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Mar Drugs
2019 Jan 14;171:. doi: 10.3390/md17010055.
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UVA and UVB Photoprotective Capabilities of Topical Formulations Containing Mycosporine-like Amino Acids (MAAs) through Different Biological Effective Protection Factors (BEPFs).
de la Coba F
,
Aguilera J
,
Korbee N
,
de Gálvez MV
,
Herrera-Ceballos E
,
Álvarez-Gómez F
,
Figueroa FL
.
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The safety and stability of synthetic UV-filters and the procedures for evaluating the photoprotective capability of commercial sunscreens are under continuous review. The influence of pH and temperature stressors on the stability of certain Mycosporine-like amino acids (MAAs) isolated at high purity levels was examined. MAAs were highly stable at room temperature during 24 h at pH 4.5⁻8.5. At 50 °C, MAAs showed instability at pH 10.5 while at 85 °C, progressive disappearances were observed for MAAs through the studied pH range. In alkaline conditions, their degradation was much faster. Mycosporine-serinol and porphyra-334 (+shinorine) were the most stable MAAs under the conditions tested. They were included in four cosmetically stable topical sunscreens, of which the Sun Protection Factor (SPF) and other Biological Effective Protection Factors (BEPFs) were calculated. The formulation containing these MAAs showed similar SPF and UVB-BEPFs values as those of the reference sunscreen, composed of synthetic UV absorbing filters in similar percentages, while UVA-BEPFs values were slightly lower. Current in vitro data strongly suggest that MAAs, as natural and safe UV-absorbing and antioxidant compounds, have high potential for protection against the diverse harmful effects of solar UV radiation. In addition, novel complementary in vitro tests for evaluation of commercial sunscreens efficacy are proposed.
Figure 1. HPLC chromatograms of MAAs extracts after the Dowex chromatography purification process measured at the maximum absorption wavelength of the main MAA in each extract. The mobile phase was 1.5% aqueous methanol (v/v) plus 0.15% acetic acid (v/v) in water run isocratically at 0.5 mL min−1. Analyses were performed at 20 °C using a C8 chromatographic column.
Figure 2. Absorption spectra of MAAs extracts after 24 h of incubation in 50 mM phosphate buffer pH 4 (), 7.5 (), 8.5 () or 10.5 () at room temperature (25 °C). Initial absorbance (). (A) P-334 (+SH), (B) M-Ser (OH), (C) AS-330 (+PNE) and (D) SH.
Figure 3. Absorption spectra of MAAs extracts after 1.5 (), 3 (), 4.5 () and 6 () hours of incubation in 50 mM phosphate buffer at pH 10.5 and 50 °C. Initial absorbance (). (A) P-334 (+SH), (B) M-Ser (OH), (C) AS-330 (+PNE) and (D) SH.
Figure 4. UV relative absorption spectra of different sunscreens studied: P-334 (+SH) plus M-Ser (OH) () reference (OMC Y BMDM) (), P-334 (+SH) () and M-Ser (OH) ().
Figure 5. Normalized Action Spectra (290–400 nm) for different UVB and UVA mediated harmful biological effects used in this study: DNA Damage (), erythema (), photocarcinogenesis (NMSC) (), induction of systemic suppression of CHS (), photoisomerization of urocanic acid (), formation of singlet oxygen () and photoaging ().
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