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- Title
Effect of Heat Moisture Treatment Conditions on Swelling Power and Water Soluble Index of Different Cultivars of Sweet Potato (Ipomea batatas (L). Lam) Starch.
- Authors
Senanayake, Suraji; Gunaratne, Anil; Ranaweera, K. K. D. S.; Bamunuarachchi, Arthur
- Abstract
A study was done to analyse the change in swelling power (SP) and the water soluble index (WSI) of native starches obtained from five different cultivars of sweet potatoes (swp 1 (Wariyapola red), swp 3 (Wariyapola white), swp 4 (Pallepola variety), swp 5 (Malaysian variety), and swp 7 (CARI 273)) commonly consumed in Sri Lanka. Extracted starch from fresh roots, two to three days after harvesting has been modified using 20%, 25%, and 30% moisture levels and heated at 85°C and 120°C for 6 hours and determined the SP and WSI. Results were subjected to general linear model, and analysis of variance (ANOVA) was carried out by using MINITAB version 14. Overall results showed a significantly high level (P < 0.05) of SP andWSI in all the cultivars of moisture-temperature treated starches than their native starch. Correlation analysis showed an effect on SP with the variation in the cultivar, temperature, and moisture; temperature combination and moisture alone had no significant effect. Significantly high levels of swelling power (P > 0.05) were observed in 20%-85°C, and 30%-120°C and the highest amount of swelling in the modified starch than its native form was observed in swp 7 cultivar. Results revealed a nonlinear relationship in theWSI with the cultivar type, moisture level, and the lower moisture-temperature combinations but higher temperature-moisture combinations had a significant effect. SP andWSI had a slight positive linear relationship according to analysis. Based on the results, a significantly high level of swelling and water solubility of native starches of different cultivars of sweet potatoes can be achieved by changing the moisture content to 30% and heating at 120°C for 6 hours.
- Subjects
SWEET potato varieties; STARCH; EFFECT of moisture on plants; EFFECT of temperature on plants; LINEAR statistical models; STATISTICAL correlation
- Publication
ISRN Agronomy, 2013, p1
- ISSN
2090-7664
- Publication type
Article
- DOI
10.1155/2013/502457