Free-Radical Analysis on Thermochemical Transformation of Lignin to Phenolic Compounds

2012 ◽  
Vol 27 (1) ◽  
pp. 285-293 ◽  
Author(s):  
Jun Hu ◽  
Dekui Shen ◽  
Rui Xiao ◽  
Shiliang Wu ◽  
Huiyan Zhang
Keyword(s):  
Free Radical ◽  
Phenolic Compounds ◽  
Thermochemical Transformation

scholarly journals Free Radical-Scavenging Capacities, Phenolics and Capsaicinoids in Wild Piquin Chili (Capsicum annuum var. Glabriusculum)

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2655 ◽  
Author(s):  
Yolanda Moreno-Ramírez ◽  
Guillermo Martínez-Ávila ◽  
Víctor González-Hernández ◽  
Cecilia Castro-López ◽  
Jorge Torres-Castillo
Keyword(s):  
Free Radical ◽  
Phenolic Compounds ◽  
Radical Scavenging ◽  
Natural Populations ◽  
Free Radical Scavenging ◽  
Chemical Diversity ◽  
Total Phenolic ◽  
Total Phenolic Compounds ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity

The total phenolic compounds content, free radical-scavenging capacity and capsaicinoid content in populations of wild Piquin chili (C. annuum) were studied. Aqueous and hydroalcoholic extracts from nine ecotypes were evaluated. High contents of phenolic compounds and free radical-scavenging capacities were observed for both extracts; however, the values that were found for the hydroalcoholic phase were substantially higher. LC-MS analysis allowed for the detection of 32 compounds, where apigenin-8-C-glucoside followed by vanillic acid 1-O-β-o-glucopyranosylester (Isomer I or II) and 7-ethoxy-4-methylcoumarin were the most widely distributed; they were found in more than 89% of the ecotypes. The diversity of identified phenolic compounds was different among ecotypes, allowing them to be distinguished by chemical diversity, free radical-scavenging capacities and heat Scoville units. The total capsaicinoid content was higher in Population I (23.5 mg/g DW) than in Populations II and III, which had contents of 15.3 and 10.7 mg/g DW, respectively. This variability could lead to phytochemical exploitation and the conservation of the natural populations of wild chili.

scholarly journals Antioxidant activity and total phenol content of blackberries cultivated in a highland tropical climate

2017 ◽  
Vol 39 (1) ◽  
pp. 43 ◽  
Author(s):  
Mayara Neves Santos Guedes ◽  
Rafael Pio ◽  
Luana Aparecida Castilho Maro ◽  
Fabíola Fonseca Lage ◽  
Celeste Maria Patto de Abreu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Phenolic Compounds ◽  
High Performance ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Total Phenol ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Phenolic Contents

Blackberries are an important option for the diversification of fruit crops. However, there is currently no literature regarding plant cultivation in high-altitude tropical climates. Knowledge of the phenolic composition of blackberries is essential because variations in the levels of these components may exist between cultivars and may depend on environmental conditions. High performance liquid chromatography (HPLC) was used to evaluate the total phenol content of different blackberry cultivars (Arapaho, Brazos, Cainguangue, Cherokee, Choctaw, Comanche, Ébano, Guarani, Tupy and Xavante). Free radical scavenging activity in these cultivars was assayed using a DPPH test. The HPLC-UV chromatogram of blackberry fruit extracts at 280 nm revealed the presence of phenolic compounds. The results showed significant differences in the levels of phenolic compounds in the blackberry cultivars tested. Antioxidant activity was evaluated using the ABTS free radical and ranged from 2.7 ± 0.1 to 19 ± 2 μmole of Trolox equivalents per gram of sample (b.u.). These results are in good correlation with the phenolic contents of the blackberries tested. The Xavante blackberry cultivar had the highest levels of polyphenols that could be individually identified. Catechin polyphenols were found to be the main component in the blackberry varieties tested. 

scholarly journals Comparative Study on Phytochemical Profiles and Antioxidant Capacities of Chestnuts Produced in Different Geographic Area in China

Antioxidants ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 190
Author(s):  
Ziyun Xu ◽  
Maninder Meenu ◽  
Pengyu Chen ◽  
Baojun Xu
Keyword(s):  
Free Radical ◽  
Phenolic Compounds ◽  
Phenolic Acids ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Total Phenolic ◽  
Antioxidant Power ◽  
Mean Values ◽  
Antioxidant Capacities ◽  
Free Phenolic Acids

This study aimed to systematically assess the phenolic profiles and antioxidant capacities of 21 chestnut samples collected from six geographical areas of China. All these samples exhibit significant differences (p < 0.05) in total phenolic contents (TPC), total flavonoids content (TFC), condensed tannin content (CTC) and antioxidant capacities assessed by DPPH free radical scavenging capacity (DPPH), ABTS free radical scavenging capacities (ABTS), ferric reducing antioxidant power (FRAP), and 14 free phenolic acids. Chestnuts collected from Fuzhou, Jiangxi (East China) exhibited the maximum values for TPC (2.35 mg GAE/g), CTC (13.52 mg CAE/g), DPPH (16.74 μmol TE/g), ABTS (24.83 μmol TE/g), FRAP assays (3.20 mmol FE/100 g), and total free phenolic acids (314.87 µg/g). Vanillin and gallic acids were found to be the most abundant free phenolic compounds among other 14 phenolic compounds detected by HPLC. Overall, the samples from South China revealed maximum mean values for TPC, CTC, DPPH, and ABTS assays. Among the three chestnut varieties, Banli presented prominent mean values for all the assays. These finding will be beneficial for production of novel functional food and developing high-quality chestnut varieties.

scholarly journals Free Radical Scavenging Activity, Reducing Power and Anti-Hemolytic Capacity of Algerian Drimia maritima Baker Flower Extracts

2020 ◽  
Vol 10 (4) ◽  
pp. 70-78
Author(s):  
Abir Rezzagui ◽  
Abderrahmane Senator ◽  
Soumia Benbrinis ◽  
Hamama Bouriche
Keyword(s):  
Lipid Peroxidation ◽  
Free Radical ◽  
Phenolic Compounds ◽  
Superoxide Anion ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Free Radical Scavenging ◽  
Scavenging Activity

This study was undertaken to evaluate the antioxidant and anti-hemolytic properties of Algerian Drimia maritima Baker flower extracts. Determination of phenolic content was carried out to estimate the chemical composition of D. maritima extracts. Antioxidant properties were investigated in all extracts using free radical scavenging activity (against DPPH, ABTS, hydroxyl radical, and superoxide anion), reducing power, inhibition of lipid peroxidation, and anti-hemolytic capacity. Phenolic determination revealed that D. maritima flowers contain phenolic compounds, flavonoids, and tannins. Ethyl acetate extract showed the highest reducing power and scavenging activity using DPPH and ABTS assays. However, aqueous extract was the most effective against hydroxyl radical, superoxide anion, and lipid peroxidation. The half-time of hemolysis indicates that chloroform extract exhibited the best anti-hemolytic capacity in the AAPH induced hemolysis model. The results of this study suggest that D. maritima could be used as a possible source of antioxidant phenolic compounds and that further determination of these compounds may provide more information on their medicinal value.  Keywords: Drimia maritima, phenolic compounds, scavenging activity, reducing power, anti-hemolytic.

scholarly journals The study of influence of the extracts obtained from prunus domestica fruits on lipid peroxydation and antioxidant system indicators in liver

2019 ◽  
pp. 85-93
Author(s):  
Bashar Jabbar Ali Al-Sahlanee ◽  
I. V. Senyuk ◽  
L. V. Lenchyk ◽  
T. V. Upyr
Keyword(s):  
Lipid Peroxidation ◽  
Free Radical ◽  
Phenolic Compounds ◽  
Effective Dose ◽  
Rat Liver ◽  
Antioxidant System ◽  
Antioxidant Properties ◽  
Diene Conjugates ◽  
Reference Drug ◽  
Wide Range

The study of pharmacological properties and experimental substantiation of application possibilities of the plum fruits extracts in the treatment of the gastrointestinal tract and hepatobiliary system diseases is relevant, because plum is source of phenolic compounds with a wide range of action and is used in folk medicine for treating diseases of digestive system. The aim of the present work was an experimental study of anti free radical activity by lipid peroxidation indicators and antioxidant properties by the antioxidant system (AOS) indicators of two Plum extracts, detecting the most effective extract and determining its effective dose. The objects of research were extracts obtained from the fresh plum fruits: plum extract containing fibers (PEF) and extract containing plum polysaccharide complex (PEPC). Research methods: pharmacological (modeling of alcoholic damage to rat liver), biochemical (determination of the level of diene conjugates, TBA-AP, lipid hydroxyperoxides, reduced glutathione and α-tocopherol in rat liver homogenate) and statistical (using the program «Statistica 6.0», Student’s t-test). Experimental data on the study of the anti free radical properties of the plum extracts showed inhibitory effects on lipid peroxidation, reducing the content of diene conjugates, TBAs, and lipid hydroxyperoxides under conditions of alcoholic liver damage. Regarding the effect of the investigated extracts on the markers of the antioxidant system of hepatocytes, there was an increase in the content of reducing glutathione and α-tocopherol on the alcoholic hepatitis model. The fiber-containing extract (PEF) was the most effective in normalizing the functional state of the liver at a dose of 200 mg/kg. Thus, it was determined that an effective dose of extract with fibers (PEF) was 200 mg/kg. The investigated effects of PEF in 200 mg/kg exceeded the effects of PEPS at the tested doses and were at the level of activity of reference drug «Silibor» in the dose of 25 mg/kg. Anti free radical and antioxidant properties of the PEF are probably related to its chemical composition namely phenolic compounds (anthocyanins and hydroxycinnamic acids). Considering the results of screening, the most promising subject for further in-depth pharmacological study is plum extract PEF at dose 200 mg/kg.

scholarly journals Comparison of ABTS, DPPH, Phosphomolybdenum Assays for Estimating Antioxidant Activity and Phenolic Compounds in Five Different Plant Extracts

2018 ◽  
Vol 75 (2) ◽  
pp. 110
Author(s):  
Arabela UNTEA ◽  
Alexandra LUPU ◽  
Mihaela SARACILA ◽  
Tatiana PANAITE
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Phenolic Compounds ◽  
Phenolic Content ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Total Phenolic ◽  
Scavenging Activity ◽  
Total Phenols ◽  
Walnut Leaves

Many plants and their constituents (carotenoids, flavonoids and other phenolic compounds), action to inhibit the free radical by the use of antioxidant activity, helping to a better efficiency of nutrients utilization. The purpose of this study was to investigate the antioxidant activity and phenolic content of five different plants, known for their antioxidant potential. Total phenols were determined by FolinCiocalteumethod, with few modifications. The antioxidant capacity was evaluated by DPPH, ABTS radical-scavenging activity and phosphomolybdenum method. The results showed that the highest antioxidant activity was obtained for walnut leaves in terms of ABTS evaluation and for bilberry leaves by DPPH and phosphomolybdenum methods. In the present study, peppermint, walnut and bilberry leaves proved to have an important antioxidant activity and also a total phenolic content.

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