Structural, textural and morphological characteristics of tannins from Acacia mearnsii encapsulated using sol-gel methods: Applications as antimicrobial agents

Santos, Cristiane dos; Vargas, Álvaro; Fronza, Nei; Santos, João Henrique Zimnoch dos

doi:10.1016/j.colsurfb.2016.11.041

Cited by 43 publications

(22 citation statements)

References 38 publications

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“…They are divided into hydrolyzable (ellagitannins) and condensed tannins (proanthocyanidins) and gallotannins [110]. They have the ability to precipitate macromolecules such as proteins [111] as well as have antimicrobial properties. However, the mechanisms underlying the antimicrobial action of tannins in different microorganisms are still under investigation [111].…”

Section: Phytochemicals: Polyphenols As Substances Most Found In Plantsmentioning

confidence: 99%

“…Two ellagitannins isolated from raspberry (Rubus idaeus L.) fruit, lambertianin C and sanguiin H-6, showed fungistatic activity both in vitro and in situ against Geotrichum candidum [115]. Dos Santos et al [111] verified that encapsulated tannins from Acacia mearnsii have moderate activity against Aspergillus niger (ATCC 9642) and C. albicans (ATCC 34147).…”

Section: Phytochemicals: Polyphenols As Substances Most Found In Plantsmentioning

confidence: 99%

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Phytochemicals and Their Antifungal Potential against Pathogenic Yeasts

Monteiro¹,

Santos²

2020

Phytochemicals in Human Health

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The rate of fungal infections is increasing rapidly, and pathogenesis of their species is poorly understood. Among fungi, Candida species are a major cause of morbidity and mortality worldwide and thus represent a serious threat to public health. In addition, Cryptococcus spp. are yeasts responsible for serious lung infections and meningitis. Polyenes, fluoropyrimidines, echinocandins, and azoles are used as commercial antifungal agents to treat fungal infections. However, the presence of intrinsic and developed resistance against azole antifungals has been extensively documented. The re-emergence of classical fungal diseases has occurred because of the increment of the antifungal resistance phenomenon. In this way, the development of new satisfactory therapy for fungal diseases persists as a major challenge of present-day medicine. The urgent need includes the development of alternative drugs that are more efficient and tolerant than those traditional already in use. The identification of new substances with potential antifungal effect at low concentrations or in combination is also a possibility. This chapter briefly examines the infections caused by Candida and Cryptococcus species and focuses on describing some of the promising alternative molecules and/or substances that could be used as antifungal agents, their mechanisms of action, and their use in combination with traditional drugs.

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Section: Phytochemicals: Polyphenols As Substances Most Found In Plantsmentioning

confidence: 99%

Section: Phytochemicals: Polyphenols As Substances Most Found In Plantsmentioning

confidence: 99%

Phytochemicals and Their Antifungal Potential against Pathogenic Yeasts

Monteiro¹,

Santos²

2020

Phytochemicals in Human Health

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“…The antibiosis determination showed that the extract was more fungicidal (66.67%) than fungistatic (33.33%) [ 53 ]. Cristiane et al [ 54 ] reported that A. mearnsii extract tannin showed antimicrobial activity. Inhibition activities of Aspergillus niger ATCC 9642 (fungus) and Candida sp.…”

Section: Biological Activities Of Wattle Tanninmentioning

confidence: 99%

“…A number of additional investigations on the antimicrobial activity of tannin extracts has been reported. Cristiane et al [ 54 ] reported that A. mearnsii extract tannin showed antimicrobial activity. Inhibition activities of Staphylococcus aureus (gram-positive) were strong.…”

Section: Biological Activities Of Wattle Tanninmentioning

confidence: 99%

“…Results from termite tests showed that the EA and AW had remarkable anti-termite activities. Therefore, Ohara et al [ 54 ] suggested that toxicities of proanthocyanidins as phenolic compounds might be involved in the anti-termite activities of the substances. In 2006, a patent [ 79 ] entitled “Aqueous extract to repel or exterminate termites” was published.…”

Section: Biological Activities Of Wattle Tanninmentioning

confidence: 99%

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Tannins from Acacia mearnsii De Wild. Bark: Tannin Determination and Biological Activities

Ogawa¹,

Yazaki

2018

Molecules

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The bark of Acacia mearnsii De Wild. (black wattle) contains significant amounts of water-soluble components acalled “wattle tannin”. Following the discovery of its strong antioxidant activity, a wattle tannin dietary supplement has been developed and as part of developing new dietary supplements, a literature search was conducted using the SciFinder data base for “Acacia species and their biological activities”. An analysis of the references found indicated that the name of Acacia nilotica had been changed to Vachellia nilotica, even though the name of the genus Acacia originated from its original name. This review briefly describes why and how the name of A. nilotica changed. Tannin has been analyzed using the Stiasny method when the tannin is used to make adhesives and the hide-powder method is used when the tannin is to be used for leather tanning. A simple UV method is also able to be used to estimate the values for both adhesives and leather tanning applications. The tannin content in bark can also be estimated using NIR and NMR. Tannin content estimations using pyrolysis/GC, electrospray mass spectrometry and quantitative 31P-NMR analyses have also been described. Tannins consists mostly of polyflavanoids and all the compounds isolated have been updated. Antioxidant activities of the tannin relating to anti-tumor properties, the viability of human neuroblastoma SH-SY5Y cells and also anti-hypertensive effects have been studied. The antioxidant activity of proanthocyanidins was found to be higher than that of flavan-3-ol monomers. A total of fourteen papers and two patents reported the antimicrobial activities of wattle tannin. Bacteria were more susceptible to the tannins than the fungal strains tested. Several bacteria were inhibited by the extract from A. mearnsii bark. The growth inhibition mechanisms of E. coli were investigated. An interaction between extracts from A. mearnsii bark and antibiotics has also been studied. The extracts from A. mearnsii bark inhibit the growth of cyanobacteria. Wattle tannin has the ability to inactivate α-amylase, lipase and glucosidase. In vivo experiments on anti-obesity and anti-diabetes were also reported. Several patents relating to these enzymes for anti-diabetes and anti-obesity are in the literature. In addition, studies on Acacia bark extract regarding its antitermite activities, inhibition of itching in atopic dermatitis and anti-inflammatory effects have also been reported. The growth of bacteria was inhibited by the extract from A. mearnsii bark, and typical intestinal bacteria such as E. coli, K. pneumoniae, P. vulgaris and S. marcescenes was also inhibited in vitro by extracts. Based on these results, the Acacia bark extract may inhibit not only the growth of these typical intestinal bacteria but also the growth of other types of intestinal bacteria such as Clostridium and Bacteroides, a so-called “bad bacteria”. If the tannin extract from A. mearnsii bark inhibits growth of these “bad bacteria” in vivo evaluation, the extracts might be usable as a new diet...

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