CHEMICAL COMPOSITION OF BIOLOGICAL ACTIVE EXTRACTS OF Tapirira guianensis (ANACARDIACEAE)

Silva, Eliezer; David, Jorge M.; David, Juceni P.; Garcia, Geisse; Silva, Maísa

doi:10.21577/0100-4042.20170605

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Phytochemical and biological studies have determined that the polyphenols (alkyl ferulates) present in the bark can lead to anti-bacterial, anti-protozoal, and anti-tumoral activities [15,16]. Gallic acid, quercetin, and quercitrin have also been demonstrated no cytotoxicity in flowers or no cytotoxicity when used in an adapted Brine shrimp lethality test [17].…”

Section: Introductionmentioning

confidence: 99%

Polyphenol Composition and Antioxidant Activity of Tapirira guianensis Aubl. (Anarcadiaceae) Leaves

Patient

Jean-Marie

Robinson

et al. 2022

Plants

View full text Add to dashboard Cite

Tapirira guianensis (Anacardiaceae) is a natural resource from the Amazonian Forest and is locally known in French Guiana as “loussé” (creole), “tata pilili” (wayãpi), or “ara” (palikur). The tree is used by indigenous populations for medicinal purposes. To increase the potential of this tree for cosmetic, agro-food, or pharmaceutical uses, extracts were obtained through ultrasound-assisted extraction (UAE) from T. guianensis leaves using various extraction solvents such as water, methanol, and methanol–water (85/15; v/v). Chemical (DPPH, TEAC, ORAC) tests were applied to assess the anti-radical potential of these extracts. The polyphenol contents were determined by spectrophotometric (UV/Visible) and by means of chromatographic (UPLC-DAD-ESI-IT-MSn) methods. Tapirira guianensis leaf hydromethanolic extract produced the highest polyphenol content and exhibited antiradical activities in chemical assays (DPPH, TEAC, and ORAC) similar to (or higher than) those of a well-known antiradical plant, green tea. In T. guianensis, two classes of polyphenols were evidenced: (1) galloylquinic acids (identified for the first time in the studied species) and (2) flavonols and flavanols (present in small amounts). Flavonols seemed to play a major role in the antioxidant activity of DPPH. These findings provide a rationale for the use of T. guianensis in traditional medicine and to pave the way for seeking new biological properties involving this Amazonian tree.

show abstract

Section: Introductionmentioning

confidence: 99%

Polyphenol Composition and Antioxidant Activity of Tapirira guianensis Aubl. (Anarcadiaceae) Leaves

Patient

Jean-Marie

Robinson

et al. 2022

Plants

View full text Add to dashboard Cite

show abstract

“…guianensis (Silva et al, 2020), however, the present study was able to suggest the presence of the compound both in the leaves and in the stem bark of the species, moreover, the antioxidant potential of the extracts can be justified by the presence of the constituent, since there are already several reports on the antioxidant potential of the constituent in the literature.…”

Section: Compoundsmentioning

confidence: 45%

Phenolic profile and antioxidant, anticholinesterase and anti- candida potential evaluation in vitro and in silico studies of Tapirira guianensis Aubl. extracts

Oliveira

Morais²,

Lopes³

et al. 2022

RSD

View full text Add to dashboard Cite

Polar extracts of Tapirira guianensis Aubl. were prepared for evaluation of biological activities. Identification and quantification of phenolic compounds, antioxidant activity, inhibition of acetylcholinesterase enzyme and antifungal potential were performed in all extracts. High contents of total phenols were detected in the ethanolic and aqueous extracts of the leaves (237.10±5.39 mg EAG/g and 346.46±5.67 mg EAG) respectively. The same extracts had a free radical scavenging potential by both DPPH and ABTS+ methods. Ethanolic extract of the leaves with IC50= 15.06±0.02 µg/mL and 16.49±0.01µg/mL) and aqueous extracts (11.54±0.01 µg/mL and 15.14±0.02 µg/mL respectively. In the study by high-performance liquid chromatography the phenolic substances were recorded: gallic acid, rutin, ellagic acid, quercetin and apigenin in the leaves and gallic acid and quercetin in the stem bark. Ethanolic and aqueous extracts of the leaves and stem bark showed high potency of inhibiting the enzyme acetylcholinesterase, with IC50 values = 13.94±0.02 µg/mL, 13.69±0.08 µg/mL and 14.79±0.20 µg/mL respectively. The aqueous extract of the leaves showed anti-Candida action against all four strains of the microorganism. The in silico studies evidenced that all the ligands analyzed presented interaction with the SAP5 protein highlighting the ellagic acid, the rutin and the quercetin. With these results, the activities previously reported for the species T. guianensis are confirmed, highlighting the polar extracts, mainly aqueous as a source of antioxidant, acetylcholinesterase inhibitor and antifungal substances.

show abstract

“…The same authors bring a discussion on how lexical features that should be aimed at a text's target audience may be presented in a complex text, making comprehension more difficult. The important issue of textual and terminological accessibility in different technical-scientific domains has been covered by other recent works of research, aiming at aiding the improvement of accessible text production and the translation of these texts into a foreign language (RODRIGUES; FREITAS; QUENTAL, 2013;MOTTA, 2019;CORTINA SILVA;DELGADO;FINATTO, 2021) In an effort to unveil the factors that could potentially make a corpus of texts written in a given language more or less rhetorically and syntactically elaborate than a corpus in another language, two corpora of 50 MCT-PUCRS texts each have been collected. The first corpus is in Brazilian Portuguese (Portuguese corpus) and consists of 50 texts presented at MCT-PUCRS, accompanying its A comparison of syntactic patterns of Brazilian Portuguese and English: using comparable corpora of museum texts exhibits.…”

Section: Introductionmentioning

confidence: 99%

A comparison of syntactic patterns of Brazilian Portuguese and English: using comparable corpora of museum texts

Tcacenco

Fadanelli

2022

Letras

View full text Add to dashboard Cite

The aim of this paper is to analyze two corpora (one in Brazilian Portuguese and another English), from PUCRS’ Science and Technology Museum, to unveil which of these languages could be rendered to be more or less syntactically and rhetorically elaborate. The corpora were processed on Natural Language Processing tools, such as NILC-Metrix, Coh-Metrix 3.0 and AntConc. Results point to the feature regarding the higher number of words before the main verb as the main factor rendering syntactic and rhetoric elaboration and, consequently, more complexity in the Portuguese corpus.

show abstract

CHEMICAL COMPOSITION OF BIOLOGICAL ACTIVE EXTRACTS OF Tapirira guianensis (ANACARDIACEAE)

Cited by 4 publications

References 0 publications

Polyphenol Composition and Antioxidant Activity of Tapirira guianensis Aubl. (Anarcadiaceae) Leaves

Polyphenol Composition and Antioxidant Activity of Tapirira guianensis Aubl. (Anarcadiaceae) Leaves

Phenolic profile and antioxidant, anticholinesterase and anti- candida potential evaluation in vitro and in silico studies of Tapirira guianensis Aubl. extracts

A comparison of syntactic patterns of Brazilian Portuguese and English: using comparable corpora of museum texts

Contact Info

Product

Resources

About