Shown below is the UV-vis spectrum for typical sunscreen lotions ranging from SPF 15 to SPF 50. Calculate what fraction of light is transmitted through the sunscreen (SPF 15 and SPF 50) at the peak absorbance of 300 nm, where UV-B rays from the sun are located. Éxplain how SPF 50 sunscreen might better protect your skin from harmful UV rays, based on your calculations. 2.5 SPF 8 SPF 15 1.5 SPF 30 SPF 50 0.5 220 240 260 280 300 320 340 360 380 400 Wavelength (nm) Figure 1: UV-vis absorption spectra of absorbance versus wavelength from 220-400 nm for the SPF 8, 15, 30 and 50 sunscreens of the Brand S. 2. 1. Absorbance
Carbohydrates
Carbohydrates are the organic compounds that are obtained in foods and living matters in the shape of sugars, cellulose, and starch. The general formula of carbohydrates is Cn(H2O)2. The ratio of H and O present in carbohydrates is identical to water.
Starch
Starch is a polysaccharide carbohydrate that belongs to the category of polysaccharide carbohydrates.
Mutarotation
The rotation of a particular structure of the chiral compound because of the epimerization is called mutarotation. It is the repercussion of the ring chain tautomerism. In terms of glucose, this can be defined as the modification in the equilibrium of the α- and β- glucose anomers upon its dissolution in the solvent water. This process is usually seen in the chemistry of carbohydrates.
L Sugar
A chemical compound that is represented with a molecular formula C6H12O6 is called L-(-) sugar. At the carbon’s 5th position, the hydroxyl group is placed to the compound’s left and therefore the sugar is represented as L(-)-sugar. It is capable of rotating the polarized light’s plane in the direction anticlockwise. L isomers are one of the 2 isomers formed by the configurational stereochemistry of the carbohydrates.
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