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Biochemical Characterization of Industrially Produced Rapeseed Meal as a Protein Source in Food Industry

Ivanova, Petya, Chalova, Vesela, Uzunova, Galina, Koleva, Lidia, Manolov, Ivan
Agriculture and Agricultural Science Procedia 2016 v.10 pp. 55-62
albumins, amino acid composition, byproducts, feed industry, food industry, globulins, glucosinolates, glutelins, in vitro digestibility, isoleucine, leucine, lipids, lysine, oils, pancreatin, pepsin, phenols, protein sources, proteolysis, rapeseed meal, sulfur, valine
Rapeseed meal is a by-product of oil production which is primarily used in feed industry. The application of the rapeseed meal as a protein source in food industry is an alternative which leads to a better and more complete use of this by-product. Biochemical characteristics of industrially produced rapeseed meal vary and therefore, detailed analyses prior to its use as a protein source is necessary. The commercial rapeseed meal evaluated in this study contained high protein amount (39.86%) and low residual total fats (2.30%). It was characterized with low levels of glucosinolates (12.69 ± 0.18μmol/g) and phenols (1.13 ± 0.04%). Amino acid analysis revealed lysine as the first limiting amino acid with an amino acid score of 58.00%, followed by valine (66.86%). However, this by-product was rich in leucine and isoleucine which amino acid scores equaled to 97.60 and 88.67% respectively. The amino acid score evaluation demonstrated relatively high amount of sulphur containing amino acids (82.57%). The commercial rapeseed meal exhibited low in vitro digestibility (18.59 ± 0.98%). The albumin, globulin and glutelin fractions however, expressed higher digestibility with albumin fraction being the most susceptible (67.22 ± 1.28%) to pepsin and pancreatin proteolytic activities.