Effects of UV-C irradiation and traditional thermal processing on acemannan contained in Aloe vera gel blends

•UV-C irradiation was identified as an alternative way of Aloe vera gel processing.•Thermal treatment (TT) affected simple sugar content more than UV-C irradiation.•In contrast to TT, UV-C irradiation did not strongly affect molecular weight.•TT resulted in more pronounced deacetylation of acemannan...

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Veröffentlicht in:Carbohydrate polymers 2019-10, Vol.222, p.114998-114998, Article 114998
Hauptverfasser: Rodríguez-Rodríguez, Maylem Z., Meléndez-Pizarro, Carmen O., Espinoza-Hicks, José C., Quintero-Ramos, Armando, Sánchez-Madrigal, Miguel Á., Meza-Velázquez, Jorge A., Jiménez-Castro, Jorge A.
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Sprache:eng
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Zusammenfassung:•UV-C irradiation was identified as an alternative way of Aloe vera gel processing.•Thermal treatment (TT) affected simple sugar content more than UV-C irradiation.•In contrast to TT, UV-C irradiation did not strongly affect molecular weight.•TT resulted in more pronounced deacetylation of acemannan than UV-C irradiation.•Acemannan quantification was performed by 1H NMR. 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.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2019.114998