Tìm thấy 17+ kết quả cho từ khóa "Phenolic compound"
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The properties of the high purity (99%) phenolic compounds purchased from Sigma-Aldrich are summarized in the Table 5.. Properties of the phenolic compounds used in this work. To determine the capacity of removing phenolic compounds in the production of treated water, a method based on the detection of a contamination of the permeate is often used. It consists of doping the feed with the compound selected and controlling the phenolic compound concentration on both sides of the membrane.
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Reproducibility and accuracy of the method were checked by spiking standards to a solution containing samples at a concentration of 10 mg mL –1 of each phenolic compound. The reproducibility and the accuracy of the method were measured from 10 replicate injections. Linearity of the HPLC–DAD system was evaluated by using the least square method. The linearity of the method was very good for all standards..
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As recently reported, the toxicity of phenolic compounds can be explained by the uncoupling of ATP biosynthesis in mitochondria and can be predicted by a bivari- ate model, depending on the acid dissociation constant (pK a ) and the 1-octanol/water partition coefficient (K ow ) of the phenolic compound ( Ventura et al., 2020. Basidiomycetes are reportedly very effective in the biodegradation of lignin, a macromolecule with a myriad of phenolic groups.
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Total phenolic content in the 95% ethanol and 50% acetone fractions I-V were measured.. No signals of phenolics were detected in the fractions V of both 95% ethanol and 50%. Similarly, the fraction I of acetone eluent also exhibited highest total phenolic content (189.8 μgGAE/mL) and then decreased in the following fractions (fig. Since the phenolic content was not detected in the fraction V, 250 mL of eluent is sufficient enough to elute maximum phenolic compounds from the column..
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Meanwhile, Phenolic compounds in foods cause different variations in organoleptic qualities like taste, bitterness. and color properties are altered with phenolic compounds and anthocyanins. On the other hand, the importance and beneficial effects of phenolic compounds have increased by passing day (Nizamlioglu and Nas, 2010). Where, Phenolic compounds from plant sources are categorized into two groups as ‘‘phenolic acids’’ and.
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Fraction C16 (4.2 g) was rechromatographed, eluted with petroleum ether-chloroform (5:5) to give the compound 2 (15.0 mg). and chloroform-methanol (98:2) to afford compound 1 (15.7 mg).. After termination by diluted acetic acid in MeOH, the reaction mixture was concentrated in vacuo, and the residue was purified by preparative TLC (n-hexane-Et 2 O, 2:8) to yield compound 1a (4.1 mg)..
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Comparison of total phenolic and antioxidant activity of different Mentha spicata and M. longifolia Antioxidant activity Phenolic compound. This study investigated total phenolic and antioxidant activity of five Iranian mint accessions from two different species, Mentha spicata L. The content of total phenolics (mg tannic acid equivalent per g dry weight of the sample) differed from 50.1 in Mzin3 to 67.2 in Mzin6.
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Our previous phytochemical study on the lichen Parmotrema tsavoense (Duong 2015) led to the isolation of new phenolic compounds such as depsidones and diphenyl ethers. In this paper, we reported the isolation of one new compound, methyl (E)-2,4- dihydroxy-6-methyl-3-(3-oxobut-1-en-1-yl)benzoate (1), together with two known ones, atranol (2), 2-O-methylatranol (3), from the lichen Parmotrema tsavoense. Parmotrema tsavoense (Krog &. Parmotrema tsavoense on rock.
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Rosmarinic acid, as a natural phenolic compound, showed effectiveness in inhibition of both hCA isoenzymes’ activities in the low micromolar range. In The Carbonic Anhydrases: New Horizons. In The Carbonic Anhydrases: Cellular Physiology and Molecular Genetics
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On the other hand, the fermentation and roasting process which was applied to rambutan seed could improve the antioxidant activity and increase the total phenolic compound of rambutan seed fat (RSF) [23]. The aim of this study was to investigate color, phenolic compounds and radical scavenging activity of rambutan seed fat (RSF) and its mixture with cocoa butter (CB)..
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With respect to total phenolic compounds, the fermentation time increased to a maximum of 88.8 ppm at the end of the fermentation time of both KFRS and KFBS, whereas KFTS gave 88.8 ppm of the highest phenolic compound after 8 days of fermentation, which was more than 3 times of the KFRS (lowest, 26.11 ppm).
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This result showed that phenolic compound may be contributed to the antioxidant activity (Barreira et al., 2008. Sousa et al., 2008). however Hatamnia et al. Also total phenolic content (in exocarp layer) had a negative and significant correlation with protein, K, N, and P contents (in seed). The first five principal components represented 73.72% of the total variance (Table 5).
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Classification and structure of the major phenolic compounds (Adapted from Han et al., 2007). Phenolic compounds compoundscompounds. Complex between phenolic compounds and metals (Me n. (Leopoldini et al., 2011). Xanthine oxidase, in the reperfusion phase (i.e., reoxygenation), catalyses the reaction between xanthine and molecular oxygen, releasing superoxide free radicals and uric acid (Nijveldt et al., 2001).. Relation between phenolic structure and antioxidant capacity of phenolic compounds.
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The higher TPC concentration in Tibetan wild barley may be partially attributed to more ferulic acid,. which is one of the major phenolic acids in barley grain.. Cur- rently, whether higher TPC in wild barley is also contributed by other phenolic compound is not clear. In addition, Tibetan wild barley contained higher AOA than cultivated barley.
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The highest organic acid content was obtained from the jujube fruits at YM stage.. e) In the jujube fruit, the major sugars were glucose and fructose at the GM stage, whereas the sucrose was the major sugar at the RM stage.. f) The jujube fruit is a very rich fruit in terms of phenolic compounds, and its phenolic compound composition changed with the maturation. h) Total phenolic content and antioxidant capacity of the jujube fruit decreased with the maturation..
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Two Indole Devatives and Phenolic Compound Isolate from Mushroom Phellinus linteus. Acidic polysaccharides isolated from Phellinus linteus induce. Antioxydant, Cytotoxyc Antimalarial Actiivites from crude extracts of Mushroom Phellinus linteus. Antitumor Polysaccharides from some polyproraceae, Ganoderma applanatum (pers.) Pat and Phellinus linteus (Berk. Et Curt) Aoshima. THE ANTIOXIDANT CAPACITY OF PHELLINUS LINTEUS MUSHROOMS ( Phellinus linteus ( Berk . Et Curt.
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The statement was supported by Turkmen et al., (2006) who report that the change of polarity of the solvent can change the ability of the solvent to solve the phenolic compound. This is because the ability and properties of the solvent in dissolving phenolic compounds are different, depending on the degree of polarity of the solvent and the extracted compound (Suryani et al., 2016)..
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Significant differences were observed in the total phenolic content and antioxidant activities of the root, stem, seed, and leaf parts of A. The order of the total phenolic content of A.. Good positive correlations were observed between the results of the phenolic content and antioxidant assays (ABTS. DPPH•, and FRAP. In this study, the antioxidant activity of A. Total phenolic content and antioxidant activity of root, stem, seed, and leaf extracts and root essential oil of A..
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Single crystals of HL1ox were obtained from slow evaporation of an acetone solution of the compound. The molecular structure of the compound in the solid state was determined by XRD study. The molecular structure of the compound is solved in the monoclinic crystal system and P2 1 /c space group. The molecular structure of the compound is given in Figure 3.. The bond lengths of diazo (N2= N3) and azomethine (C1=N1) groups in the compounds are 1.275(12) and 1.234(11) Å, respectively.
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