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Showing 1 to 20 of 486 for “"antioxidants"”.
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Evaluation of natural antioxidants
… partition coefficients (log P) of 53 phenolic antioxidants were measured by reversed-phase HPLC and calculated by log P prediction software. There was a very strong linear correlation between measured and calculated values (r=0.91). The importance of log P in determining antioxidant assay …
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Bound antioxidants in elastomers
Amine and phenolic antioxidants are found to react with chloroprene (CR) and epichlorohydrin (ECH) rubbers with their reactive chlorine atoms. These reactions take place during high shear mixing in a torque rheometer or in a Winkworth mixer at high temperature or during the vulcanization of the …
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Biocatalytic studies of phenol oxidases producing antioxidants
In recent years there has been increasing interest in the production of oligomers and polymers of economic importance using biocatalysts; the application of enzymes in dimerisation or polymerisation processes can lead to the synthesis of unique compounds, with novel properties, that could not be …
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Synthesis and Evaluation of Bound Thiol Antioxidants
The reactions of hindered phenolic antioxidants with NR latex in the presence of a free radical generating system have been studied. 3,5-Di-tert-butyl-4-hydroxybenzyl carboxy methyl (BTGA), and ethyl (BTPA) sulphides and 3,5-di-tert-butyl-4-hydroxybenzyl mercaptoglycollate (BTGE) have been found to …
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Graft polymerisation of antioxidants into natural rubber
Antioxidants containing polymerisable vinyl groups have been successfully bound to natural rubber in the presence of suitable free radical generators. Reaction parameters such as the mode of initiation, initiator system, reaction time, pH of the reaction medium, swelling time have been investigated …
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High Molecular Weight and Polymer-Bound Antioxidants
… and in polypropylene, of a series of sulphur antioxidants of increasing molecular weight and containing the phenolic moiety have furnished evidence for the importance of both the intrinsic antioxidant activity of the additives as well as those of their physical attributes. The latter include: …
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Mechanisms of Action of Sulphur Containing Antioxidants
… chemistry of two classes of sulphur-containing antioxidants. Part A is concerned with the sulphoxide dimethylsulphinyldipropionate (DMSD) and its reaction with hydroperoxide. Its activity as a peroxide decomposer is explained in terms of catalytic activity of certain of its reaction products. In …
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Antioxidants Facilitate Recovery From Lipopolysaccharide Induced Sickness
Collectively, these data suggest that alpha-T and selenium do not prevent SB but promote recovery from LPS-induced sickness in adult and aged mice. This is particularly important given that the elderly population often experience marginal nutrient deficiencies, are immunocompromised and highly …
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Honey as a Source of Natural Antioxidants
Dietary antioxidants might prevent oxidative damage to tissues and therefore protect against chronic diseases. Previous research demonstrated that honeys from various floral sources exhibit significant antioxidant activity, rendering honey effective as a food antioxidant. The objective of the …
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Green tea antioxidants inhibition of oxidation and mutation
… complex mixture containing several major potent antioxidants e.g., flavins and/or polyphenols. These antioxidants in green tea may react directly or indirectly with strong oxidizers e.g. peroxynitrite or its constituents (superoxide or nitric oxide). Green tea antioxidants can destroy the …
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Production of antimicrobials and antioxidants from filamentous fungi
… selected species were demonstrated as effective antioxidants. Additionally, total phenolic content positively attributed to the overall antioxidant capacity of the extracts. Bioassay-guided isolation and purification of extracts from cultured mycelia led to the identification of biologically …
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A Study of Phosphorus-Containing Antioxidants in Polyolefins
… sulphide, TPS, were examined as potential antioxidants in polypropylene. All the dithiophosphonates were very good melt stabilisers when compared to commercial controls. Their effectiveness as thermal antioxidants varied considerably from CuDiBuPn which was poor to NiDiBuPn which was …
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Identifying iron-binding antioxidants in New Zealand honeydew honey
… their molecular structure. The stability of the antioxidants on exposure to heat and high and low pH was investigated to get a better understanding of the conditions which could be used when developing suitable techniques for the isolation of the iron-binding antioxidants. The isolation of the …
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Evaluation and Mechanism of Sulphur-Bound Antioxidants in Rubbers
A quantitative study of the extent of the reaction between the hindered phenolic antioxidant 3,5-di-tertbutyl-4-hydroxyphenyl methane thiol (BHBM) and natural rubber latex, showed that this was low, due to naturally occurring non-rubber constituents. In SBR latex, much higher levels of binding were …
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Studies on the Function of Vitamin E and Antioxidants
Made available in DSpace on 2014-12-05T17:47:47Z (GMT). No. of bitstreams: 1 6200579.pdf: 4116911 bytes, checksum: 7e0d9f64c9120772e648c0a074a74da1 (MD5) Previous issue date: 1961
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Influence of lipid antioxidants on soybean seed storage life
… to be a primary event in seed aging. Lipid antioxidants might have the potential to protect dry seed by neutralizing free radicals, which propagate lipid peroxidation and other destructive events. Seed were treated with antioxidants in dimethyl sulfoxide (DMSO) to investigate possible …
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