再造烟叶浆料中有机酸质量分数随振荡时间的变化

Variations of organic acid contents in reconstituted tobacco pulp with oscillation time

为了考察再造烟叶浆料不同振荡时间有机酸质量分数的变化,采用离子色谱直接进样,在线固相萃取法测定了不同振荡状态、振荡时间浆料中有机酸的量。结果表明:①烟梗烟末浆料和针叶阔叶浆料分别在50℃封闭或敞口振荡9 h,浆料中各有机酸的量随时间变化规律不同,但浆料中甲酸、乙酸及有机酸总量分别在封闭振荡6 h和敞口振荡5 h时质量分数最高。②浆料封闭振荡5~7 h时微生物自然发酵产气量达最大值,与浆料中有机酸量的变化一致。③封闭和敞口振荡,烟梗烟末浆料中的甲酸及乙酸质量分数变化趋势与针叶阔叶浆料的甲酸及乙酸质量分数变化趋势分别极显著相关和显著相关;甲酸在振荡过程中变化呈无规律状态,乙酸呈缓慢升高又逐渐降低趋势。选择乙酸作为浆料的特征成分进行监控,可为生产中浆料驻留时间和工艺优化提供技术支撑。

In order to investigate the effects of oscillation time on the contents of organic acids in reconstituted tobacco pulp,the organic acid contents after different oscillation durations and oscillation states were determined by ion chromatography and online solid phase extraction via direct injection.The results showed that:1)When tobacco stem pulp and coniferous and broad-leaf pulp were oscillated at 50℃for 9 h in closed or open states,the organic acid contents in the pulp varied with the oscillation duration in a different way.The contents of formic acid,acetic acid and total organic acids peaked after 6 h in the closed state and 5 h in the open state.2)When the pulps were oscillated in the closed state for 5-7 h,the natural fermentation gas production by microorganisms reached the maximum,which was consistent with the trend of organic acid contents in the pulp.3)Closed oscillation extremely significantly correlated to and open oscillation significantly correlated to the trends of formic acid and acetic acid in the pulp respectively.During oscillation,formic acid content changed in an irregular trend,while acetic acid content increased slowly at first and then decreased gradually.Taking acetic acid as a parameter to monitor the characteristic components in pulp could be used to optimize the pulp residence time during pulp production.