Evaluation of molecular weight distribution, pasting and functional properties, and enzyme resistant starch content of acid-modified corn starches
2008
Koksel, Hamit (Hacttepe University, Ankara, Turkey), E-mail: [email protected] | Ozturk, Serpil (Hacttepe University, Ankara, Turkey) | Kahraman, Kevser (Hacttepe University, Ankara, Turkey) | Basman, Arzu (Hacttepe University, Ankara, Turkey) | Ozbas, Ozen Ozboy (Inonu University, Malatya, Turkey) | Ryu, G.H. (Kongju National University, Yeasan, Republic of Korea)
The aim of this study was to produce resistant starch preparations from acid-modified corn starches prepared at various hydrolysis levels (0.5-4.0 hr). Effect of autoclaving cycles on resistant starch (RS) formation was investigated. Molecular weight distribution, pasting and functional properties of acid-modified corn starches were determined. For RS fort-nation native and acid-modified starch samples were gelatinized and autoclaved (1 or 2 cycles). While native and acid-modified starches did not contain any RS, the levels increased to 9.0-13.5% as a result of storage at 95℃ after first autoclaving cycle. Second autoclaving cycle together with storage at 95℃ brought final RS contents of the samples incubated at 4 and 95℃ after the first cycle to comparable level. As acid modification level increased, the amount of high molecular weight fractions decreased, resulting in significant decreases in viscosities (p less than 0.05). The samples produced in this study had low emulsion stability and capacity values.
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