Abstract
Opuntia is a cactaceae widely known because of its nutritional properties. However, this distinguished plant has other benefits that may be used in non-conventional applications. The aim of this work is to investigate the optical properties of a mucilage to obtain a deeper and more detailed knowledge about possible non-alimentary applications of this organic material. In this work, we investigate some optical properties such as the absorbance and reflectance of a powdered mucilage in wavelengths ranging from 200 to 1300 nm. In addition, samples of commercial sunscreens were analyzed in the same band to compare their optical properties with those of the mucilage. We also discuss the feasibility of employing this mucilage as a unique active ingredient in organic sunscreens because of its optical characteristics. Finally, we comment on the limited usefulness of the sun protection factor as a measure of sunscreen's efficacy.
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