MICROWAVE ASSISTED EXTRACTION (MAE) OF PHENOLIC COMPOUND FROM RICE BRAN: OPTIMIZATION AND COMPARISON WITH OTHER EXTRACTION METHODS
Indonesia produced 54.42 million tons of dry milled rice (DMR) in 2021. From that, there are around 5.44 million tons of rice bran and only used as low-economic animal feed even though it contains phenolic compounds that have a high health benefits. The purpose of this study was to determine the mos...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/65587 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Indonesia produced 54.42 million tons of dry milled rice (DMR) in 2021. From that, there are around 5.44 million tons of rice bran and only used as low-economic animal feed even though it contains phenolic compounds that have a high health benefits. The purpose of this study was to determine the most optimal method and operating conditions for the extraction of phenolic compounds from rice bran that produced extracts with the highest phenolic content and yield of all treatments varied on a laboratory scale. The research is divided into three stages, the preliminary stage, the main stage of research, and the comparison stage. In the preliminary stage, the best phenolic compound extraction method was determined under operating conditions based on the literature: maceration and stirring, microwave-assisted extraction (MAE), and ultrasound-assisted extraction (UAE). The MAE method provides the highest TPC value and the shortest extraction time and there are still few MAE optimization studies on rice bran. In the main stage of the research, optimization of the operating conditions for the extraction of phenolic compounds was carried out with variations in the concentration of ethanol solvent, extraction time, and microwave power. The optimization method used is Box-Behnken Response Surface Methodology (RSM) because it can be used for multivariable optimization with a small number of experiments. Based on the results of the study, the optimized MAE operating conditions of rice bran were 80% ethanol concentration, 1.96 minutes extraction time, and 180 W microwave power. In the comparison step, optimized MAE conditions were compared with maceration, UMAE, and UAE extraction methods from the literature for the same rice bran. The results showed that the optimized MAE method gave the highest TPC at 8.967 mg EAG/100g rice bran and the yield was 93.4%. In addition, the origin of the rice bran used was compared between the defatted and the non defatted rice bran. The results show a preference for using defatted rice bran to extract phenolic compounds for RBO (rice bran oil) industry by-product utilization. In addition, raw phenolic powder from non defatted rice bran may still be contaminated with oil. |
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