共查询到18条相似文献,搜索用时 109 毫秒
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将国内外5种(国外1种,国内4种)低焦油烤烟型卷烟烟丝经同时蒸馏萃取、GC、GC/MS分析测试,对低焦油烤烟型卷烟烟丝29种中性香味成分进行了分析研究。国内外卷烟烟丝的常规化学成分也进行了测试比较。结果发现,国产烤烟型卷烟挥发性、半挥发性中性成分总量、酮类成分总量、醇类成分总量比国外烤烟型卷烟低,醛类成分总量、酯类成分总量比国外高。4种国产烤烟型卷烟烟丝重要中性香味成分中均比国外烤烟型卷烟低10%以上的有:苯乙醛、糠醇、苯甲醇、六氢金合欢基丙酮和2-甲氧基4-乙烯基苯酚;均高于10%的有:糠醛、亚麻酸甲酯等。 相似文献
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《云南化工》2017,(4):61-65
为了建立一种能够快速、准确地测定卷烟加料工序中标记物1,2丙二醇含量的方法,在1,2-丙二醇含量0.1~3.0%范围内,以0.1%为梯度间隔,通过重复性制样的方法制备了120个样品,以气相色谱法检测结果为参比值,采用偏最小二乘法建立了加料后烟叶中1,2-丙二醇含量的近红外预测模型。利用生产线上随机抽取的10个加料后的烟叶样品对模型进行了外部验证,结果表明,1,2-丙二醇含量的近红外预测值与气相色谱法测定结果间差异不显著,绝对误差和相对误差的平均值分别为0.039%和4.61%;利用随机选择的3个样品进行重复性试验,结果表明相对标准偏差分别为1.38%、1.50%和1.02%。综上所述,所建立的近红外预测模型的准确度较高、重复性较好,能够准确、快速地测定加料后烟叶中1,2-丙二醇含量。 相似文献
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近红外光谱技术由于其操作简单、无需前处理、不破坏样品、无需化学试剂等特点受到人们的青睐,在众多领域得到研究和应用。本文就利用近红外光谱技术快速检测茶叶中粗纤维含量的方法进行研究,首先确定了茶叶样品粉碎时的最佳颗粒度和采集样品近红外光谱时的最佳装样厚度,选用135个茶叶样品作为试验对象,结合国标方法(GB/T 8310-2013)测定样品的粗纤维含量值,利用偏最小二乘方法建立了茶叶中粗纤维含量快速测定的近红外模型,并对60个未参加建模的茶叶样品进行了预测,将模型预测结果与国标方法结果进行成对结果 t检验,统计分析结果证明近红外方法与国标方法不存在显著差异,证明了近红外光谱法在茶叶中粗纤维快速检测中应用的可行性。 相似文献
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为利用烟叶碎片制备特色烟草浸膏,采用WY803号产香酵母菌处理烟叶碎片,优化产香工艺制备特色烟草浸膏。采用同时蒸馏萃取法采集烟草浸膏的香气成分,并利用气相色谱-质谱联用进行分析。结果表明,经WY803产香酵母菌处理烟叶碎片后所得到的特色烟草浸膏不仅具有增加烟气浓度、丰富烟香的作用,而且具有提高烟香细腻度和甜润性的作用;并为卷烟香气赋以特殊的醇和的酿甜香味,体现了淡雅香的中式卷烟特点。其优化产香工艺为将烟叶碎片水提物灭菌后,添加10%的高粱粉,接种1%的WY803。在30℃的条件下发酵14天。与未经产香处理的普通烟草浸膏的香味成分比较,该特色烟草浸膏成分中的特征香味成分有:呋喃酮、呋喃醇、苯乙醇、新植二烯、巨豆三烯酮、二羟基紫罗兰酮、2-乙酰基吡咯等。 相似文献
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Minghai Long Yikun Hua Xianguo Wang Yuekun Wang Chuan He Dongyou Huangfu 《Drying Technology》2018,36(1):52-62
Smoking food tobacco material include flue-cured tobacco leaves, expanded stems, and reconstituted tobacco sheets. As the main raw material in the cigarette industry, the quality of flue-cured tobacco leaves is very important to the smoking food products. The effects of different combined moistening and redrying treatments on the physicochemical and sensory changes of flue-cured tobacco leaves have been systemically studied. This work has demonstrated that the steam moistening and low-temperature slow redrying (SM–LTSR) processes can improve the moisture content and color uniformity of tobacco leaves (p?0.05). More importantly, the degradation of colorant and polyphenol precursors in tobacco leaves can be reduced for different redried lamina, and the average degradation amounts can be decreased by 30.63 and 22.41%, respectively. The total amount of volatile compounds can be decreased by 9.61% in comparison with the steam-water mixing moistening and high-temperature redrying (SWM–HTR) processes. We conclude that the mid-high-grade tobacco leaves should be processed through the SM–LTSR treatments to improve the color brightness, quality stability and retain flavor, while the low-grade tobacco leaves should be processed through the SWM–HTR processes to improve the processability, aftertaste and remove the offensive odor in actual threshing and redrying. This work has formed the suitable processing methods for different qualities of tobacco leaves and has laid the theoretical foundation for the quality improvement and flavor preservation of tobacco leaves. 相似文献
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