hydrazyl (DPPH) to 1,1-diphenyl-2-picryl hydrazine. Vitamin C-lipid metabolite scavenging of peroxyl radical oxygen reactive species (ORAC) was determined by fluorescence spectrophotometry.
  
  
  RESULTS
  Compared to ascorbic acid (AA), calcium ascorbate (CaA), and calcium ascorbate-calcium threonate-dehydroascorbate (Ester-C), vitamin C-lipid metabolites (PureWay-C) were more rapidly absorbed by the H9 human T-lymphocytes. The vitamin C-lipid metabolites (PureWay-C) also reduced pesticide-induced T-lymphocyte aggregation by 84%, while calcium ascorbate-calcium threonate-dehydroascorbate (Ester-C) reduced aggregation by only 34%. The vitamin C-lipid metabolites (PureWay-C) demonstrated free radical scavenging activity of nearly 100% reduction of DPPH at 20 microg/ml and oxygen radical scavenging of over 1200 micro Trolox equivalents per gram.
  
  
  CONCLUSIONS
  These data demonstrate that the vitamin C-lipid metabolites (PureWay-C) are more rapidly taken-up and absorbed by cells than other forms of vitamin C, including Ester-C. This increased rate of absorption correlates with an increased protection of the T-lymphocytes from pesticide toxicities. Further, vitamin C-lipid metabolites (PureWay-C) are a potent antioxidant and have significant free radical scavenging capabilities.
authors: Department of Biology and Environmental Sciences Program, Adelphi University, Garden City, NY, USA.
authors: Benjamin S
authors: BS
authors: Weeks
authors: Pedro P
authors: PP
authors: Perez
mesh_terms: D000042:Absorption; D000975:Antioxidants / Q000378:metabolism; D001205:Ascorbic Acid / Q000378:metabolism*; D002460:Cell Line; D004032:Diet; D016166:Free Radical Scavengers / Q000378:metabolism*; D006801:Humans; D050356:Lipid Metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013601:T-Lymphocytes / Q000378:metabolism*; D015262:Xenobiotics / Q000378:metabolism
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D017382:Reactive Oxygen Species; D015262:Xenobiotics; D001205:Ascorbic Acid