Abstract
Levan, as a biocompatible and renewable biopolymer with anticancer properties, is a promising candidate for a wide range of applications in various fields of industry. However, in the literature, there is a lack of information about its behavior under the influence of UV irradiation, which may limit its potential application, including medical science. Therefore, this study describes the effects of irradiation on the structural properties of levan. This type of fructan was subjected to stability tests under radiation conditions using LED and polychromatic lamps. The results showed that the photodegradation of levan irradiated with a polychromatic light occurs faster and more efficiently than the photodegradation of levan irradiated with an LED lamp. Furthermore, AFM analysis showed that the surface became smoother after irradiation, as evidenced by decreasing values of roughness parameters. Moreover, UV irradiation causes the decrease of total surface free energy and both its components in levan; however, more significant changes occur during irradiation of the sample with a polychromatic lamp.
Highlights
Levan is a polysaccharide produced from a few plant species and several microorganisms, such as bacteria, fungi, and yeast
One can conclude that the photodegradation of levan irradiated with an iridescent light occurs faster and more efficiently than the photodegradation of levan irradiated with an light-emitting diode (LED) lamp
UV irradiation causes a decrease of total surface free energy and both its components in levan; 0 13 44 more significant changes occur during irradiation of the sample with a polychromatic lamp
Summary
Levan is a polysaccharide produced from a few plant species and several microorganisms, such as bacteria, fungi, and yeast. It is an exopolysaccharide whose main chain consists of D-fructofuranosyl groups connected by β-(2,6) bonds, while the branches of the main chain are generated by β-(1,2) bonds (Figure 1) [1,2]. Many studies in the literature focus on its anticancer, antioxidant, hypocholesterolemic, and antidiabetic activities [10,11]. It is used in many different products, including biodegradable plastics, textile coatings, adhesives, and detergents. The wide application of levan in numerous industry sectors has contributed to reducing its production costs
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