SO₃ ²⁻ effects the 5-hydroxymethyl-2-furaldehyde content in ammonium sulphite-glucose solutions
2011
Guan, Yong-Guang | Zhu, Si-Ming | Yu, Shu-Juan | Xu, Xian-Bing | Shi, Wen-Hui
Effects of sulphite concentration on ammonium sulphite-glucose solution's pH value and browning intensity were studied. Results showed both the solution's pH value and browning intensity changed significantly in relation to the increases in SO₃ ²⁻ concentration. 5-hydroxymethyl-2-furaldehyde was measured by nuclear magnetic resonance and HPLC. This study indicates that the changes of 5-hydroxymethyl-2-furaldehyde content accompanied changes in browning intensity. Moreover, adding ammonium sulphite significantly reduced the 5-hydroxymethyl-2-furaldehyde content. The mechanism may be that SO₃ ²⁻ limits the formation of N-glucosamine, an important precursor for forming 5-hydroxymethyl-2-furaldehyde, by reacting with glucose, which could not form an imine in further reaction.
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