Antioxidant property of solvent extract and acid/alkali hydrolysates from rice hulls

Vadivel, Vellingiri; Brindha, P.

doi:10.1016/j.fbio.2015.06.002

Cited by 33 publications

(21 citation statements)

References 43 publications

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“…In the case of RB extracts, the TPC increased rapidly with an increase in the hydrolysis time up to 100 min and then it was constant until 120 min, whereas longer hydrolysis times are required in the RH. In agreement to our work, some previous research reports indicated that up to 120 min is appropriate for recovery polyphenols from different plant materials [ 11 ]. In addition, elevated hydrolysis temperatures favor the release of more phenolic compounds from both substrates, as can be seen in Figure 2 .…”

Section: Resultssupporting

confidence: 93%

“…A similar trend was observed for the temperature extraction except for the TPC where a slight decrease was noticed as the temperature increased up to 80 °C. Similar to our results, Vadivel and Brindha [ 11 ] found that the best extraction time for UAE of phenolics from RH with 75% ethanol was 25 min.…”

Section: Resultssupporting

confidence: 92%

“…Significant amounts of phenolic compounds in foods are bound to cell walls via linking with cellulose, hemicellulose, lignin, pectin and rod-shaped structural proteins and acid/alkali hydrolysis is the most common means of releasing phenolic compounds by breaking ether and ester bonds [ 19 ]. Phenolic compounds are better released with alkaline hydrolysis than in acid hydrolysis conditions giving maximum phenolic recovery [ 11 ]. However, severe or prolonged alkaline treatment may result in degradation of the released phenolic acids, and different compounds may have variable susceptibility to degradation.…”

Section: Resultsmentioning

confidence: 99%

“…The phytochemical compounds and antioxidant activity of RB has been extensively reported [ 7 , 8 , 9 ]; however, RH is not deeply exploited as a source of phytochemicals. Although numerous studies have shown the potential applications of RB in functional foods development, limited information exists about the RH [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Extraction Conditions of Free and Bound Phenolic Compounds from Rice By-Products and Their Antioxidant Effects

Irakli

Kleisiaris

Kadoglidou

et al. 2018

Foods

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Rice by-products are extensively abundant agricultural wastes from the rice industry. This study was designed to optimize experimental conditions for maximum recovery of free and bound phenolic compounds from rice by-products. Optimized conditions were determined using response surface methodology based on total phenolic content (TPC), ABTS radical scavenging activity and ferric reducing power (FRAP). A Box-Behnken design was used to investigate the effects of ethanol concentration, extraction time and temperature, and NaOH concentration, hydrolysis time and temperature for free and bound fractions, respectively. The optimal conditions for the free phenolics were 41–56%, 40 °C, 10 min, whereas for bound phenolics were 2.5–3.6 M, 80 °C, 120 min. Under these conditions free TPC, ABTS and FRAP values in the bran were approximately 2-times higher than in the husk. However, bound TPC and FRAP values in the husk were 1.9- and 1.2-times higher than those in the bran, respectively, while bran fraction observed the highest ABTS value. Ferulic acid was most evident in the bran, whereas p-coumaric acid was mostly found in the husk. Findings from this study demonstrates that rice by-products could be exploited as valuable sources of bioactive components that could be used as ingredients of functional food and nutraceuticals.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimizing Extraction Conditions of Free and Bound Phenolic Compounds from Rice By-Products and Their Antioxidant Effects

Irakli

Kleisiaris

Kadoglidou

et al. 2018

Foods

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“…Rice husks (RH) are composed of 28% cellulose, 28.6% hemicelluloses, 24.4% lignin, and 18.4% extractive matter [8]. According to Vadivel and Brindha [9], the global production of RH is very significant and falls in the range of 20 million tons annually. Therefore, the utilization of the RH is of high importance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Compost for Rice Cultivation Developed by Rice Industrial By-Products to Serve Circular Economy

et al. 2019

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Rice is the major staple crop worldwide, whereas fertilization practices include mainly the application of synthetic fertilizers. A novel compost was developed using 74% of rice industrial by-products (rice bran and husks) and tested in rice cultivation in Greece’s main rice producing area. Field experimentation was conducted in two consecutive growing seasons (2017 and 2018) and comprised six fertilization treatments, including four compost rates (C1: 80, C2: 160, C3: 320 kg ha−1 of nitrogen all in split application, C4: 160 kg ha−1 of nitrogen in single application), a conventional treatment, as well as an untreated control. A total of 21 morpho-physiological and quality traits were evaluated during the experimentation. The results indicated that rice plants in all compost treatments had greater height (8%–64%) and biomass (32%–113%) compared to the untreated control. In most cases, chlorophyll content index (CCI) and quantum yield (QY) were similar or higher in C3 compared to the conventional treatment. C2 and C3 exhibited similar or greater yields, 7.5–8.7 Mg ha−1 in 2017 and 6.3–6.9 Mg ha−1 in 2018, whereas the conventional treatment resulted in 7.3 Mg ha−1 and 6.8 Mg ha−1 in the two years, respectively. No differences were observed in most quality traits that affect the rice commodity. The current study reveals that in sustainable farming systems based on circular economy, such as organic ones, the application of the proposed compost at the rate of 6 Mg ha−1 can be considered sufficient for the rice crop nutrient requirements.

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Recovering Bioactive Compounds from Starch Wastes

Khong¹,

Nguyen

2017

Recovering Bioactive Compounds From Agricultural Wastes

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Antioxidant property of solvent extract and acid/alkali hydrolysates from rice hulls

Cited by 33 publications

References 43 publications

Optimizing Extraction Conditions of Free and Bound Phenolic Compounds from Rice By-Products and Their Antioxidant Effects

Optimizing Extraction Conditions of Free and Bound Phenolic Compounds from Rice By-Products and Their Antioxidant Effects

A Novel Compost for Rice Cultivation Developed by Rice Industrial By-Products to Serve Circular Economy

Recovering Bioactive Compounds from Starch Wastes

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