Antioxidant properties of conjugates of triterpenic acids with amido derivatives of Trolox

2011 ◽  
Vol 52 (2) ◽  
pp. 186-191 ◽  
Author(s):  
V. R. Khairullina ◽  
A. Ya. Gerchikov ◽  
A. B. Safarova ◽  
R. R. Khalitova ◽  
A. Yu. Spivak ◽  
...  
Keyword(s):  
Antioxidant Properties ◽  
Triterpenic Acids ◽  
Derivatives Of

scholarly journals Avocado-Derived Biomass: Chemical Composition and Antioxidant Potential

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 100
Author(s):  
Minerva C. García-Vargas ◽  
María del Mar Contreras ◽  
Irene Gómez-Cruz ◽  
Juan Miguel Romero-García ◽  
Eulogio Castro
Keyword(s):  
Chemical Composition ◽  
Phenolic Content ◽  
Antioxidant Properties ◽  
Total Phenolic ◽  
Nutritional Properties ◽  
Aqueous Fraction ◽  
Extraction Solvent ◽  
Main Components ◽  
A Minor ◽  
Derivatives Of

Avocado has become fashionable due to its great organoleptic and nutritional properties. It is consumed as a fresh product and it is also processed to obtain salad oil and guacamole. In all cases, the only usable portion is the pulp. Therefore, to be a more sustainable and profitable agribusiness, it is important to recognize which compounds from the peel and the stone waste can be converted into valuable bio-products. Therefore, their chemical composition was determined according to the National Renewable Energy Laboratory, the total phenolic content by the Folin-Ciocalteu method and the antioxidant properties by the FRAP and TEAC assays. The main components of the peel and stone were acid-insoluble lignin (35.0% and 15.3%, respectively), polymeric sugars (23.6% and 43.9%, respectively), and the aqueous extractives (15.5% and 16.9%, respectively). Both biomasses contain lipids and protein, but a minor proportion (<6%). The valorization of lignin and sugars is of interest given the high content; stones are a rich source of glucose (93.2% of the polymeric fraction), which could be used to obtain biofuels or derivatives of interest. The extractive fraction of the peel contained the highest number of phenolic compounds (4.7 g/100 g biomass), mainly concentrated in the aqueous fraction (i.e., 87%) compared to the ethanol one, which was subsequently extracted. It correlated with major antioxidant activity and, therefore, the peel can be applied to obtain antioxidants and water can be used as an environmentally friendly extraction solvent.

scholarly journals Suppression of Methane Generation during Methanogenesis by Chemically Modified Humic Compounds

Antioxidants ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1140
Author(s):  
Elena Efremenko ◽  
Olga Senko ◽  
Nikolay Stepanov ◽  
Nikita Mareev ◽  
Alexander Volikov ◽  
...  
Keyword(s):  
Antioxidant Properties ◽  
Nutrient Media ◽  
Potassium Humate ◽  
Methane Generation ◽  
Chemically Modified ◽  
Humic Compounds ◽  
Negative Effect ◽  
The Media ◽  
First Time ◽  
Derivatives Of

The introduction of various concentrations of chemically modified humic compounds (HC) with different redox characteristics into the media with free and immobilized anaerobic consortia accumulating landfill gases was studied as approach to their functioning management. For this purpose, quinone (hydroquinone, naphthoquinone or methylhydroquinone) derivatives of HC were synthesized, which made it possible to vary the redox and antioxidant properties of HC as terminal electron acceptors in methanogenic systems. The highest acceptor properties were obtained with potassium humate modified by naphthoquinone. To control possible negative effect of HC on the cells of natural methanogenic consortia, different bioluminescent analytical methods were used. The addition of HC derivatives, enriched with quinonones, to nutrient media at concentrations above 1 g/L decreased the energetic status of cells and the efficiency of the methanogenesis. For the first time, the significant decrease in accumulation of biogas was reached as effect of synthetic HC derivatives, whereas both notable change of biogas composition towards increase in the CO2 content and decrease in CH4 were revealed. Thus, modification with quinones makes it possible to obtain low-potential HC derivatives with strongly pronounced acceptor properties, promising for inhibition of biogas synthesis by methanogenic communities.

scholarly journals Identification and quantification of major derivatives of ellagic acid and antioxidant properties of thinning and ripe Spanish pomegranates

2015 ◽  
Vol 12 ◽  
pp. 354-364 ◽  
Author(s):  
Nallely Nuncio-Jáuregui ◽  
Paulina Nowicka ◽  
Sandra Munera-Picazo ◽  
Francisca Hernández ◽  
Ángel A. Carbonell-Barrachina ◽  
...  
Keyword(s):  
Ellagic Acid ◽  
Antioxidant Properties ◽  
Derivatives Of ◽  
Identification And Quantification

scholarly journals Regioselective Lipase-Catalyzed Synthesis of 3-O-Acyl Derivatives of Resveratrol and Study of Their Antioxidant Properties

2010 ◽  
Vol 58 (2) ◽  
pp. 807-813 ◽  
Author(s):  
Pamela Torres ◽  
Ana Poveda ◽  
Jesús Jimenez-Barbero ◽  
Antonio Ballesteros ◽  
Francisco J. Plou
Keyword(s):  
Antioxidant Properties ◽  
Derivatives Of ◽  
Acyl Derivatives

Antioxidant properties of 4-vinyl derivatives of hydroxycinnamic acids

2011 ◽  
Vol 128 (1) ◽  
pp. 62-69 ◽  
Author(s):  
Petra Terpinc ◽  
Tomaž Polak ◽  
Nataša Šegatin ◽  
Andrej Hanzlowsky ◽  
Nataša Poklar Ulrih ◽  
...  
Keyword(s):  
Antioxidant Properties ◽  
Hydroxycinnamic Acids ◽  
Vinyl Derivatives ◽  
Derivatives Of

An efficient synthesis and antioxidant properties of novel imino and amino derivatives of 4-hydroxy coumarins

2010 ◽  
Vol 33 (1) ◽  
pp. 5-15 ◽  
Author(s):  
Nenad Vukovic ◽  
Slobodan Sukdolak ◽  
Slavica Solujic ◽  
Neda Niciforovic
Keyword(s):  
Antioxidant Properties ◽  
Efficient Synthesis ◽  
Amino Derivatives ◽  
Derivatives Of

New Accelerators for Vulcanization of Rubber—Part III: Synthesis, Characterization, and Evaluation of Some 2-Mercaptobenzimidazole Derivatives

1985 ◽  
Vol 58 (4) ◽  
pp. 713-727 ◽  
Author(s):  
D. Pal ◽  
A. Khamrai ◽  
B. Adhikari ◽  
T. Dutta ◽  
Mrinal M. Maiti ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Antioxidant Properties ◽  
Antioxidant Compounds ◽  
Dual Function ◽  
Cure Characteristics ◽  
Aging Resistance ◽  
Rubber Part ◽  
Derivatives Of ◽  
Better Than

Abstract Five derivatives of 2-mercaptobenzimidazole containing S—N bonds have been synthesized and evaluated for their action as accelerator-antioxidant in NR gum stocks. All these compounds exhibit varying degree of accelerating efficiency; some of them, viz. MBSTP, MBSPT, and MBDSPT, offer excellent cure characteristics and vulcanizate properties comparable to some of the best commercially available curatives such as CPTD. Substitution at the N or S atom of the MB molecule does not affect adversely its antioxidant properties; rather, an improvement in aging resistance has been achieved. The degree and nature of substitution play an important role in the antioxidation properties of these MB derivatives. Thus, disubstitution offers better antioxidation characteristics than monosubstitution, and the latter, in turn, is better than unsubstituted MB. Some discussion on correlation of reactivities of these MB derivatives and their cure synergism with CPTD have been reported. It was observed that these new accelerator—antioxidant compounds show very little cure synergism with CPTD but do show promise as dual-function curatives for natural rubber.

scholarly journals Analyses of Antioxidative Properties of Selected Cyclitols and Their Mixtures with Flavanones and Glutathione

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 158
Author(s):  
Joanna Płonka ◽  
Joanna Szablińska-Piernik ◽  
Bogusław Buszewski ◽  
Irena Baranowska ◽  
Lesław B. Lahuta
Keyword(s):  
Reactive Oxygen Species ◽  
Chromatographic Method ◽  
Antioxidant Properties ◽  
Ros Generation ◽  
Oxygen Species ◽  
Dpph Radical ◽  
Antioxidative Properties ◽  
Spectrophotometric Methods ◽  
First Time ◽  
Derivatives Of

The conditions for determining the antioxidant properties of cyclitols (d-pinitol, l-quebrachitol, myo-, l-chiro-, and d-chiro-inositol), selected flavanones (hesperetin, naringenin, eriodictyol, and liquiritigenin) and glutathione by spectrophotometric methods—CUPRAC and with DPPH radical, and by a chromatographic method DPPH-UHPLC-UV, have been identified. Interactions of the tested compounds and their impact on the ox-red properties were investigated. The RSA (%) of the compounds tested was determined. Very low antioxidative properties of cyclitols, compared with flavanones and glutathione alone, were revealed. However, a significant increase in the determined antioxidative properties of glutathione by methyl-ether derivatives of cyclitols (d-pinitol and l-quebrachitol) was demonstrated for the first time. Thus, cyclitols seem to be a good candidate for creating drugs for the treatment of many diseases associated with reactive oxygen species (ROS) generation.

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