Articles

OPTIMIZATION OF PECTIN EXTRACTION FROM DRAGON FRUIT PEEL

Article number
1012_195
Pages
1443 – 1450
Language
English
Abstract
Hot acid extraction was applied for pectin extraction from dragon fruit (Hylocereus polyrhizus) peel powder and the extraction conditions were optimized using response surface methodology.
Twenty treatments were assigned based on the central composite design (CCD) at five variation levels with blocked design which allowed the estimation of individual and interaction factors effects independently.
Three independent variables studied were temperature (50-85°C), time (40-150 min) and pH (2.5-4.0). The experimental data were fitted to a second-order polynomial equation using regression analysis.
The results indicated that pH was the main factor influencing the pectin yield which increased with decreasing pH, and increasing temperature and time.
Based on the 3-D response surface and contour plots, the optimum conditions for extraction of pectin from dragon fruit peel were at 67.7°C for 77 min and at pH 2.0. The experimental value of 30.08% pectin yield was statistically compared with the predicted value of 30.19% yield given by the model.
Hence, the experimental value was found to be in agreement with the predicted value.

Publication
Authors
M.Z. Nur Izalin, K. Muhammad, J. Bakar , N. Mohd Adzahan
Keywords
Hylocereus polyrhizus, response surface methodology, yield, 3-D response surface, contour plots
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