Mineral Elements, Lipoxygenase Activity, and Antioxidant Capacity of Okara as a Byproduct in Hydrothermal Processing of Soy Milk
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2014
Authors
Stanojević, SlađanaBarać, Miroljub
Pešić, Mirjana
Vucelic-Radović, Biljana
Žilić, Slađana
Kresović, Mirjana M.
Article (Published version)
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Show full item recordAbstract
Minerals and antioxidative capacity of raw okara that was obtained as a byproduct from six soybean varieties during hydrothermal cooking (HTC) of soy milk were assessed. Lipoxygenase (Lox), an enzyme deteriorating the sensory characteristics of okara, was also investigated. All genotypes had very similar concentrations of Lox (4.32-5.62%). Compared to raw soybeans, the applied HTC significantly reduced Lox content in okara (0.54-0.19%) and lowered its activity to 0.004-0.007 mu mol g(-1) min(-1). Correlation between the content of Lox in soybeans and that in okara (r = 0.21;p lt 0.05) was not registered. This indicates that the content of this enzyme in okara depended much more on the technological process than on soybean genotype. Very strong correlation (r = 0.99; p lt 0.05) between okara Lox content and its activity was found. The most abundant minerals in raw okara were potassium (1.04-1.21 g/100g), phosphorus (0.45-0.50 g/100 g), calcium (0.26-0.39 g/100 g), and iron (5.45-10....95 mg/100 g). A very high antioxidant capacity (19.06-29.36 mmol Trolox kg(-1) contributes to the nutritional value of raw okara.
Keywords:
okara / HTC processing / soybean genotype / lipoxygenase / antioxidant capacity / mineral contentSource:
Journal of Agricultural and Food Chemistry, 2014, 62, 36, 9017-9023Publisher:
- Amer Chemical Soc, Washington
Funding / projects:
- Interdisciplinary Approach to Development of New Soybean Varieties and Improvement of the Cultivation Practices and Seed Production (RS-31022)
- Advancing research in agricultural and food sciences at Faculty of Agriculture, University of Belgrade (EU-316004)
DOI: 10.1021/jf501800s
ISSN: 0021-8561
PubMed: 25167333