Separation and concentration of hydroxycinnamic acids in alkaline hydrolyzate from rice straw by nanofiltration

Li, Yun; Qi, Benkun; Luo, Jianquan; Khan, Raees; Wan, Yinhua

doi:10.1016/j.seppur.2015.06.006

Cited by 25 publications

(13 citation statements)

References 35 publications

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“…In this case, an increase in the pH from 3.14 to 6.93, resulted in the rejections of acetic acid, formic acid, vanillic acid, and ferulic acid increasing from 24.58, 11.94, 37.9, and 45.14% to 62.1, 85.4, 94.6, and 95.26%, respectively. A further increase in pH to 9.05 resulted in rejections of almost 100% for the four acids, thereby indicating that these compounds essentially did not pass through the membrane, a phenomenon also observed by Li et al 31 This large variation in the rejection of carboxylic acid and phenolic compounds at a given pH value was therefore expected to be correlated to their respective pK a values. As shown in Table 2, the pK a values for acetic acid, formic acid, vanillic acid, and ferulic acid are within the range of 3.5-5.…”

Section: Inuence Of Solution Ph On the Membrane Separation Performancesupporting

confidence: 59%

Recovery of monosaccharides from dilute acid corncob hydrolysate by nanofiltration: modeling and optimization

et al. 2018

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Section: Inuence Of Solution Ph On the Membrane Separation Performancesupporting

confidence: 59%

Recovery of monosaccharides from dilute acid corncob hydrolysate by nanofiltration: modeling and optimization

et al. 2018

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“…Ferulic and p-coumaric acids were the predominant phenols (3.9 and 2.9 mg/g DW, respectively), while caffeic acid was the lowest one (0.03 mg/g DW). Previous studies reported that rice straw contained a variety of phenolic acids such as caffeic, chlorogenic, syringic, p-coumaric and ferulic [35][36][37][38][39]. …”

Section: Identification and Quantification Of Phenolic Compounds By Hplcmentioning

confidence: 99%

Phenolic Compounds and Antioxidant Activity of Rice Straw Extract

Elzaawely

Maswada

El-Sayed

et al. 2017

ILNS

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Abstract. Agricultural wastes cause a serious environmental problem in Egypt. Utilization of these wastes by an environmentally friendly way is a very important issue. The objective of this study was to utilize rice straw into high-value products. Antioxidant activity, total soluble phenols, and flavonoids were evaluated in ethyl acetate extract prepared from rice straw after alkaline hydrolysis. Total phenols were found to be 221.6 mg gallic acid equivalents (GAE), while total flavonoids were 4.9 mg rutin equivalents (RE). The extract exhibited strong antioxidant activity measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging method and its IC 50 value was 0.4 mg/ml. Furthermore, the ethyl acetate extract possessed high antioxidant activity assayed by β-carotene bleaching method and its value of lipid peroxidation inhibition (LPI) was 75.4%. It also exhibited high reducing power and its IC 50 value was equal to 0.06 mg/ml. HPLC analysis indicated that this extract contained seven phenolic acids including; protocatechuic, caffeic, syringic, p-coumaric, ferulic, rosmarinic and cinnamic, in addition to two flavonoids; qurecetin and kaempferol. Results indicated that ferulic and p-coumaric acids were the major soluble phenolic acids in rice straw, and their concentrations were 3.9 and 2.9 mg/g DW. It can be summarized that the strong antioxidant activity of ethyl acetate extract, prepared from rice straw, was highly correlated with its high level of phenolic compounds.

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“…Considering that one kilogram of rice grain provides 1.5 kg RS and the largest portion of RS is commonly burnt in the field, there is a continuous increase of air pollution associated with the release of dioxins, affecting human health and reducing the soil feasibility [ 3 , 5 ]. In this way, efforts have recently been made to find new alternatives for the reuse of RS, such as bioethanol production [ 6 ], silica extraction [ 7 ], paper production [ 8 ], cellulose isolation [ 9 ] or bioactive compound extraction [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw

Freitas

González‐Martínez

Chiralt

2020

Foods

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The extraction of water-soluble bioactive compounds using different green methods is an eco-friendly alternative for valorizing agricultural wastes such as rice straw (RS). In this study, aqueous extracts of RS (particles < 500 µm) were obtained using ultrasound (US), reflux heating (HT), stirring (ST) and a combination of US and ST (USST) or HT (USHT). The extraction kinetics was well fitted to a pseudo-second order model. As regards phenolic compound yield, the US method (342 mg gallic acid (GAE). 100 g−1 RS) was more effective than the ST treatment (256 mg GAE·100 g−1 RS), reaching an asymptotic value after 30 min of process. When combined with HT (USHT), the US pre-treatment led to the highest extraction of phenolic compounds from RS (486 mg GAE·100 g−1 RS) while the extract exhibited the greatest antioxidant activity. Furthermore, the USHT extract reduced the initial counts of Listeria innocua by 1.7 logarithmic cycles. Therefore, the thermal aqueous extraction of RS applying the 30 min US pre-treatment, represents a green and efficient approach to obtain bioactive extracts for food applications.

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Separation and concentration of hydroxycinnamic acids in alkaline hydrolyzate from rice straw by nanofiltration

Cited by 25 publications

References 35 publications

Recovery of monosaccharides from dilute acid corncob hydrolysate by nanofiltration: modeling and optimization

Recovery of monosaccharides from dilute acid corncob hydrolysate by nanofiltration: modeling and optimization

Phenolic Compounds and Antioxidant Activity of Rice Straw Extract

Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw

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