Identification and quantification of phenolic and flavonoid components in straw and seed husk of some rice varieties (<i>Oryza sativa</i>L.) and their antioxidant properties

Karimi, Ehsan; Mehrabanjoubani, Pooyan; Keshavarzian, Maryam; Oskoueian, Ehsan; Jaafar, Hawa Z. E.; Abdolzadeh, Ahmad

doi:10.1002/jsfa.6567

Cited by 49 publications

(35 citation statements)

References 30 publications

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“…In rice, kaempferol and quercetin components were also identified in rice seeds [36]. In addition, Karimi et al [37] detected a large amount of kaempferol in rice straw that was able to scavenge free radicals. In this study, we did not find any involvement of the two compounds in response to water deficit stress, Molecular weights of kaempferol and quercetin are 286 and 302, respectively, and they are both greater than those of the detected phenolics (p-hydroxybenzoic acid: 138; cinnamic acid: 148; ferulic acid: 194; p-coumaric acid: 164, benzoic acid: 122, syringic acid: 198).…”

Section: Discussionmentioning

confidence: 99%

Involvement of Secondary Metabolites in Response to Drought Stress of Rice (Oryza sativa L.)

Quan

Anh²,

Khang³

et al. 2016

Agriculture

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Abstract:In this study, responses of rice under drought stress correlating with changes in chemical compositions were examined. Among 20 studied rice cultivars, Q8 was the most tolerant, whereas Q2 was the most susceptible to drought. Total phenols, total flavonoids, and antioxidant activities, and their accumulation in water deficit conditions were proportional to drought resistance levels of rice. In detail, total phenols and total flavonoids in Q8 (65.3 mg gallic acid equivalent (GAE) and 37.8 mg rutin equivalent (RE) were significantly higher than Q2 (33.9 mg GAE/g and 27.4 mg RE/g, respectively) in both control and drought stress groups. Similarly, the antioxidant activities including DPPH radical scavenging, β-carotene bleaching, and lipid peroxidation inhibition in Q8 were also higher than in Q2, and markedly increased in drought stress. In general, contents of individual phenolic acids in Q8 were higher than Q2, and they were significantly increased in drought stress to much greater extents than in Q2. However, p-hydroxybenzoic acid was found uniquely in Q8 cultivars. In addition, only vanillic acid was found in water deficit stress in both drought resistant and susceptible rice, suggesting that this phenolic acid, together with p-hydroxybenzoic acid, may play a key role in drought-tolerance mechanisms of rice. The use of vanillic acid and p-hyroxybenzoic acid, and their derivatives, may be useful to protect rice production against water shortage stress.

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Section: Discussionmentioning

confidence: 99%

Involvement of Secondary Metabolites in Response to Drought Stress of Rice (Oryza sativa L.)

Quan

Anh²,

Khang³

et al. 2016

Agriculture

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“…OSE has the lowest DPPH scavenging activity compared to vanillin and coumaric acid, this data was not validated with previous study showed that O. sativa extract has rich secondary metabolites, especially alkaloids and phenolic acids that have strong antioxidant activity 50 . Phenolic and flavonoid contents are associated with strong antioxidant activity and especially in terms of DPPH and nitric oxide free radical scavenging 51 . The phenolic extracts from fermented O. sativa showed slow inhibition kinetics of the DPPH radical, as IC 50 53,54 .…”

Section: Discussionmentioning

confidence: 99%

Antioxidant and Anti Aging Assays of <I>Oryza sativa</I> Extracts, Vanillin and Coumaric Acid

Widowati

Fauziah

Herdiman

et al. 2016

JNR

152

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Ipomoea reniformis Chaos is claimed in Indian traditional medical practice to be useful in the treatment of epilepsy and neurological disorders. In the present study, pretreatment effect of methanolic extract of Ipomoea reniformis on epilepsy and psychosis was evaluated in rodents using standard procedures. Besides evaluating epileptic and behavioral parameters, neurotransmitters such as Gamma-Amino Butyric Acid (GABA) in epilepsy and in psychosis dopamine, noradrenaline and serotonin contents in the rodent brain were estimated. The extract pretreatment reduced maximal electro shock; Isoniazid (INH) and Pentylenetetrazole (PTZ) induced seizures and also significantly inhibited the attenuation of brain GABA levels by INH and PTZ in mice. These results suggested that the observed beneficial effect in epilepsy may be by enhancing the GABAergic system. The test drug also inhibited the apomorphine induced climbing and stereotyped behavior and showed significantly reduced levels of brain dopamine, noradrenaline and serotonin which may be due to blocking of central dopaminergic, noradrenergic and serotonergic pathways or by enhancing the GABAergic system. The results obtained in present study suggest that the title plant possesses antiepileptic and antipsychotic activities in rodents.

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“…However a major compound (10.014 min migration time) could not be identified, but its spectrum (denoted by X) indicated that it should be a flavonoid. The presence of flavonoids in rice straw has been reported (Karimi et al 2014).…”

Section: Phenolic Compoundsmentioning

confidence: 99%

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Moniz¹,

Lino²,

Duarte³

et al. 2015

BioResources

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An integrated strategy was followed to valorise rice straw, one of the most relevant biomass feedstocks available worldwide, to selectively recover solubilised hemicelluloses and lignin. The pathway encompassed the use of autohydrolysis to hydrolyse the hemicelluloses and an ethanol-based organosolv process to solubilise lignin. Several autohydrolysis conditions were assayed with the best results obtained at 210 ºC (log R0 4.15), which enabled high removal of hemicelluloses, yielding an oligosaccharide-rich hydrolysate and a treated biomass with low content of hemicelluloses and enriched in cellulose and lignin. The effects of ethanol concentration (5 to 75%), and reaction time (0 to 24 h) on lignin removal under mild temperature (30 ºC) were studied. In optimal conditions (60.5% ethanol, 24h) the delignification yield reached 42%, whereas glucan solubilisation was below 17%. Lignin solubilisation yield was not influenced by the organosolv treatment duration while ethanol concentration favored the delignification up to 60.5% ethanol. The organosolv liquors contained economic interesting ligninderived compounds such as vanillin, ferulic, and coumaric acids. The chemical composition and enzymatic digestibility of the treated biomass from autohydrolysis and organosolv delignification were compared, with the latter presenting an almost 10% higher enzymatic digestibility than the former.

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Identification and quantification of phenolic and flavonoid components in straw and seed husk of some rice varieties (Oryza sativaL.) and their antioxidant properties

Abstract: The present study revealed that rice straw and seed husk of Iranian varieties shows high antioxidant activities and they contain various types of phenolic and flavonoid compounds that could be use in food and medical industries.

Cited by 49 publications

References 30 publications

Involvement of Secondary Metabolites in Response to Drought Stress of Rice (Oryza sativa L.)

Involvement of Secondary Metabolites in Response to Drought Stress of Rice (Oryza sativa L.)

Antioxidant and Anti Aging Assays of <I>Oryza sativa</I> Extracts, Vanillin and Coumaric Acid

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

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