| Effects of hot air and freeze drying methods on antioxidant activity, colour and some nutritional characteristics of strawberry tree (Arbutus unedo L) fruit. | |
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MedLine Citation:
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PMID: 22522307 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Antioxidant activity, colour and some nutritional properties of hot air and freeze-dried strawberry tree (Arbutus unedo L.) fruits were investigated. Additionally, the effects of two pre-treatments, namely ethyl oleate and water blanching, were compared in terms of drying characteristics. For determination of antioxidant activities in ethanol extracts, two different analytical methods were used: 1,1-diphenyl-2-picrylhydrazyl scavenging activity and β-carotene bleaching activity. As a result, the ethyl oleate pre-treatment shortened the drying time by hot air method and gave a higher 1,1-diphenyl-2-picrylhydrazyl scavenging activity (82.16 ± 0.34%), total phenolic content (7.62 ± 1.09 µg GAE/g extract), ascorbic acid content (236.93 ± 20.14 mg/100 g), besides hydromethylfurfural was not observed. Freeze-dried fruits exhibited higher ascorbic acid content (368.63 ± 17.16 mg/100 g) than those fresh fruits (231.33 ± 19.51 mg/100 g) and nearly 1,1-diphenyl-2-picrylhydrazyl activity (93.52 ± 0.41 %) to fresh fruits (94.03 ± 1.18%). Colour characteristics, sugar content and mineral contents of fruits were significantly affected by pre-treatments and drying methods (p < 0.05). It is concluded that the drying of strawberry tree fruits should bring a valuable and attractive foodstuff to food industry due to the rich nutritional components, antioxidant activity and colour. Another conclusion from this study is that the freeze-drying is the best drying method to keep the nutritional value, antioxidant activity and sensory properties of fruits. |
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Authors:
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H H Orak; T Aktas; H Yagar; S Selen Isbilir; N Ekinci; F Hasturk Sahin |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-4-20 |
Journal Detail:
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Title: Food science and technology international = Ciencia y tecnologia de los alimentos internacional Volume: - ISSN: 1082-0132 ISO Abbreviation: - Publication Date: 2012 Apr |
Date Detail:
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Created Date: 2012-4-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9889534 Medline TA: Food Sci Technol Int Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Food Technology, Vocational School of Technical Sciences, Namık Kemal University in Tekirdag, Turkey. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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