The purpose of this study was to characterize, isolate and chemically modify tiger nut (Cyperus sculentus L.) starch with octenyl succinic anhydride. The efficiency of the chemical modification was 0.04. Chemical composition, particle morphology (SEM), particle size, X-ray diffraction, infrared analysis, thermogravimetric analysis, differential scanning calorimetry and swelling and solubility power were determined for characterization of the native and modified starch. Both showed similar chemical composition and amylose and amylopectin contents, as well as absorption spectra in the infrared region without modification of the molecular structure and A-type crystalline pattern. The particles of both had an oval and spherical shape. The modified starch was more resistant to temperature and the gelatinization process occurred at 67.52 °C. These results suggest that tiger nut starch has a great industrial potential.
Sequential experimental design strategy was applied in order to investigate the best conditions for tiger nut milk extraction process taking into account performance and physicochemical features, simultaneously. Protein, lipid, starch, calcium and total sugar composition were considered for this optimization. The tested factors were: sodium metabisulphite concentration (X 1 ), soaking time (X 2 ), soaking temperature (X 3 ) and water proportion (X 4 ). From the 2 4-1 fractional factorial design all independent variables were found to be statistically significant (p <0.1) and X 1 , X 2 and X 3 were chosen for the central composite design as water proportion was already in the minimum value. The best operational conditions, obtained by desirability function, were: 8 h of soaking time, 22° C for soaking temperature, 0.20% (w/v) of sodium metabisulphite and 1:1 tuber (g): water (ml) proportion. In those conditions a 78% yield was obtained for a tiger nut milk with 2.60% protein, 3.7% total sugar and 8.72% starch. The high yield obtained and the great nutritional value shows that this milk has a great potential for application in the food industry.
The appropriate concentrations of inulin and modified tiger nut starch were evauated in a sequential experimental design to improve the microencapsulation process of tiger nut milk. The stability emulsification index was the response variable studied to evaluate the effectiveness of the microencapsulation process. The concentrations observed through the central composite design (CCD) that most improved the stability emulsification index corresponded to 9.40% inulin and 0.40% modified tiger nut starch. The preservation capacity of the microencapsulated tiger nut milk was evaluated by determining the solubility in water (76%) and oxidative stability (46 h) of the microspheres. The chemical composition indicated important concentrations of protein (5.40%), calcium (191.65 mg / 100 g), carbohydrate (65.10%) and vitamin C (3.17%).
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