Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 61, Issue 28, Pages 6929-6936Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf4010143
Keywords
pressurized hot water extraction; grape pomace; Vitis vinifera; polyphenols; thermal degradation
Funding
- INNOVA-Chile [07CT9PDT-47]
- Conicyt [ACT1105]
- VRAI-PUC
- ISCIII [CD09/00068]
Ask authors/readers for more resources
Grape pomace was extracted with pressurized hot water at laboratory scale before and after fermentation to explore the effects of fermentation and extraction temperature (50-200 degrees C) and time (5 and 30 min) on total extracted antioxidant levels and activity and to determine the content and recovery efficiency of main grape polyphenols, anthocyanins, and tannins. Fermented pomace yielded more total antioxidants (TAs), antioxidant activity, and tannins, than unfermented pomace but fewer anthocyanins. Elevating the extraction temperature increased TA extraction and antioxidant activity. Maximum anthocyanin extraction yields were achieved at 100 degrees C and at 150 degrees C for tannins and tannin anthocyanin adducts. Using higher temperatures and longer extraction times resulted in a sharp decrease of polyphenol extraction yield. Relevant proanthocyanidin amounts were extracted only at 50 and 100 degrees C. Finally, TA recovery and activity were not directly related to the main polyphenol content when performing pressurized hot water grape pomace extraction.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available