Kuan Yau-Hoong - Effects of Ultraviolet Irradiation on the Physicochemical and Functional Properties of Gum Arabic

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  The impact of ultraviolet (UV) irradiation on the physicochemical   and functional properties of gum arabic was investigated. Gum   arabic samples were exposed to UV irradiation for 30, 60, 90, and   120 min; gum arabic was also treated with formaldehyde for   comparison. Molecular weight analysis using gel permeation   chromatography indicated that no significant changes occurred on   the molecular structure on the samples exposed to UV irradiation.   Free amino group analysis indicated that mild UV irradiation (30   min) could induce cross-linking on gum arabic; this result was   comparable with that of samples treated with formaldehyde.   However, viscosity break down was observed for samples exposed to   UV irradiation for longer times (90 and 120 min). All irradiated   and formaldehyde-treated samples exhibited better emulsification   properties than unirradiated samples. These results indicate that   UV-irradiated gum arabic could be a better emulsifier than the   native (unmodified) gum arabic and could be exploited   commercially.

  Address (URL): http://pubs.acs.org/doi/pdfplus/10.1021/jf9015625