Abstract
In this study, rice pedicle extracts (Oriza sativa. L.) were obtained by high pressure reactor using water, and sodium hydroxide at temperatures of 70, 90, 110 130 °C. The extracts were evaluated for total phenolic content, antioxidant activity and growth inhibition of Escherichia coli and Candida albicans. Their results were compared to Soxhlet extraction by using ethanol (95%v/v). The results showed that the use of different temperatures had a significant effect on the percentage of phenolic compounds, and the alkali method had a significant effect on the amount of phenolic compounds rather than water extraction (128.72 and 51.79 GA/g, respectively). The highest antimicrobial activity levels were obtained in ethanol extracts that the extracts have inhibitory effect on E. coli. None of extracts had inhibitory effect on Candida albicans. The results provided the evidence that the studied rice (Oriza sativa. L.) pedicle extract might be potential sources of phenolic compound, natural antioxidant and antimicrobial agents.
Highlights
Fat oxidation is one of the main economic concerns for food products
To produce added value material, this study aimed to evaluate total phenolic compounds and antioxidant activity of extracts obtained from rice pedicle in aqueous and alkaline media in high pressured- reactor
Due to decrease in polarity compared to pure solvents, alcoholwater mixture has the solubility capability of phenolic compounds with lower polarity and increases the extraction rate of phenolic compounds several times[11]
Summary
Fat oxidation is one of the main economic concerns for food products. Antioxidants are substances that may be inherent in the product, or it might be added to food through a process. Antioxidants are compounds maintaining food and reducing the speed and intensity of chemical reactions by slowing the corruption, keen or discoloration due to oxidation [1]. A large number of natural and synthetic antioxidant compounds are used in the treatment or prevention of multiple diseases. Phenolic compounds are one of the main groups preventing diseases such as atherosclerosis and cancer. Applying natural phenolic acids as compounds involving antioxidants has attracted researchers’ attention[3]. By neutralizing the free radicals, antioxidants can reduce the risk of cardiovascular disease, and block cancer progression
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