Bound phenolic acids were extracted according to Mattila,
Pihlava, and Hellström (2005) with slight modifications. The residue
remaining after anthocyanin extraction was mixed with
42 mL of a mixture of acidified methanol and 10% acetic acid
(85:15 v/v). The mixture was homogenized (Polytron PT3100,
Lucerne, Switzerland) at 10,000 rpm for 5 min and sonicated for
30 min. The volume was brought to 132 mL with deionized water.
Subsequently, 30 mL of 10 N NaOH was added, and the homogenate
was stirred for 24 h at 25 C and was adjusted to a pH of 2.
Bound phenolic compounds were extracted by adding a mixture
of cold diethyl ether and ethyl acetate (1:1) at an extract to solvent
ratio of 1:2. The extraction was performed 3 times, and the organic
layers were combined, evaporated to dryness under N2 gas and dissolved
in methanol before HPLC analyses for bound phenolic
compounds.
Bound phenolic acids were extracted according to Mattila,Pihlava, and Hellström (2005) with slight modifications. The residueremaining after anthocyanin extraction was mixed with42 mL of a mixture of acidified methanol and 10% acetic acid(85:15 v/v). The mixture was homogenized (Polytron PT3100,Lucerne, Switzerland) at 10,000 rpm for 5 min and sonicated for30 min. The volume was brought to 132 mL with deionized water.Subsequently, 30 mL of 10 N NaOH was added, and the homogenatewas stirred for 24 h at 25 C and was adjusted to a pH of 2.Bound phenolic compounds were extracted by adding a mixtureof cold diethyl ether and ethyl acetate (1:1) at an extract to solventratio of 1:2. The extraction was performed 3 times, and the organiclayers were combined, evaporated to dryness under N2 gas and dissolvedin methanol before HPLC analyses for bound phenoliccompounds.
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