Characterization of Bark Rich-in-Tannins Extracts From Deciduous Trees With Emphasis on Their Antioxidant Activity

Janceva, Sarmīte; Dizhbite, Tatiana; Vēvere, Laima; Arshanitsa, Alexandr; Телышева, Галина; Dzenis, Mārcis

doi:10.1088/1757-899x/111/1/012013

Cited by 3 publications

(5 citation statements)

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“…It is known that the bark of wood and wood processing waste, in particularly wood bark, are richest source of biological active compounds which are under thorough investigation all over the world [9][10][11]. Many of them can effectively influence the efficiency of α-amylase [12][13].…”

Section: Fig1 Enzymatic Digestion (Initial Stage) Of Polysaccharidesmentioning

confidence: 99%

“…were studied. Hydrophilic extracts of deciduous bark showed high biological activity [9]. For many years, the bark of deciduous trees has been used in folk and traditional medicine.…”

Section: Fig1 Enzymatic Digestion (Initial Stage) Of Polysaccharidesmentioning

confidence: 99%

“…The review of the literature data and our investigations shows that the oligomeric PACs are highly active compounds with a wide spectrum of biological activity, which is conditioned by their polyphenolic structure [9]. PACs have antioxidant, antimutagenic, anticarcinogenic, antiinflammatory and antiviral properties [17].…”

Section: Fig1 Enzymatic Digestion (Initial Stage) Of Polysaccharidesmentioning

confidence: 99%

“…Materials Science and Applied Chemistry IV Radical scavenging activity of extracts. Extracts were tested for their radical scavenging activity against the DPPH˙ assay [9]. Free radical scavenging activity was expressed as the concentration of antioxidant, mg L −1 , required for a 50% inhibition of the free radical (IC50).…”

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confidence: 99%

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Influence of Extracts from Bark of Deciduous Trees on the Activity of the Amylolytic Enzyme - Alpha Amylase

Janceva

Andersone

Lauberte

et al. 2021

KEM

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The effect of water extracts obtained from bark of growing in Latvia and widely spread in Europe grey alder (Alnusincana), black alder (Alnusglutinosa) and aspen tree (Populustremula), on the amylase activity in human saliva was evaluated. The extracts were obtained using advanced ACE equipment and distilled hot water as a solvent. The total yields of extractives from bark were rather similar and varied from 16 % to 21 % based on dry bark. However, the content of proantocianidine and salicine derivatives used as diagnostic characteristic for evaluation of effect of extracts on activity of amylase – a glucose-polymers cleavage enzyme - differed significantly. The results of in-vitro tests realized using the model of human gastrointestinal pass have shown that the abovementioned extracts in micro dosages are able to increase significantly activity of amylase. However, this effect is dose dependent and when the dose is exceeded the opposite effect – inhibition of amylase activity - is observed. This effect is explained by increasing of proantocianidins component in the volume of the tested extract dose, because pure proantocianidins, isolated from grey alder bark significantly inhibited activity of amylase. The further investigation is necessary in order to estimate effective and safe dosages for application of extracts providing a guaranteed unambiguous effect of activation or inhibition of amylase activity.

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Section: Fig1 Enzymatic Digestion (Initial Stage) Of Polysaccharidesmentioning

confidence: 99%

“…were studied. Hydrophilic extracts of deciduous bark showed high biological activity [9]. For many years, the bark of deciduous trees has been used in folk and traditional medicine.…”

Section: Fig1 Enzymatic Digestion (Initial Stage) Of Polysaccharidesmentioning

confidence: 99%

Section: Fig1 Enzymatic Digestion (Initial Stage) Of Polysaccharidesmentioning

confidence: 99%

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confidence: 99%

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Influence of Extracts from Bark of Deciduous Trees on the Activity of the Amylolytic Enzyme - Alpha Amylase

Janceva

Andersone

Lauberte

et al. 2021

KEM

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“…A higher amount of tannins has been linked to increased durability of wood to degradation (Reinprecht, 2016; Scalbert, 1992). Tannin types (size, structure, solubility, color) and their concentration vary both between species and in wood from the same species growing in different locations (Janceva et al, 2016; Puech et al, 1999; Scalbert, 1992). Similarly, different parts of a wood (e.g., inner or outer heartwood and sapwood) have been found to contain different tannins in variable concentrations due to age‐related variability (Brennan et al, 2020; Puech et al, 1999; Scalbert, 1992).…”

Section: Resultsmentioning

confidence: 99%

Histological and stable isotope analysis of archeological bones from St. Rombout's cemetery (Mechelen, Belgium): Intrasite, intraindividual, and intrabone variability

Kontopoulos

Vijver

Robberechts³

et al. 2022

Intl J of Osteoarchaeology

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This study compares histological preservation in archeological bones from different burial types to unravel the histotaphonomy-to-funerary practices relationship. Αn intraskeletal approach is also adopted to explore intraindividual (inner ear part of the petrous bone vs. upper/lower limb long bones) and intrabone (proximal vs. distal diaphysis) variability in bone collagen preservation, δ 13 C, and δ 15 N. The aim is to (a) target bones that likely retain higher amounts of collagen, (b) better understand the inner ear bone collagen isotopic signature and remodeling, and (c) assess intrabone isotopic and histological homogeneity. For the histological analysis, the data have been collected from 61 specimens (20 individuals) from the medieval/ postmedieval cemetery of St. Rombout, Belgium. Thin sections have been studied using optical and scanning electron microscopy. For the collagen and isotopic data, 101 samples have been collected from 21 individuals. Distinct histological patterns are observed only in bones from single coffin burials; however, bone histology can display intraindividual and intrabone variability, which are important to account for interpretations. Collagen wt.%, δ 13 C, and δ 15 N show significant intraindividual differences but insignificant intrabone variability. This study also confirms the extraordinary nature of the petrous bone, as the inner ear bone collagen δ 13 C and δ 15 N values reflect the dietary input of the first approximately 2-3 years of life.

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Protective effects of proanthocyanidins extracts from the bark of deciduous trees in lipid systems

et al. 2017

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Oligomeric proanthocyanidins (OPC) rich extracts (OPCEs) were isolated by sequential extraction from the bark of the deciduous trees grey alder (Alnus incana), black alder (Alnus glutinosa) and goat willow (Salix caprea). The yields of OPCE from all barks under study were rather similar and varied between 12.3% and 15.4% based on the oven dry (o.d.) bark. Content of proanthocyanidins in OPCEs ranged from 16.6% to 25% based on o.d. extract. The OPCEs were characterised by means of antioxidant activity with ABTS˙+ and DPPH˙ radical scavenging tests. All extracts being introduced into lipid-based substrates, i.e. mayonnaise and a basic composition of a cosmetic cream, showed antioxidant activity comparable to the reference commercial antioxidant tert-butylhydroquinone (TBHQ). The results of in vitro tests have revealed that the OPCEs could be useful for the human organism as they activated malfunctions of amylase, inhibited pancreatic lipase activity (duodenal digestion model), decreased lipid absorption in blood and decreased pyruvate level in blood plasma essential for regulation of carbohydrate metabolism. The data obtained confirms the advantages of OPC and OPCEs applications as an antioxidant additive for food, cosmetic and health industries.

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Characterization of Bark Rich-in-Tannins Extracts From Deciduous Trees With Emphasis on Their Antioxidant Activity

Cited by 3 publications

References 3 publications

Influence of Extracts from Bark of Deciduous Trees on the Activity of the Amylolytic Enzyme - Alpha Amylase

Influence of Extracts from Bark of Deciduous Trees on the Activity of the Amylolytic Enzyme - Alpha Amylase

Histological and stable isotope analysis of archeological bones from St. Rombout's cemetery (Mechelen, Belgium): Intrasite, intraindividual, and intrabone variability

Protective effects of proanthocyanidins extracts from the bark of deciduous trees in lipid systems

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