Structure and vibrational spectroscopic study of alpha-tocopherol

Singh, Gurpreet; Sachdeva, Ritika; Rai, Balwant; Saini, G. S. S.

doi:10.1016/j.molstruc.2017.05.037

Cited by 13 publications

(7 citation statements)

References 26 publications

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“…In the 1500–1800 cm −1 region, the observed bands at around 1585 and 1617 cm −1 in Raman spectra are assigned to the C‐C stretching vibrations of the ring part of chromane head. [ 56,57 ] The 950–1500 cm −1 region is generally dominated by the wagging, scissoring, twisting, and rocking vibrations of CH 2 and CH 3 groups. In addition, bands assignable to the stretching vibrations of C‐O and C‐C also appear in this region.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the region below 950 cm −1 has main contribution from torsion, rocking, and bending modes and especially the bands assignable to the chromane head vibration. [ 56,57 ]…”

Section: Resultsmentioning

confidence: 99%

“…This molecule contains 11 methylene groups. [56] Raman and infrared spectra of vitamin E were collected and presented characteristic features. In the 1500-1800 cm À1 region, the observed bands at around 1585 and 1617 cm À1 in Raman spectra are assigned to the C-C stretching vibrations of the ring part of chromane…”

Section: Vitamin Ementioning

confidence: 99%

“…head. [56,57] The 950-1500 cm À1 region is generally dominated by the wagging, scissoring, twisting, and rocking vibrations of CH 2 and CH 3 groups. In addition, bands assignable to the stretching vibrations of C-O and C-C also appear in this region.…”

Section: Vitamin Ementioning

confidence: 99%

“…Finally, the region below 950 cm À1 has main contribution from torsion, rocking, and bending modes and especially the bands assignable to the chromane head vibration. [56,57] Oxidation mechanisms of vitamin E with peroxyl radicals, superoxide radical, and singlet oxygen have been extensively studied. [58,59] It is generally regarded as the most important lipid-soluble antioxidant in human tissues such as skin.…”

Section: Vitamin Ementioning

confidence: 99%

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Skin surface lipids photo‐oxidation: A vibrational spectroscopy study

Assi

Michael‐Jubeli

Jacques

et al. 2023

J Raman Spectroscopy

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Skin surface lipid (SSL) film is a mixture of sebum and epidermal lipids protecting the skin from the effects of the environment such as solar radiation. SSLs are a suitable target and scavenger for all reactive oxygen species (ROS) generated in the skin. In the SSLs, vitamin E has been identified as one of the main antioxidants that can capture ROS. This paper is the third part of a global study that evaluates the effect of solar radiation on the lipid classes that constitute SSLs. In the first two parts, the effect of solar radiation on fatty acids and triglycerides was studied using vibrational spectroscopy. In this part, the effect on the other lipid classes such as squalene (SQ), cholesterol (Chol), and wax ester (WE) (Palmitoleyl Palmitate) was studied and then the behavior of vitamin E under solar radiation was monitored. Finally, SSLs were irradiated and analyzed using vibrational spectroscopy and HT‐GC/MS to respectively follow the oxidation process and to identify the first target of solar radiation in SSLs. When irradiated alone, SQ oxidation process was detectable only after 2430 J/cm2 dose. Similar observations were obtained for vitamin E (after 1620 J/cm2). No changes were observed on the cholesterol and on the wax ester (Palmitoleyl Palmitate). In contrast, when extracted human SSLs film was irradiated, the more marked modifications were observed on SQ. This confirmed the antioxidant role of SQ by scavenging free radicals generated from the oxidation of polyunsaturated fatty acids (PUFA).

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Section: Resultsmentioning

confidence: 99%

“…Finally, the region below 950 cm −1 has main contribution from torsion, rocking, and bending modes and especially the bands assignable to the chromane head vibration. [ 56,57 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Vitamin Ementioning

confidence: 99%

Section: Vitamin Ementioning

confidence: 99%