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Effect of Grain Coating by Natural Materials on the Aroma Quality of KDML105 Rice


Paper Type 
Contributed Paper
Title 
Effect of Grain Coating by Natural Materials on the Aroma Quality of KDML105 Rice
Author 
Woraluk Angsuwarangoon, Patcharee Pripdeevech, Chonlada Bennett, Phumon Sookwong and Sugunya Mahatheeranont
Email 
woraluk.a@cmu.ac.th
Abstract:

     This study evaluated the effectiveness of different coating formulas in preserving the aroma quality of Khao Dawk Mali 105 (KDML 105) rice grains, particularly focusing on the key aroma compound, 2-acetyl-1-pyrroline (2AP). Initially, thirteen coating formulas were tested, and gum arabic was found to be the most effective in maintaining rice appearance and preventing mold growth during storage. In a subsequent experiment, rice coated with carnauba wax, gum arabic, and a 1:1 mixture of both was analyzed for 2AP content over 10 weeks using SHS-GC, under storage conditions of ambient temperature (25 °C) and 4 °C in polyethylene and laminated bags. The 10% gum arabic coating was the most effective at retaining 2AP after 10 weeks. Additionally, the study included a comparison with a 5% rice gel coating and a mixture of 5% gum arabic and 5% rice gel. The results indicated rice stored at 4 °C in laminated bags exhibited a 2-3% reduction in 2AP content after 6 weeks, while at ambient temperature, a reduction of 44-64% was observed. After 10 weeks, the 2AP contents in the 10% gum arabic coated rice were the highest at an average of 38-40% compared to those of the control group. Furthermore, the rancid compounds, including hexanal, heptanal, octanal, nonanal, and 2-pentylfuran, increased significantly in all coated rice samples at ambient temperature, with the highest hexanal content found in rice coated with a mixture of 5% gum arabic and 5% rice gel, showing approximately 22-55% increase compared with those of the uncoated rice. Overall, gum arabic coating was the most effective in preserving 2AP for at least 10 weeks, and storage at 4 °C provided the best conditions for aroma retention and rancid prevention.

Article ID
e2024084
Received Date 
2024-09-19
Revised Date 
2024-09-26
Accepted Date 
2024-09-26
Full Text 
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Keyword 
2-acetyl-1-pyrroline, grain coating, hexanal, rancid compound, SHS-GC
Volume 
Vol.51 No.5 (September 2024)
DOI 
https://doi.org/10.12982/CMJS.2024.084
Citation 
Angsuwarangoon W., Pripdeevech P., Bennett C., Sookwong P. and Mahatheeranont S., Effect of Grain Coating by Natural Materials on the Aroma Quality of KDML105 Rice , Chiang Mai J. Sci., 2024; 51(5): e2024084. DOI 10.12982/CMJS.2024.084.
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