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Title:
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Extraction of anthocyanins and flavan-3-ols from red grape pomace continuously by coupling hot water extraction with a modified expeller.
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Author:
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Monrad, Jeana K.; Suárez, Manuel; Motilva Casado, Mª José; King, Jerry W.; Srinivas, Keerthi; Howard, Luke R.
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Notes:
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A continuous aqueous-based extraction systemwas developed to extract anthocyanins and flavan-3-ols from red grape pomace. The system consisted of a modified midget expeller with multiple water injection ports which allowed the introduction of hot water into the expeller barrel. Variables tested were flow rate, water pre-bath temperature, expeller shaft temperature, shaft rotation speed, and sample moisture content (dried or crude). Compared to values obtained using conventional extraction, 41% of monomeric anthocyanins and 27% of total flavan-3-ols were extracted in dried samples under optimal conditions while 68% of monomeric anthocyanins and 58% of total flavan-3-ols were extracted in crude samples that were not dried. Antioxidant activity (ORAC assay) values of extracts from dried and crude pomace obtained under optimal conditions were 38 and 58%, respectively, compared to conventional extraction methods. However, high recoveries of the physiologicallyactive monomers catechin (145%) and epicatechin (104%) were recorded in crude extracts, compared with conventional organic solvent extraction. The described process offers an environmentally-compatible method for realizing a value-added product from the pomace waste stream that can be used as an antioxidant additive in food and nutraceutical formulations. |
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Subject(s):
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-anthocyanins
-flavan-3-ols
-red grape pomace
-phenol extraction
-Fenols
-Antocianines
-Sucs de fruita
-Most
-Phenols
-Anthocyanins
-Fruit juices
-Raïms |
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Rights:
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(c) Elsevier, 2014
info:eu-repo/semantics/restrictedAccess |
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Document type:
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Article
Article - Published version |
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Published by:
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Elsevier
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