Common Vetch (Vicia sativa) as a New Starch Source: Its Thermal, Rheological and Structural Properties After Acid Hydrolysis

Abstract

The common vetch plant is used mainly for animal nutrition. The seeds from this leguminous plant contain a relatively high quantity of starch. There are few studies regarding common vetch and this research was designed to evaluate the thermal, rheological and structural properties of the starch extracted from common vetch seeds, both native and after treatment with HCl at different concentrations (0.1 mol L −1 and 0.3 mol L −1 ) and temperatures (25°C and 50°C). The curves obtained from differential scanning calorimetry showed an increase in the peak and conclusion temperatures after the acid modification. The thermogravimetric curves of the native and acid-modified samples presented three characteristic mass losses, with higher thermal stability after acid modification. The viscoamilographic analysis showed an increase in the final and peak viscosities for the common vetch starch after the treatment, which was probably due to the hydrolysis of the protein that was present in the sample. The micro-images obtained by field emission gun-scanning electron microscopy showed that the granular structure of the starch was not affected after acid treatment. The diffractometry analysis showed the same Ctype pattern for all the samples. The common vetch starch presented interesting properties that could lead to different uses in industry and aggregate more value for this product.

Corn and Pinhão Starches Modified with Sodium Tripolyphosphate: Thermal, Pasting, Structural and Morphological Properties

“…As shown in Table , the moisture of the samples varied between 7.49 and 8.69%. Values between 10.5 and 11.2% were found by other authors . The dehydration temperature showed in the first mass loss was similar for the native starches.…”

“…The pasting properties of samples were obtained with RVA‐4 equipment (Newport Scientific, Australia), where 28 g of an 8% dispersion of starch (d.b.) were prepared and subjected to the following heating (until 95 °C) and cooling cycle (until 50 °C) …”

“…The microscope MIRA 3 (Tescan, Czech Republic) was used to evaluate the diameter and shape of the starch granules. This analysis was done using an electron voltage of 15 kV in the field emission gun, generated by a tungsten lamp filament, according to the methodology of Bet et al…”

Induced effects by oxidation with potassium permanganate on the thermal, morphological, colorimetric and pasting properties of corn starch

“…The samples were placed on a carbon tape and pulverised with gold and palladium to promote the electrons conductivity. A tension of 20 kV was generated by a lamp with tungsten filament [14]. The chemicals elements present in the samples were identified by EDS, which is based on the released energy measurement when an excited atom (due to electron beam that focuses on the sample) returns to its normal state.…”

Effect of Acid-Alcohol Treatment on Physicochemical Properties of Ball-Milled Potato Starches

“…Many researchers also found that the botanical origin and crystalline type of starch could influence the hydrolysis kinetics, which meant that the different inner structure of starch granules had a different acid hydrolysis process. However, up to now almost all studies on the physicochemical properties of acid hydrolyzed starch are based on the native starch treated by acid . There is still little insight on the acid hydrolysis of modified starch with different crystalline structure.…”