Enhanced functional properties of tannic acid after thermal hydrolysis

Kim, T.J.; Silva, J.L.; Jung, Yean-Sung

doi:10.1016/j.foodchem.2010.10.086

Cited by 54 publications

(54 citation statements)

References 24 publications

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“…Low quantities of free gallic acid are generally present in several plants; large-scale production of free gallic acid involves purification from hydrolyzed tannic acid (Yoshida & Yamada, 1985;Kambourakis et al, 2000). These processes require multiple thermal and/or enzymatic preparation steps, which are costly and may cause severe environmental pollution (Kim et al, 2011). Therefore, using pequi fruit peel as feedstock for production of gallic acid and its derivatives may be a cheaper and environmentally safer alternative.…”

Section: Resultsmentioning

confidence: 99%

Gallic acid as the major antioxidant in pequi (Caryocar brasiliense Camb.) fruit peel

Rocha

Melo

Paula

et al. 2015

Rev. bras. plantas med.

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ABSTRACT:In this study, ethanol-water extracts of pequi fruit peel were fractionated in order to identify and quantify the major antioxidant present in it. The fractions were subjected to liquid-liquid phase extraction and silica-gel column chromatography, and antioxidant activity was monitored using the 2,2-diphenyl-1-picrylhydrazyl radical-scavenging assay. The purity of the fractions was evaluated using thin-layer chromatography and high-performance liquid chromatography (HPLC). The substance with antioxidant property was identified through the analysis in a liquid chromatography-mass spectroscopy fragmentation and was quantified using HPLC. After the Silica-gel fractionation, it was identified a fraction with high antioxidant activity and purity, which contained gallic acid as the main compound. The gallic acid was found at the amount of 26.54 ± 1.13 mg/g of the dry mass of the pequi fruit peel. Because the quantifications were performed using crude ethanol-water extract, it was suspected that gallic acid was present in a free form. Thus, pequi fruit peel may serve as an attractive alternative of feedstock for natural antioxidant production. Moreover, the results obtained in this study emphasize the value of the pequi plant, and suggests improved opportunities for families that use this fruit`s products.Keywords: plant extracts, fractionation, natural products, antioxidants RESUMO: Ácido gálico como principal antioxidante da casca do fruto do pequi (Caryocar brasiliense Camb.). Extratos hidroetanólicos da casca do fruto do pequi foram fracionados a fim de identificar e quantificar o principal antioxidante presente. Frações do extrato foram submetidas ao particionamento líquido-líquido e fracionamento em coluna de sílica gel. As atividades antioxidantes das frações foram monitoradas usando ensaio de redução do radical 2,2-difenil-1-picrilhidrazila e a pureza das frações foi avaliada em cromatografia de camada delgada e cromatografia líquida de alta eficiência (CLAE). A substância com propriedades antioxidantes foi identificada através da análise em sistema de cromatografia líquida associada à espectrometria de massas e foi quantificada em HPLC. Após o fracionamento identificou-se uma fração com alta atividade antioxidante e pureza, contendo ácido gálico como o composto principal. Ácido gálico foi encontrado em concentrações de 26,54 ± 1,13 mg/g de massa seca. Devido às quantificações terem sido realizadas no extrato hidroetanólico bruto, acredita-se que o ácido gálico esteja presente na forma livre. Assim, a casca do fruto pequi pode servir como interessante alternativa de matéria prima para a produção desse antioxidante natural. Além disso, esse resultado enfatiza o valor da planta do pequi e sugere oportunidades para as famílias que utilizam produtos de pequi.Palavras-chave: extratos de plantas, fracionamento, produtos naturais, antioxidantes

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Section: Resultsmentioning

confidence: 99%

Gallic acid as the major antioxidant in pequi (Caryocar brasiliense Camb.) fruit peel

Rocha

Melo

Paula

et al. 2015

Rev. bras. plantas med.

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“…Another issue that should be taken into account is hydrolysis of tannin molecules that may occurs under basic conditions [1,2,52] and at elevated temperatures [13,15]. The uncontrolled release of gallic acid during the hydrolysis may significantly affect tannin adsorption processes and the formation of its monolayers.…”

Section: Physicochemical Characteristics Of Tanninmentioning

confidence: 99%

“…1), tannin shows both reducing and stabilizing properties and is commonly used for the synthesis of silver [4][5][6], gold [4,7] and nickel [8] nanoparticles. Moreover, it has been widely reported in the literature, that tannin exhibits natural antioxidant [9,10], antimicrobial [11][12][13] and antiviral activity [14,15]. As an antioxidant compound, tannin and its derivatives, especially gallic and pyrogallol, prevent lipid oxidation and radical-mediated DNA cleavage by scavenging oxygen and oxygen-derived radicals [10].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of tannic acid on polyelectrolyte monolayers determined in situ by streaming potential measurements

Oćwieja

Adamczyk

Morga

2015

Journal of Colloid and Interface Science

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“…This compound is found in hornbeam and oak bark, oak apple, green or black tea, hops, pomegranate and in other plants and fruits. Gallic acid may occur either as a free (unbound) molecule or it can be conjugated in molecules of tannins, from which it is separated by acid or thermal hydrolysis (Kim et al 2011). In tannins, gallic acid forms esters with carbohydrates, especially with glucose.…”

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confidence: 99%

Use of natural substances for boar semen decontamination

Mazurová¹,

Kukla²,

Rozkot³

et al. 2015

Vet. Med. - Czech

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ABSTRACT:The aim of this study was to investigate the antibacterial activity and toxicity for sperm cells of the natural substances gallic acid, methyl gallate, ethyl gallate, propyl gallate, octyl gallate, thymol, carvacrol and eugenol. The antibacterial activity of these natural substances and selected combinations of them against bacterial strains isolated from boar ejaculates was determined using the microdilution and macrodilution method in Mueller-Hinton broth. The most effective natural substances against Gram-negative and Gram-positive bacteria included in our study were thymol and carvacrol with minimum inhibitory concentration (MIC) values in the range of 300-600 µg/ml. Gallic acid exhibited the best antibacterial activity against Pseudomonas aeruginosa strains (MIC values of 300-2400 µg/ml), whereas the ranges of MIC values against Escherichia coli, Enterococcus faecalis and Staphylococcus sp. strains were higher. Octyl gallate exhibited stronger antibacterial activity against staphylococci and enterococci (MIC values of 18.8-75 µg/ml) than against Escherichia coli and Pseudomonas aeruginosa strains with MIC values in the ranges of 300-600 µg/ml and 1200-2400 µg/ml, respectively. Thymol combined with carvacrol was the most effective combination against enterococci (MIC values of 75-300 : 150 thymol : carvacrol) and Pseudomonas aeruginosa (MIC values of 75-300 : 300 thymol : carvacrol), bacteria which are known to be frequently resistant to antimicrobials. Similar results were determined for the combination of carvacrol and eugenol against staphylococci and enterococci. The results of the combinations revealed more of an additive rather than a synergistic effect. Thymol and carvacrol were the most effective natural substances against the bacteria included in this study, with a low toxicity for sperm cells compared to other substances, suggesting their possible use for boar semen decontamination.

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Enhanced functional properties of tannic acid after thermal hydrolysis

Cited by 54 publications

References 24 publications

Gallic acid as the major antioxidant in pequi (Caryocar brasiliense Camb.) fruit peel

Gallic acid as the major antioxidant in pequi (Caryocar brasiliense Camb.) fruit peel

Adsorption of tannic acid on polyelectrolyte monolayers determined in situ by streaming potential measurements

Use of natural substances for boar semen decontamination

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