rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Fractionation of phenolic compounds from a purple corn extract and evaluation of antioxidant and antimutagenic activities
  name:
    name part: Pedreschi Plasencia, Romina, 1978-
    role:
      role term: creator
  name:
    name part: Cisneros-Zevallos, Luis
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2005
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: electronic
    form: remote
  abstract: Qualitative and quantitative analysis of anthocyanins and other phenolic compounds from a purple corn extract was performed. The purple corn extract had cyanidin-3-glucoside, pelargonidin-3-glucoside, peonidin-3-glucoside and its respective acylated anthocyanin-glucosides. Cyadinin-3glucoside was the main constituent (44.4 ± 4.7%) followed by the acylated cyanidin-3-glucoside (26.9 ± 8.0%). Other phenolic compounds present in the purple corn corresponded to protocatechuic acid, vanillic acid,and p-coumaric acid. In addition, quercetin derivatives, a hesperitin derivative and p-coumaric and ferulic acid derivatives were found. Fractionation of phenolic compounds yielded two main fractions, an anthocyanin-rich water fraction (WF) and an ethyl acetate fraction (EAF). Evaluation of antimutagenic activity in both fractions revealed higher antimutagenic activity in the ethyl acetate fraction compared to the anthocyanin-rich fraction. On the other hand, antioxidant activity of the anthocyanin-rich fraction was higher compared to the ethylacetate fraction. Further fractionation of the anthocyanin-rich fraction in a Toyopearl HW40 gel permeation column yielded five sub-fractions which showed no difference in antimutagenic activity except for the water sub-fraction WF-V. All the sub-fractions were active as antimutagens and antioxidants. Further fractionation of the ethyl acetate fraction yielded four sub-fractions that showed to be active as antimutagens and antioxidants. Ethyl acetate sub-fraction EAF-IV was the most active as an antimutagen. HPLC-DAD characterization of that sub-fraction revealed mainly the presence of a quercetin derivative with UV-visible spectral characteristics similar to rutin but with a little longer retention time. The mechanism of antimutagenic action by the phenolic compounds present either in the anthocyanin-rich fraction or the ethyl acetate fraction and sub-fraction EAF-IV seems to be a contribution of a direct action on the enzymes involved in…
  note: by Romina Pedreschi Plasencia.
  note: "Major Subject: Food Science and Technology"
  note: Title from author supplied metadata (automated record created on Sep. 21, 2005.)
  note: Vita.
  note: Abstract.
  note: Electronic resource.
  note: Mode of access: World Wide Web.
  note: System requirements: World Wide Web access and Adobe Acrobat Reader.
  note: M. S. Texas A&M University 2005.
  note: Includes bibliographical references.
  note: Text (Thesis).
  subject:
    topic: Major food science and technology
  subject:
    topic: antimutagenic activity
  subject:
    topic: purple corn extract
  identifier: http://hdl.handle.net/1969.1/2343
  record info:
    record content source: TXA
    record creation date: 051024
    record change date: 20151102142050.0
    record identifier: in00002097850