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https://hdl.handle.net/11499/7745
Title: | Changes in hydrolysable and condensed tannins of pomegranate (Punica granatum L., cv. Hicaznar) juices from sacs and whole fruits during production and their relation with antioxidant activity | Authors: | Muhacir-Güzel, N. Türkyilmaz, M. Yemiş, Oktay Tagi, T. Özkan, M. |
Keywords: | Cold clarification Ellagic acid Pasteurization Punicalagin Yield Clarifiers Flavonoids Fruits Tannins Antioxidants Anti-oxidant activities Condensed tannins Polyphenol content Pomegranate juices Punica granatum Strong correlation Plants (botany) Lythraceae |
Publisher: | Academic Press | Abstract: | The effects of clarification and pasteurization on hydrolysable tannins (HTs), condensed tannins (CTs) and antioxidant activities of pomegranate juices extracted from whole fruits and sacs were investigated. Tannin contents (53-85%) and antioxidant activities (18%) in juice from whole fruits (JFWF) were found higher than those in juice from sacs (JFS). In both juice samples, clarification led to significant decreases (15-74%) in total polyphenol, HT and CT contents as well as antioxidant activities, whereas pasteurization (1-52%) led to the increases, except for the CT contents. Similar to pasteurization, HT contents also increased (r = 0.956) as the pressure and time increased during pressing. Punicalin, ?-punicalagin, ß-punicalagin and ellagic acid hexoside were the major HTs in pomegranate juices. Among HTs, ellagic acid hexoside was the major HT in JFWF, whereas ß-punicalagin was the major one in JFS. ß-punicalagin was the most susceptible HT to clarification. Strong correlations were found between antioxidant activity values with total polyphenol contents (r = 0.824-0.926), and total HTs contents (r = 0.775-0.994) and CT contents (r = 0.592-0.956). Antioxidant activity of JFWF resulted mainly from HTs (r = 0.994), while that of JFS resulted mainly from CTs (r = 0.956). © 2014 Elsevier Ltd. | URI: | https://hdl.handle.net/11499/7745 https://doi.org/10.1016/j.lwt.2014.07.025 |
ISSN: | 0023-6438 |
Appears in Collections: | Mühendislik Fakültesi Koleksiyonu Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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