UV-protector

One excellent UV protector for foods is PABA, a B vitamin. Likewise, many of the same antioxidants we ingest as health supplements—such as vitamin C and a similar chemical, erythorbic acid vitamin E and lecithin, a source of the important nutrients choline and inositol—occur naturally in food. 

Maynard Smith, J. and Szathmary, E. (1998). The Origins of Life. Oxford University Press, Oxford. Morowitz, H. (2002). The Emergence of Everything. Oxford University Press Inc., New York. Mulkidjanian, A.Y., and Junge, W. (1999). Primordial UV-protectors as ancestors of the photosynthetic pigment protein. In G. A. Peshek, et al. (eds). The Phototropic Prokaryotes. Kluwer Academic Press Pub., New York, pp. 805-812... 

MuUddjanian A. and Junge W. (1997) On the origin of photosynthesis as inferred from sequence analysis—a primordial UV-protector as common ancestor of reaction centers and antenna proteins. Photosyn. Res. 51, 27-42. 

In addition to the local contamination numerous substances were detected within the nonextractable fraction, that are common riverine contaminants including e.g. phosphates, nitro compounds, UV-protectors, pesticides, fragrances, organotin compounds and halogenated aromatics (see Table 2). 

R, resistant RS, resistant only if stabilized with UV protector X, not resistant. Water absorption rate 24 h at 73°F/23°C (%). 

In this study, the possibilities of using polymers containing silicon nanopaiticles as effective UV protectors are considered. First, the stmcture of nc-Si obtained under different conditions and its aggregates, their adsorption and optical properties was studied in order to find ways of control the UV spectral characteristics of mirlti-phase polymer composites containing nanocrystalline silicon. Also, the pirrpose of this work was to investigate the effect of the concerrtration of siUcon nanoparticles embedded in polymer matrix and the methods of preparation of these nanoparticles on the spectral characteristics of such nanocomposites. On the basis of the data obtained, recommendations for designing UV protectors based on these nanocomposites were formrrlated. 

RS = resistant only if stabilized with a UV protector. X = not resistant. 

Craciun, E., loncea. A., Jitaru, I., Covaliu, C., Zaharescu, T. Nano oxides UV protectors for transparent organic coatings. Rev. Chim. 62, 21-26 (2010)... 

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