Food Technology
Behdad Shokrollahi; Mohammad Ali Hesarinejad; Zahra Zamani; Negin Yousofi; Anna Abdolshahi; Ashkan Jebelli
Abstract
Introduction: Due to increasing the demand for new sources of protein and the lack of animal protein sources, using and replacing of plant proteins is widely considered. The purpose of this study was to identify the potential of Vicia villosa flour as a native and novel source of protein. In this research, ...
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Introduction: Due to increasing the demand for new sources of protein and the lack of animal protein sources, using and replacing of plant proteins is widely considered. The purpose of this study was to identify the potential of Vicia villosa flour as a native and novel source of protein. In this research, the physical properties of vicia villosa seed and chemical composition (protein, fat, ash, and carbohydrate and moisture contents) and color parameters of its full fat flour were determined and compared with defatted flour as well as the effect of defatting and pH on the functional properties of full fat and defatted vicia villosa flour were investigated. Materials and methods: Vicia Villosa seed was obtained from the local market in Chaharmahal and Bakhtiari province and was cleaned, skinned and, milled. Half of the full fat flour was defatted. The obtained flours were then refrigerated at 4°C for further analysis. Physical properties of the seed including size, dimension, mass, true and bulk density as well as porosity were measured using standard methods and calibrated equipments. Chemical composition of both the seed and skinned seed’s flour (moisture content, fat, protein and ash) were determined using standard methods (AACC, 2003). The carbohydrate content of the samples was determined by subtraction of the sum of other compositional substances from 100. Color properties, protein solubility, water soluble index, water and oil absorption capacity, least gelation concentration, foaming capacity and emulsifying capacity and emulsion stability and foaming stability were also measured for the full fat and defatted Vicia Villosa flours. Results and discussion: The results obtained from the measurement of physical properties for the Vicia Villosa seed showed that length, width, and thickness of the seeds were 5.4 mm, 5.37 mm, and 5.38 mm respectively. The surface area of seeds was found to be 90.98 mm2. True density, bulk density, and porosity of samples were found to be 1286.3 mm3, 788.8 mm3, and 38.67%, respectively. The amount of protein for full fat and defatted Vicia Villosa flour was 28.3% and 31.02%, respectively. L* was measured for the obtained flours and the highest L* was belonged to defatted Vicia Villosa flour, probably due to the removal of the seed shells in the solvent removal stage. Defatting of flour would result in brighter and increase in protein content of flour. The test on protein solubility showed the high dependency of this parameter to pH of the flour proving the U form dependency in the pH range of 2-12. At an isoelectric point of 4.5, the minimum solubility of existing proteins was shown. Water and oil absorption capacity of Full fat were 1.33± 0.4 and 0.85± 0.07 and Defatted Vicia Villosa flour,were 1.94± 0.2 and 1.19± 0.1 respectively (grams of water or oil per grams of the sample). Furthermore, at pH= 4.5, the emulsion and foaming capacity decrease due to its proximity to the isoelectric point. It is noteworthy that in isoelectric pH, the highest foaming stability and the lowest emulsion stability were observed. In addition, the results showed that pH and defatting conditions have a significant effect on functional properties that can be created by changing these parameters, flours, and products with various characteristics. The results showed that changes in pH and defatting process affected the solubility, water and fat absorption, least gelation concentration, foaming capacity and emulsion capacity of flour, so that by defatting and changing pH, functional properties improved significantly.
Masoud Taghizadeh; Behdad Shokrollahi; Fatemeh Hamedi
Abstract
Due to the need to find new protein sources with considering the fact that the bitter vetch seed has high levels of protein content, physicochemical and mechanical properties of bitter vetch seed and functional properties of its flour were evaluated in this study. The effects of altering the pH on protein ...
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Due to the need to find new protein sources with considering the fact that the bitter vetch seed has high levels of protein content, physicochemical and mechanical properties of bitter vetch seed and functional properties of its flour were evaluated in this study. The effects of altering the pH on protein solubility, foaming capacity, foaming stability, emulsion capacity and emulsion stability were studied. The average length, width and height of the grains were 3.5638 mm, 3.6197 mm and 3.8365 mm. the arithmetic and the geometric mean diameter, sphericity and the area were 3.6733mm, 3.6701mm, 1. 0318 and 42.405mm2 respectively. The average true density, bulk density and porosity were 1326.6 kg/m3, 0.7962 kg/m3 and 40.2753% respectively. also the average coefficients of static friction of the plywood, glass, rubber, fiberglass and galvanized iron surface layer were 0.4348, 0.1943, 0.4244, 0.3249 and 0.3739 respectively. Flour produced from this seed contains 24% protein and 9% fat. water and oil absorbing capacity were obtained 2.01 ±0.01 and 1.77±0.03 respectively (grams of water or oil per grams of sample). The results also showed that changes in pH, affected the solubility, foaming capacity, foaming stability, emulsion capacity and emulsion stability of bitter vetch flour.
