Isomerization and Epimerization of Galactose to Tagatose and Talose in a Phosphate Buffer Containing Organic Solvents under Subcritical Water Conditions

Isomerization and Epimerization of Galactose to Tagatose and Talose in a Phosphate Buffer Containing Organic Solvents under Subcritical Water Conditions
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亚临界水条件下含有机溶剂的磷酸盐缓冲液中半乳糖异构化和差向异构化为塔格糖和塔罗糖

DOI:
10.1021/acs.iecr.1c00682
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发表时间:
2021
影响因子:
4.2
通讯作者:
Kobayashi Takashi
Kobayashi Takashi
中科院分区:
工程技术3区
文献类型:
--
作者:
Onishi Yuichiro;Furushiro Yuya;Adachi Shuji;Kobayashi Takashi

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在本研究中,半乳糖在亚临界水条件下在140 °C和5 MPa下在10 mmol/L磷酸钠缓冲液(pH 7.0)和乙醇的混合物中使用管式反应器处理。研究了乙醇浓度(0- 60wt%)对半乳糖异构化和差向异构化分别生成塔格糖和塔罗糖的影响。乙醇和缓冲剂两者协同改善异构化行为。将乙醇浓度增加到60重量%,在300秒时塔格糖产率从13%提高到16%。相比之下,当向磷酸盐缓冲液中加入乙醇时,在300 s时塔罗糖的产率从1.5%略微降低至1.2%。在每种处理条件下,在25 °C下处理溶液的pH随着处理时间的增加而降低。然而,通过添加乙醇适度抑制pH的降低,这可能是塔格糖产率提高的原因之一。添加其他有机溶剂,如烷醇、多元醇、乙腈和吡啶,也提高了塔格糖的产率。
In this study, galactose was treated under subcritical water conditions at 140 °C and 5 MPa in a mixture of 10 mmol/L sodium phosphate buffer (pH 7.0) and ethanol using a tubular reactor. The effects of ethanol concentration (0–60 wt %) on the isomerization and epimerization of galactose, respectively, to tagatose and talose were investigated. Both ethanol and buffer synergistically improved the isomerization behavior. Increasing the ethanol concentration up to 60 wt % improved the tagatose yield from 13 to 16% at 300 s. In contrast, the yield of talose slightly decreased from 1.5 to 1.2% at 300 s when ethanol was added to the phosphate buffer. The pH of treated solution at 25 °C decreased with an increase in the duration of treatment under each treatment condition. However, the decrease in pH was moderately suppressed by the addition of ethanol, which could be one of the reasons for the improvement in tagatose yield. The addition of other organic solvents, such as alkanols, polyols, acetonitrile, and pyridine, also improved the tagatose yield.
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