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Is It Possible To Increase the Aloin Content of Aloe vera by the Use of Ultraviolet Light?

Martínez-Romero Domingo, Guillén Fabián, Pérez-Aguilar Henoc, Castillo Salvador, Serrano María, Zapata Pedro J., Valero Daniel
Journal of agricultural and food chemistry 2013 v.61 no.9 pp. 2165-2170
Aloe vera, Botrytis cinerea, Penicillium digitatum, chlorophyll, gels, latex, leaves, ultraviolet radiation
In this paper, the effects of ultraviolet (UV) treatments on the aloin content of Aloe vera L. gel have been analyzed. UV-A treatment to A. vera plants for 36 days led to an increase in the aloin concentration in gel, rind tissue, and latex, while a decrease in chlorophylls a and b occurred in the photosynthetic tissue as a consequence of UV treatment. The growth of Penicillium digitatum and Botrytis cinerea (artificially inoculated on the leaf surface) was drastically decreased in UV-A-treated leaves, which could be attributed to the increase in the aloin concentration by the UV-A treatment. In addition, UV-C treatment to detached leaves also led to an increase in the gel aloin concentration, at higher levels than occurred with UV-A treatment, although leaves showed severe lesions after 48 h of treatment.