کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8415341 | 1545520 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of UV-Vis processing on enzymatic activity and the physicochemical properties of peach juices from different varieties
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش تغذیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This work evaluated the effect of ultraviolet and visible light (UV-Vis) processing on the enzymatic activity (polyphenol oxidase and peroxidase) and physicochemical characteristics (pH, °Brix, acidity, formol index, phenolics, ascorbic acid, sugars and colour) of peach juices from three different varieties (Baby Gold, Calanda and Planet Top). Irradiation was performed for 120â¯min, at 25 and 45â¯Â°C, using a multi-wavelength emission lamp which provided a radiation power of 4.49â¯Â·â¯10â2â¯W·cmâ2 at the liquid surface. After the treatments, no significant changes were observed in the pH value, acidity, vitamin C content, sugar content, or lightness. The phenolic content was reduced for the Planet Top juices, while the formol index decreased for the Calanda variety. a* and b* CIELab parameters decreased with processing time, contrary to that reported for thermal treatments. In most cases, UV-Vis irradiation was effective at inactivating polyphenol oxidase (PPO) and peroxidase (POD), although sometimes an initial activation was observed. The inactivation stage was described by a first-order model. At 45â¯Â°C, PPO was almost totally inactivated for the three juices studied, while reductions in POD of up to 60% were registered. Further experiments are suggested to improve the effectiveness of this technology for inactivating enzymes in peach juices.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Innovative Food Science & Emerging Technologies - Volume 48, August 2018, Pages 83-89
Journal: Innovative Food Science & Emerging Technologies - Volume 48, August 2018, Pages 83-89
نویسندگان
Karla Aguilar, Alfonso GarvÃn, Albert Ibarz,