Premium
Changes in Anthocyanins and Polyphenolics During Juice Processing of Highbush Blueberries ( Vaccinium corymbosum L.)
Author(s) -
Skrede G.,
Wrolstad R.E.,
Durst R.W.
Publication year - 2000
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.2000.tb16007.x
Subject(s) - vaccinium , anthocyanin , chemistry , polyphenol , chlorogenic acid , food science , proanthocyanidin , delphinidin , malvidin , glycoside , cyanidin , berry , bilberry , botany , biochemistry , biology , organic chemistry , antioxidant
Frozen blueberries ( Vaccinium corymbosum L.) were processed into juice and concentrate, and the changes in anthocyanin pigments and polyphenolics (cinnamates, procyanidins, flavonol glycosides) were monitored. While juice yield was 83%, only 32% of the anthocyanins were recovered in single‐strength juice. Flavonol, procyanidin and chlorogenic acid recoveries in juice were 35%, 43%, and 53%, respectively. The proportion of polyphenolics remaining in the press‐cake residue ranged from 1% (chlorogenic acid) to 18% (anthocyanins). Pronounced losses of anthocyanins and polyphenolics during milling and depectinization are believed to be due to native polyphenol oxidase. Losses during concentration ranged from 1.5% (anthocyanins) to 20% (procyanidins). Striking changes occurred in the anthocyanin profile with malvidin glycosides being most stable and delphinidin glycosides the least.