Effects of UV-C irradiation and traditional thermal processing on acemannan contained in Aloe vera gel blends.
The effects of pH (3.5, 4.5, and 5.5) and UV-C irradiation dose (12.8, 24.2, 35.8, and 54.6 mJ/cm2) on the physicochemical properties changes in 10% Aloe vera gel blends; in addition, the acemannan concentration and structural changes in the precipitated polysaccharides were evaluated. A thermal treatment (TT; 45 s at 90 °C) was used for comparison. In contrast to TT, a dose of 24.2 mJ/cm2 did not induce significant changes of free sugar content. Moreover, TT and UV-C irradiation did not significantly affect the content of mannose but increased those of galactose, fructose, and glucose. 1H NMR analysis revealed minimal changes in the isolated fractions of acemannan, indicating that compared to the unprocessed control sample, the acemannan deacetylation was more pronounced by TT (27%) than by UV-C irradiation (11% at 54.6 mJ/cm2), without any significant difference between the two. UV-C irradiation of Aloe vera gel blends at pH 3.5 and 24.2 mJ/cm2 was an alternative to TT and efficiently preserve the characteristics of acemannan.
['Rodríguez-Rodríguez|Maylem Z|MZ|', 'Meléndez-Pizarro|Carmen O|CO|', 'Espinoza-Hicks|José C|JC|', 'Quintero-Ramos|Armando|A|', 'Sánchez-Madrigal|Miguel Á|MÁ|', 'Meza-Velázquez|Jorge A|JA|', 'Jiménez-Castro|Jorge A|JA|']
D000504:Aloe D005782:Gels D006361:Heating D006601:Hexoses D006863:Hydrogen-Ion Concentration D008351:Mannans D008970:Molecular Weight D028321:Plant Preparations D013395:Sucrose D014466:Ultraviolet Rays
UV-C Acemannan Aloe vera Deacetylation (1)H NMR Molecular weight