Influence of β-Carotene and Lycopene on Oxidation of Ethyl Linoleate in One- and Disperse-Phased Model Systems

2020 ◽  
Vol 68 (9) ◽  
pp. 2747-2756 ◽  
Author(s):  
Thomas Heymann ◽  
Lea M. Schmitz ◽  
Josefine Lange ◽  
Marcus A. Glomb
Keyword(s):  
Ethyl Linoleate ◽  
Model Systems ◽  
Β Carotene

scholarly journals Influence of microwave assisted extraction on antioxidant and antiplasmodial activities of Trichilia roka extracts

2015 ◽  
Vol 4 (5) ◽  
pp. 248-252
Author(s):  
Olga Nana ◽  
◽  
Jean Momeni ◽  
Fabrice Fekam Boyom ◽  
Martin Benoît Ngassoum ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Properties ◽  
Model Systems ◽  
Antiplasmodial Activity ◽  
Root Bark ◽  
Microwave Assisted Extraction ◽  
Mechanical Agitation ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Β Carotene

Antiplasmodial and antioxidant activities of extracts derived from Trichilia roka (Chiov) (Meliaceae) root bark were determined respectively in vitro and using two methods as well as 1,1-diphenyl-2-picrylhydrazyl radicalscavenging and β-carotene-linoleate model systems. The microwave assisted extraction extract was more effective concern antioxydant activity than the antiplasmodial activity compare to conventional mechanical agitation extraction method. Extracts obtained by microwave assisted extraction showed a high total polyphenol content of 126766 μg Equivalent of Gallic acid /g Dry Mater and a total flavonoid content of 789.22 μg Equivalent of Quercetin/g dry mater but a low antiplasmodial activity with and inhibition concentration of 48.386 μg /mL and 23.983 μg/mL for mechanical agitation extract. The evaluation of the antioxidant properties of the two extracts showed that those obtained by microwave assisted extraction shown in the 1,1-diphenyl-2-picrylhydrazyl assay and in the β-carotene bleaching test, the highest antioxidant activity respectively, with an antioxidant activity of 82.12% and with a radical-scavenging activity with inhibition percentage of 88.78%..

Antioxidant and prooxidant activities of β-carotene in accelerated autoxidation and photosensitized model systems

2012 ◽  
Vol 21 (2) ◽  
pp. 607-611 ◽  
Author(s):  
Dong-Oh Ha ◽  
Chan Uk Park ◽  
Mi-Ja Kim ◽  
JaeHwan Lee
Keyword(s):  
Model Systems ◽  
Β Carotene

Peroxidase-catalyzed oxidation of β-carotene in HL-60 cells and in model systems: Involvement of phenoxyl radicals

Lipids ◽  
1997 ◽  
Vol 32 (2) ◽  
pp. 131-142 ◽  
Author(s):  
Vladimir A. Tyurin ◽  
Gianfranca Carta ◽  
Yulia Y. Tyurina ◽  
Sebastiano Banni ◽  
Billy W. Day ◽  
...  
Keyword(s):  
Model Systems ◽  
Phenoxyl Radicals ◽  
Catalyzed Oxidation ◽  
Β Carotene

scholarly journals Polyphenolic and molecular variation in Thymus species using HPLC and SRAP analyses

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Danial Sarfaraz ◽  
Mehdi Rahimmalek ◽  
Ghodratollah Saeidi
Keyword(s):  
Hplc Analysis ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Model Systems ◽  
Total Phenolic ◽  
Species Structure ◽  
Components Analysis ◽  
Amova Analysis ◽  
Phenolic And Flavonoid ◽  
Β Carotene

AbstractIn the present research, inter and intra genetic variability of 77 accessions belonging to 11 Thymus species were assessed using eight SRAP primer combinations. High polymorphism (98.3%) was observed in the studied species. The cluster analysis classified Thymus species into five main groups. According to molecular variance (AMOVA) analysis, 63.14% of total genetic variation was obtained within the species, while 36.86% of variation was observed among species. STRUCTURE analysis was also performed to estimate the admixture of species. For instance, T. carmanicus and T. transcaspicus revealed high admixtures. HPLC analysis also demonstrated the presence of rosmarinic acid (32.3–150.7 mg/100 g DW), salvianolic acid (8–90 mg/100 g DW), and cinnamic acid (1.7–32.3 mg/100 g DW) as major phenolic acids, as well as apigenin, epicatechin, and naringenin as the major flavonoids. The highest phenolic and flavonoid contents were detected in T. transcaspicus (37.62 mg gallic acid equivalents (GAE) g−1 DW) and T. vulgaris (8.72 mg quercetin equivalents (QE) g−1 DW), respectively. The antioxidant properties and total phenolic of Thymus species were examined using DPPH and β-carotene-linoleic acid model systems and consequently T. vulgaris and T. pubescens were detected with the highest and the lowest antioxidant activities respectively. Cluster and principal Components Analysis (PCA) of the components classified the species in to three groups. Finally, similarity within some species was observed comparing molecular and phytochemical markers. For instance, T. vulgaris separated from other species according to major polyphenolic profiles and molecular analyses, as well as T. transcaspicus, T. carmanicus, and T. fedtschenkoi that were clustered in the same groups.

Stability of β-carotene in model systems containing sulphite

2007 ◽  
Vol 12 (3) ◽  
pp. 309-316 ◽  
Author(s):  
A. K. BALOCH ◽  
K. A. BUCKLE ◽  
R. A. EDWARDS
Keyword(s):  
Model Systems ◽  
Β Carotene

scholarly journals STUDIES OF THE BIOLOGICAL AND THERAPEUTIC EFFECTS OF ARGENTINE STINGLESS BEE PROPOLIS

2018 ◽  
Vol 8 (5) ◽  
pp. 382-392 ◽  
Author(s):  
Yanina Brodkiewicz ◽  
Karenina Marcinkevicius ◽  
Marcos Reynoso ◽  
Virginia Salomon ◽  
Luis Maldonado ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Radical Scavenging ◽  
Biological Properties ◽  
Model Systems ◽  
Therapeutic Effects ◽  
Immersion Method ◽  
Isolation And Identification ◽  
Bioactive Substances ◽  
Biofilm Inhibition ◽  
Β Carotene

Meliponids are native bees of the Americas, characterized by having no sting (ANSA). Some live in the Yunga forests of northern Argentina, a place rich in a diversity of this type of bees of which at least thirty-three species may be found. Propolis is a resinous substance that bees collect from plants exudates. Chemical composition and functional properties vary according to the flora of the place where the hives are. They have been valued by humans for their biological properties for centuries. This study is aimed at investigating the antinociceptive, antioxidant and anti-biofilm activities of propolis from the stingless bees Tetragonisca fiebrigi Schwarz and Scaptotrigona jujuyensis Schrottky found in Estación Experimental Agropecuaria Famaillá of INTA, Tucumán, Argentina. Analgesic activity of the extracts was estimated against acetic acid induced writhing, tail immersion method and formalin test. Antioxidant capacity was evaluated using DPPH free radical scavenging and β-carotene bleaching assays. Propolis anti biofilm activity was tested on Pseudomonas aeruginosa ATCC 27853 and Staphylococcus aureus ATTC 6538P bacteria. Phytochemical constituents were obtained using standard chemical methods. The propolis alcoholic extracts of the studied species possess antinociceptive activity at both central and peripheral levels as demonstrated by the three algesia tests used. Both propolis extracts were effective antioxidants in DPPH and β-carotene linoleic acid model systems. S. jujuyensis propolis tested at all doses against S. aureus and P. aeruginosa presented a selective biofilm inhibition unrelated to bacterial growth inhibition, thus achieving a reduction in pathogenicity. The chemical studies revealed the presence of sterols, triterpenes, catechins, coumarins, flavonoids, phenols, tannins and anthocyanidins. Chemical composition observed in the T.fiebrigi and S. jujuyensis propolis, suggest that those responsible for the activity would be chemical compounds of a non-phenolic nature. Our data indicate that geopropolis is a natural source of bioactive substances with promising beneficial properties for human health. Isolation and identification of compounds responsible for the pharmacological activities displayed by propolis has started.  

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