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Total phenols

Tìm thấy 15+ kết quả cho từ khóa "Total phenols"

Evaluation of the antioxidant activity and dosage of polyphenols in aqueous, hydroethanolic and hexane extracts of the bark of Spathodea campanulata P. Beauv. (Bignoniaceae)

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First of all, as for the determination of total phenols, it can be observed a blue color after adding Folin-Ciocalteu reagent, which confirms the presence of total phenols in the various extracts of S. The highest content of phenols was found in the hydro-ethanolic extract, with a value equal to 10.17 mg GAE / g DE, followed by the hexane and aqueous extracts respectively 7.64 and 4.44 mg GAE / g DE.

Seasonal variations effect on antioxidant compounds and their role in the adaptation of some halophytes at Wadi Gharandal, Southwest Sinai

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Correlation Glycine betaine Halophytes Total phenols. The impact of seasonal variations on lipid peroxidation in terms of malondialdehyde (MDA) content, and con- tents of chlorophyll a and b, carotenoid, ascorbic acid content, proline content, glycine betaine content and total phenols content were assessed in seven halophytic representative species, viz., the shoot system of Halocnemum strobilaceum (Pall.) M.

Otential, phenolic content, and structural mechanical properties of pear jam enriched with fibers

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The antioxidant activity (ABTS and CUPRAC methods) and the content of total phenols were preserved to the greatest extent when the fruit jam was irradiated with ultraviolet light for 10 minutes compared to the control sample (P00). http://dx.doi.org/10.3390/app10165458.

Effect of freezing on the pungency and antioxidants activity in leaves and bulbs of green onion in Giza 6 and Photon varieties

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Results showed high contents of total phenols and flavonoids in leaves compared with bulbs either of Giza 6 or Photon types, therefore Giza 6 had high content of total phenols and flavonoids than Photon variety, in parallel the results were obtained of total chlorophyll and total carotenoids con- tents. While, chlorophyll a content showed higher than chlorophyll b in leaves than in bulbs for each variety.

Physiological and transcriptomic analyses reveal the roles of secondary metabolism in the adaptive responses of Stylosanthes to manganese toxicity

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Compared to their respective controls, the levels of total phenols, tannins and anthocyanidins in stylo leaves increased with 400 and 800 μM Mn treatments, while the concentrations of flavonoids increased with Mn treatments increasing from 200 to 800 μM, peaking at 800 μM (Fig. Fur- thermore, the concentrations of total phenols, flavo- noids, tannins and anthocyanidins in stylo leaves subjected to 400 μM Mn treatment were increased and 7.4-fold, respectively, compared with their controls (Fig.

Impact of UV-B radiation on some biochemical changes and growth parameters in Echinacea purpurea callus and suspension culture

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As for the interaction, the highest significant total phenols were observed by using 2 UV-B lamps for 2 h exposure time then incubated for 2 weeks (5.17 mg/g D.Wt).. Impact of UV-B radiation on some biochemical changes and growth parameters 213. for 4 h exposure time then incubated for one week recorded the highest total phenols (6.63 mg/g D.Wt).. In the same manner Cuadra et al.

Enhancement of quality attributes of canned pumpkin and pineapple

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The obtained results indicate that the total sugars, ash, total phenols, total caroteno- ides and ascorbic acid contents of flesh pumpkin and pineapple were (62.16% and 78.49. and 2.21. Results indicate that total soluble solids, total sugars, total phenols, total carotenoids and ascorbic acids of canned pumpkin and pineapple were ranged from 17.1% to to to to 1.27% and ascorbic acid 88.19 to 210.53 mg/100 g on dry weight basis.

The protective role of melatonin under heavy metal-induced stress in Melissa Officinalis L

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The content of total phenolic compounds in the leaves is three to six times higher than in the roots. According to Tukey test, the differences in the content of total phenols in ethanol extracts of the lemon balm root in all treatments were clearly observed.

Effects of microwave heating on the antioxidant activities of tomato (Solanum lycopersicum)

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For total phenols concentration, our results are higher than those obtained by other authors (George et al., 2004) on fresh tomatoes with. Moreover, values obtained by our experiments showed also higher values for fresh tomatoes than those reported in the literature ranged from 0.154 to 0.162 mg GAE/g FM (Riahi and Hdider, 2013), and with total phenols of 0.14 mg GAE/g FM (Brat et al., 2006), and varied from 0.6 to 0.9 mg GAE/g FM (Aldrich et al., 2010).

Antiatherogenic properties of vegetable juice rich in antioxidants in cholesterol-fed rats

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Abstract Vegetable juice was prepared from a mixture of tomato, watercress, parsley, carrots, cel- ery, lettuce, beets and spinach and analyzed for its antioxidant content and activity (total phenols, total flavonoids, carotenoids, chlorophyll A and B, vitamins C and E) and minerals. As well as anti- atherogenic effects of vegetable juice on Wister rats fed on high fat diet was studied.

Effect of maltose and trehalose on growth, yield and some biochemical components of wheat plant under water stress

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The obtained results were in harmony with the finding of Aldesuquy and Ghanem (2015), drought stress on wheat culti- vars elevated total phenols and flavonoids, also trehalose increased total phenols and flavonoids. These compounds involve in scaveng- ing of reactive oxygen species (ROS) through the antioxidative enzymes which use polyphenols as substrates (Sgherri et al., 2003).

Evaluation of rhizobacteria of some medicinal plants for plant growth promotion and biological control

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Table 4 Siderophores and total phenols produced by the selected isolates obtained from medicinal plants and their antagonistic effect against two pathogenic fungi.. (Silini et al., 2012) reported that phosphate solubilization by rhizobacterial isolates has been shown to be related to the Fig. This study illustrates that rhizospheric bacteria of medicinal plants have multiple PGPR traits.

Effect of storage of Halaweh tahinia on physicochemical and nutraceutical properties

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The time of storage of Halawa tahinia has an effect on total phenols reduction and no effect was recognized due to storage temperature var- iation. after processing and storage for 7 months at 20 °C (Poiana et al., 2012). There was a reduction in the antioxidant content of strawberry purees during storage at 6 °C and 22 °C for 16 weeks (Aaby et al., 2007).

Physiological and biochemical studies on drought tolerance of wheat plants by application of amino acids and yeast extract

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In both seasons, results in Table 4 indicate that water stress levels significantly affected on total soluble sugars (TSS), total carbohydrates (TC), total free amino acids (TAA) and total phenols (TP). Zhang et al. Yeo et al. These Physiological and biochemical studies on drought tolerance of wheat plants by biostimulants application 139. Water stress Biostimulants Chl. Total free amino acids (mg/g D.W.). (2007) and Maria et al.

Oxidative stability of ghee as affected by natural antioxidants extracted from food processing wastes

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A wide range of phenolic compounds have been identified in virgin oil (Suarez et al., 2010) wherein only ca. 2% of the total phenols found in olive fruits are transferred to the extracted olive oil.. The rest of phenolic compounds (98%) are retained in the olive waste cake. Pomegranate has been used extensively in the folk medicine of many cultures and its consumption has grown tre- mendously especially in the last decades (Li et al., 2006. Cam et al., 2009).

Antioxidant, cytotoxicity and anti-tumor activity of Cordia dichotoma fruits accompanied with its volatile and sugar composition

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Total phenols concentrations were expressed as mg gallic acid/g extract, whereas total flavonoids of CDFP-extract was determined using the aluminum chloride according to the method described by Lin and Tang (2007) and was expressed as mg quercetin/g extract. Sugars content of CDFP-extract 2.3.1. Estimation of antioxidant properties of CDFP-extract 2.4.1. Total antioxidant capacity of CDFP-extract was measured using the methods explained by Miller and Rice-Evans (1997) and Arnao et al..

Chapter 10: ALCOHOLS-PHENOLS

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NOMENCLATURE OF PHENOLS. PREPARATION OF PHENOLS. REACTIONS OF PHENOLS. Polar solvent. Non-polar solvent. O-acylations of phenols. Preparation of aryl ethers. Can NOT prepare aryl ether directly from the reaction of phenol &. of acid catalyst. Cleavage of aryl ethers by hydrogen halides. Oxidation of phenols

Disposable carbon electrodes as an alternative for the direct voltammetric determination of alkyl phenols from water samples

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Comparative results obtained by the developed DPV on PGE and a HPLC method for the determination of the total content of alkyl phenols in water samples collected from 2 different plants.. The present paper describes the performance of cheap and commonly available disposable PGEs for the determination of total content of APs in water samples at micromolar levels.

Total Quality Human Resources Management

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Total Quality Human Resources Management. Total quality human resources management (TQHRM) is “an approach to human resources management that involves many of the concepts of quality management.” The primary goal of TQHRM is employee empowerment. Several resources are available on the topic of total quality human resources management. “Human Resources Management in a Total Quality Environment: Shifting from a Traditional to a TQHRM Approach.” Journal of Quality Management 1, no

Bang Gia Ban Total - T6

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