Antioxidant Characterization of Oak Extracts Combining Spectrophotometric Assays and Chemometrics

Popović, Boris M.; Štajner, Dubravka; Ždero, Ružica; Orlović, Saša; Galić, Zoran

doi:10.1155/2013/134656

Cited by 52 publications

(41 citation statements)

References 44 publications

(47 reference statements)

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“…Previous studies confirmed these differences indicating that the presence of polyphenolic compounds is negatively correlated with the antioxidant activities (36). It has been shown that the principle component is the main contributor to the causal effect (37). In this study, the tocopherol content had correlation values with antioxidant activity of R 2 =0.545 and 0.867 with maximum values for inhibition of the peroxyl radical and for expression of anti-inflammatory activities in vitro.…”

Section: Resultssupporting

confidence: 78%

Biological activity of fluidized bed ethanol extracts from several edible mushrooms

Vamanu

Sultana

2014

Food Sci Biotechnol

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In vitro antioxidant and anti-inflammatory activities of fluidized bed ethanol extracts of Pleurotus ostreatus PQMZ91109, PBS281009, M2191 (obtained from a laboratory greenhouse), Agaricus bisporus, Marasmius oreades, Craterellus cornucopioides, and Tuber melanosporum were investigated using free radical scavenging activities, metal chelating effects, inhibition of lipid peroxidation (inhibition of peroxyl radicals), xanthine oxidase, and lipoxygenase, and identification of antioxidant compounds. Levels of different compounds with antioxidant properties demonstrated the presence of more tocopherols than polyphenol carboxylic acids and flavones. HPLC showed that T. melanosporum extracts had high correlation values between levels of different active compounds and antioxidant assay results. Tocopherol levels were highly correlated (R 2 =0.867) with anti-inflammatory activities and inhibition of lipid peroxidation. Fluidized bed ethanol extracts from dried mushroom fruit bodies can be a source of products rich in tocopherols, and can constitute an important ingredient in food supplements.

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Section: Resultssupporting

confidence: 78%

Biological activity of fluidized bed ethanol extracts from several edible mushrooms

Vamanu

Sultana

2014

Food Sci Biotechnol

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“…Catalase content in poultry in trial groups was higher than in control by 45.3-71.9 % (Р  0.05). Antioxidant properties of oak bark extracts [22,23] are also shown in our tests. Increased total antioxidant activity and SOD level in blood of broilers [24,25] were due to feed supplementation with gallic acid, an oak bark component.…”

Section: Introductionsupporting

confidence: 75%

Mixtures of Biologically Active Substances of Oak Bark Extracts Change Immunological and Productive Indicators of Broilers

Фисинин¹,

Ushakov²,

Дускаев³

et al. 2018

S-h. biol.

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A b s t r a c tTo date, numerous studies are focused on searching for alternatives to antibiotics with similar antimicrobial and growth-stimulating effects that do not cause bacterial resistance and potential side effects for animals. Promising phytogenic compounds have been also recognized as potential alternatives to antibiotics in feeds. One of the problems of phytogenic compound use is the unstable chemical composition of plant extracts, depending on the conditions of growth, distribution area and other factors, so the question arises of extracting some substances with the known properties or designing their compositions. In this paper, it has been shown for the first time that a dietary composition of biologically active substances of Quercus cortex helps to maintain productivity and improves the immunomodulating state of Smena 8 poultry cross broilers. In our experiment, a composition of substances (CS) extracted from Quercus cortex and chemically synthesized («Acros Organics B.V.B.A.», Belgium) was used, including 2-n-propylresorcinol (98 %, AVH27024); 4-hydroxy-3methoxybenzaldehyde (99 %, AC14082-1000); 7-hydroxycoumarin (99 %, AC12111-0250); 3,4,5trimethoxyphenol (98.5 %, AC18914-0050); scopoletin (95 %, AC30290-0010); coniferyl alcohol (98 %, AL22373-5) with a confirmed anti-QS effect. A total of 120 broiler chickens aged 7 days were divided into 4 groups (n = 30) by analogue method. Control group was fed with the basic diet (BD). BD + CS 1 (1 ml/kg of live weight), BD + CS 2 (2 ml/kg of lw), and BD + CS 3 (3 ml/kg lw) were used for group 1, group 2, and group 3, respectively. In the experimental groups, as compared to the control, the number of blood leukocytes increased by 19.2-28.5 % (P  0.05), blood lymphocytes were higher by 24.4, 36.2 % (P  0.05) and 44.0 % (P  0.05), blood monocytes were higher by 23.5, 23.5 and 29.4 % (Р  0.05), and blood granulocyte counts were higher by 12.3 % (Р  0.05), 5.7 and 9.5 %. The blood ALT activity in the group 2 and group 3 exceeded the control value by 13.2 % (P  0.05). The level of GGT tended to decrease in the group 2 and group 3, along with a significant decrease in LDH by 17.6-22.5 % (P  0.05). The intake of the CS as a feed additive was accompanied by an increase in blood SOD levels in the test groups, the highest concentration being observed in the group 1 (95.3 %). The catalase indices had similar patterns. Dietary composition of biologically active substances promoted a 16.4 % increase (P  0.05) in blood -lysine levels in the group 1. Within 4 weeks, the dietary CSs led to an increase in the live weight of the poultry of the group 2 and groups 3 by 12.6-15.0 % (P  0.05) when compared to the group 1. In the group 1, the birds grew more rapidly with a 100 % survival rate of the herd, in contrast to the remaining groups with the survival index of 71 to 85 %. These contributed to an insignificant increase in the bird live weight at the end of the experiment (day 42) by 1.9 % (P  0.05) compared to the control group. Thus, feeding broiler chickens with...

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“…Santos et al [29] noted that cork of Quercus super obtained 2.4 -10.6 mg GAE/g DW while twigs and acorns extracts of Quercus robur and Quercus petraea showed 7.44 and 16.25 mg catechin/g DW respectively. Other reports included the total phenolic contents in leaf extracts of Q. robur and Q. petraea ranged from 32 -35 mg catechin/g DW [30] and Quercus resinosa, Quercus laeta, and Quercus obtusata (5.7 -7.1 mg GAE/g DW) [31]. In addition, total phenolic contents in leaf and bark extracts of Q. salicina were higher than some medicinal plants in previous studies such as Aristolochia mollissima, Lobelia chinensis, Dianthus superbus and Centipeda minima (3.9 -5.9 mg/g DW) [32].…”

Section: Discussionmentioning

confidence: 99%

Antioxidant Capacity and Phenolic Contents of Three <i>Quercus</i> Species

Tuyen

Khang

et al. 2016

ILNS

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ABSTRACT. The antioxidant capability and phenolic contents of ethanol extracts (free phenolics) and ethyl acetate extracts (bound phenolics) of three Quercus species were estimated in this work. The antioxidant activities were examined by 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) free radical, reducing power and -carotene bleaching methods. HPLC was employed to detect major phenolic acids. The leaf extract of Q. salicina contained maximum total phenolics while the highest total flavonoid content was found in the leaf extract of Q. serrata. The antioxidant activities varied among three species. Bark extract of Q. salicina was the most potential and it was closed to levels of the standard antioxidative dibutyl hydroxytoluene (BHT). The bark extract of Q. serrata also showed promising antioxidant activities despite their eminence was negligibly lower than Q. salicina. Stronger antioxidant activities of free phenolics than those of the bound phenolics may be attributed to higher quantities of free phenolics in the barks of Quercus species, however total flavonoids may not contribute a critical role. By HPLC analysis, thirteen phenolic acids were detected in the leaf and bark extracts. Of them, Q. salicina showed maximum in number (ten compounds) and quantities of detected phenolic acids. Ellagic, chlorogenic and benzoic acids were dominant in Quercus species. Findings of this study revealed that leaves and barks of three Quercus species are rich source of antioxidants, and Q. salicina is the most promising and should be elaborated to exploit its pharmaceutical properties.

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Antioxidant Characterization of Oak Extracts Combining Spectrophotometric Assays and Chemometrics

Cited by 52 publications

References 44 publications

Biological activity of fluidized bed ethanol extracts from several edible mushrooms

Biological activity of fluidized bed ethanol extracts from several edible mushrooms

Mixtures of Biologically Active Substances of Oak Bark Extracts Change Immunological and Productive Indicators of Broilers

Antioxidant Capacity and Phenolic Contents of Three <i>Quercus</i> Species

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