UV-Vis Spectrophotomertic Investigation of β-Carotene and Morin in Presence of AOT/Ethanol System

2016 ◽  
Vol 32 (1-2) ◽  
pp. 16
Author(s):  
Ajaya Bhattarai ◽  
Wilczura–Wachnik Hanna
Keyword(s):  
Linear Regression ◽  
Surfactant Concentration ◽  
Binding Constants ◽  
Reversed Micelles ◽  
Palisade Layer ◽  
Regression Procedure ◽  
Distribution Constants ◽  
Ethanol System ◽  
Β Carotene ◽  
Aot Reversed Micelles

The precise measurements of β-carotene and morin absorbance in the presence of surfactant/ethanol at 25°C by UV-vis technique are reported. The surfactant used in the study was sodium bis(2-ethylhexyl) sulfosuccinate (Aerosol-OT or AOT) and the solvent was ethanol. For the system AOT/ethanol/β-carotene, surfactant concentration varied from 0.002 to 0.23 [mol/kg]; whereas in case of AOT/ethanol/morin system, it was between 0.001 and 0.25[mol/kg]. In all cases during UV- vis measurements β-carotene concentration was 0.0018[mol/kg] and morin concentration was 0.0094[mol/kg]. In UV-vis experiment, β-carotene or morin absorbance was measured as a function of surfactant concentration. Assuming the solute distribution between solvent and the AOT reversed micelles according to Nernstian law, the results were analysed with the help of a Non Linear Regression Procedure, in which a β-carotene and morin binding constants and distribution constants were obtained. Computed data indicate that in case of β-carotene the location of the molecules might not only in palisade layer of AOT reversed micelles but also in the interior whereas in case of morin, the only possible location seems to be the AOT palisade layer.

scholarly journals Vitamin A and E Homologues Impacting the Fate of Acrylamide in Equimolar Asparagine-Glucose Model System

Antioxidants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 993
Author(s):  
Su Lee Kuek ◽  
Azmil Haizam Ahmad Tarmizi ◽  
Raznim Arni Abd Razak ◽  
Selamat Jinap ◽  
Maimunah Sanny
Keyword(s):  
Vitamin E ◽  
Linear Regression ◽  
Vitamin A ◽  
Regression Model ◽  
Linear Regression Model ◽  
Model System ◽  
Concentration Increase ◽  
Acrylamide Formation ◽  
Β Carotene

This study aims to evaluate the influence of Vitamin A and E homologues toward acrylamide in equimolar asparagine-glucose model system. Vitamin A homologue as β-carotene (BC) and five Vitamin E homologues, i.e., α-tocopherol (AT), δ-tocopherol (DT), α-tocotrienol (ATT), γ-tocotrienol (GTT), and δ-tocotrienol (DTT), were tested at different concentrations (1 and 10 µmol) and subjected to heating at 160 °C for 20 min before acrylamide quantification. At lower concentrations (1 µmol; 431, 403, 411 ppm, respectively), AT, DT, and GTT significantly increase acrylamide. Except for DT, enhancing concentration to 10 µmol (5370, 4310, 4250, 3970, and 4110 ppm, respectively) caused significant acrylamide formation. From linear regression model, acrylamide concentration demonstrated significant depreciation over concentration increase in AT (Beta = −83.0, R2 = 0.652, p ≤ 0.05) and DT (Beta = −71.6, R2 = 0.930, p ≤ 0.05). This study indicates that different Vitamin A and E homologue concentrations could determine their functionality either as antioxidants or pro-oxidants.

AOT Reversed Micelles Investigated by Fluorescence Anisotropy of Cresyl Violet

1994 ◽  
Vol 116 (23) ◽  
pp. 10601-10611 ◽  
Author(s):  
Nadine Wittouck ◽  
R. Martin Negri ◽  
Marcel Ameloot ◽  
Frans C. De Schryver
Keyword(s):  
Fluorescence Anisotropy ◽  
Reversed Micelles ◽  
Cresyl Violet ◽  
Aot Reversed Micelles

Application of factorial design to the study of transesterification reactions using cutinase in AOT-reversed micelles

1997 ◽  
Vol 21 (2) ◽  
pp. 117-123 ◽  
Author(s):  
C.M.L. Carvalho ◽  
M.L.M. Serralheiro ◽  
J.M.S. Cabral ◽  
M.R. Aires-Barros
Keyword(s):  
Factorial Design ◽  
Reversed Micelles ◽  
Aot Reversed Micelles

scholarly journals Influence of Oxygen-Containing Sulfur Flavor Molecules on the Stability of β-Carotene under UVA Irradiation

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 318 ◽  
Author(s):  
Gong-Liang Zhang ◽  
Hong-Yan Wu ◽  
Ying Liang ◽  
Jie Song ◽  
Wei-Qi Gan ◽  
...  
Keyword(s):  
Sulfur Atom ◽  
Critical Role ◽  
Oxidation Products ◽  
First Order ◽  
Uva Irradiation ◽  
First Order Kinetics ◽  
Dynamic Degradation ◽  
The Stability ◽  
Ethanol System ◽  
Β Carotene

The influence of 11 kinds of oxygen-containing sulfur flavor molecules was examined on β-carotene stability under UVA irradiation in ethanol system. Both the effects of sulfides on dynamic degradation of β-carotene and the relation between structure and effect were investigated. The oxidation products of β-carotene accelerated by sulfides under UVA irradiation were also identified. The results indicated that the disulfides had more obvious accelerative effects on the photodegradation of β-carotene than mono sulfides. The degradation of β-carotene after methyl (2-methyl-3-furyl) disulfide (MMFDS), methyl furfuryl disulfide (MFDS) and bis(2-methyl-3-furyl) disulfide (BMFDS) exposure followed first-order kinetics. Furan-containing sulfides such as MMFDS and BMFDS showed more pronounced accelerative effects than their corresponding isomers. The oxidation products were identified as 13-cis-β-carotene, 9,13-di-cis-β-carotene and all-trans-5,6-epoxy-β-carotene. These results suggest that both the sulfur atom numbers and the furan group in oxygen-containing sulfides play a critical role in the photooxidation of β-carotene.

Formation of AOT Reversed Micelles and W/O Microemulsions

1992 ◽  
Vol 65 (10) ◽  
pp. 2715-2719 ◽  
Author(s):  
Takeshi Kawai ◽  
Kaoru Hamada ◽  
Naoaki Shindo ◽  
Kijiro Kon-no
Keyword(s):  
Reversed Micelles ◽  
Aot Reversed Micelles
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