Structure analysis of condensed tannin from rice straw and its inhibitory effect on Staphylococcus aureus

Shi, Jie; Wang, Yazhu; Wei, Huanran; Hu, Jiajun; Gao, Min-Tian

doi:10.1016/j.indcrop.2020.112130

Cited by 37 publications

(17 citation statements)

References 43 publications

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“…Consequently, level of catechin compound was lower in the dry extract of this treatment B. This result was supported by Shi et al (2020) who explained that catechin/epicatechin, epicalocatechin, epicatechin gallate, dimer catechin, fisetinidin, chebulic acid are the main monomer unit structures of condensed tannin. The tannin content in this dry extract of treatment B was also higher than that in the raw gambier from Siguntur village (26%) found by Yeni et al (2014), and in tea leaves (9.25%) reported by Tugiyanti et al (2019).…”

Section: Resultssupporting

confidence: 63%

Determination of the best method for processing gambier liquid by-product [Uncaria gambir (hunter) roxb] as natural antioxidant sources

Ismail

Rizal

Armenia

et al. 2021

J. Indonesian Trop. Anim. Agric.

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The study was conducted to determine the best gambier liquid by-product (GLB) processing methods based on antioxidant activity as natural antioxidant sources. The processing methods were A (ethyl acetate fractionation), B (oven drying) and C (freeze drying) methods. The observed variables were dry extract (using weighing method), tannin (using hide powder method), catechin (using SNI 01- 339-2000 method), total phenol (using folin ciocalteu reagents) and antioxidant activities (DPPH method) based on ICAO50. These antioxidant activities were compared with vitamin C as a positive control. The results indicated that the different processing methods significantly affected (P<0.05) dry extract, tannin, catechin, total phenol and antioxidant activity of GLB. The highest dry extract, tannin, catechin, total phenol, and antioxidant activity from GLB were at treatment B (10.76%), B (39.69%), A (86.07%), C (80.97 mg GAE/g), and C (ICAO50 2.74 µg/mL), respectively. The antioxidant activity on treatment C was not different from vitamin C antioxidant activity (2.88µg/mL). Thus, the treatment C (freeze drying method) was the best method to process GLB based on antioxidant activity as natural antioxidant sources.

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Section: Resultssupporting

confidence: 63%

Determination of the best method for processing gambier liquid by-product [Uncaria gambir (hunter) roxb] as natural antioxidant sources

Ismail

Rizal

Armenia

et al. 2021

J. Indonesian Trop. Anim. Agric.

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“…Flavonoid extraction from baobab seeds was also promoted when US treatments were carried out at higher temperatures [ 17 ]. Several compounds with proven antioxidant capacity, such as ferulic, protocatechuic, p -coumaric, caffeic, and vanillic acids, tricin, and vanillin have been identified in RS extracts by other authors [ 10 , 40 ].…”

Section: Resultsmentioning

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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“…Apple CTs exert hypocholesterolemic properties imparted by their direct interactions with cholesterol via ionic and hydrophobic interactions, as well as intermolecular hydrogen bonding [ 25 ]. Moreover, CTs from different plant sources were reported to exhibit antimicrobial activities, such as the inhibitory effect of rice straw CTs on Staphylococcus aureus , through the reduction of intercellular ATP and inhibition of bacterial biofilm formation [ 26 ]. Likewise, CT derivatives assembled with polysaccharides exhibited an antiadhesive and bactericidal effect on Pseudomonas aeruginosa and Staphylococcus aureus , which suggested their use to avoid infections imparted by bacterial adhesion to biomedical appliances [ 27 ].…”

Section: Chemistry and Diversity Of Tanninsmentioning

confidence: 99%

Effect of Gut Microbiota Biotransformation on Dietary Tannins and Human Health Implications

et al. 2021

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Tannins represent a heterogeneous group of high-molecular-weight polyphenols that are ubiquitous among plant families, especially in cereals, as well as in many fruits and vegetables. Hydrolysable and condensed tannins, in addition to phlorotannins from marine algae, are the main classes of these bioactive compounds. Despite their low bioavailability, tannins have many beneficial pharmacological effects, such as anti-inflammatory, antioxidant, antidiabetic, anticancer, and cardioprotective effects. Microbiota-mediated hydrolysis of tannins produces highly bioaccessible metabolites, which have been extensively studied and account for most of the health effects attributed to tannins. This review article summarises the effect of the human microbiota on the metabolism of different tannin groups and the expected health benefits that may be induced by such mutual interactions. Microbial metabolism of tannins yields highly bioaccessible microbial metabolites that account for most of the systemic effects of tannins. This article also uses explainable artificial intelligence to define the molecular signatures of gut-biotransformed tannin metabolites that are correlated with chemical and biological activity. An understanding of microbiota–tannin interactions, tannin metabolism-related phenotypes (metabotypes) and chemical tannin-metabolites motifs is of great importance for harnessing the biological effects of tannins for drug discovery and other health benefits.

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Structure analysis of condensed tannin from rice straw and its inhibitory effect on Staphylococcus aureus

Cited by 37 publications

References 43 publications

Determination of the best method for processing gambier liquid by-product [Uncaria gambir (hunter) roxb] as natural antioxidant sources

Determination of the best method for processing gambier liquid by-product [Uncaria gambir (hunter) roxb] as natural antioxidant sources

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

Effect of Gut Microbiota Biotransformation on Dietary Tannins and Human Health Implications

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