Abstract
Response surface methodology was employed to study phosphorous (P) and resistant starch (RS) content of resistant Canna edulis Ker starch phosphate monoester by starch phosphorylation with sodium mono- and dihydrogen orthophosphate. A five-level-four-factor central composite design was used for maximizing the P and RS content. The optimal reaction conditions obtained were NaH 2PO 4·2H 2O to Na 2HPO 4·12H 2O molar ratio of 1:0.44, phosphate sodium to starch weight ratio of 1.76:1, reaction temperature of 131.6 °C and reaction time of 2.43 h. The theoretical P and RS content were attained to about 0.58 and 73.17%, respectively. P and RS content experimentally obtained were 0.55 and 71.93%, in agreement with the predicted values. In addition, the structural characteristic of the purified starch phosphate monoester was investigated by 31P-nuclear magnetic resonance ( 31P-NMR), fourier transform-infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM).
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