基于质构仪穿刺模式的烟叶脆性定量评价方法

A quantitative evaluation method for tobacco leaf brittleness based on puncture mode of texture analyzer

为客观评价烟叶脆性,利用质构仪的穿刺模式建立了烟叶脆性的定量评价方法,通过单因素及响应面优化确定了最佳测试参数;并应用该方法评价了不同地区、不同部位以及不同含水率烟叶样品的脆性差异。结果表明:①质构仪测定烟叶脆性的最佳条件:探头型号为P/2N针型探头,测前、测试和测后速率分别为1.0、1.5和10.0 mm/s,测试距离为5 mm,触发力为5 g,该方法的日内和日间精密度分别小于4.50%和3.00%。②烟叶脆性在不同地区间存在一定差异;在不同部位间差异明显,呈现的趋势为下部烟叶>上部烟叶>中部烟叶。③烟叶含水率对其脆性影响显著,含水率<20%时,烟叶脆性随含水率增加而显著降低。④随环境湿度的上升,烟叶穿透孔径逐渐变小,断面平整,微破裂较少或不发育。

In order to objectively evaluate the brittleness of tobacco leaves,a quantitative evaluation method was developed by using the puncture mode of a texture analyzer.The optimized test parameters were determined through single factor and response surface methodology,and the differences of brittleness of tobacco leaf samples with different moisture contents from different planting areas and stalk positions were evaluated by the developed method.The results showed that:(1)The optimized conditions of the texture analyzer for determining tobacco leaf brittleness were based on the P/2N needle probe,the speeds before,during and after test 1.0,1.5 and 10.0 mm/s respectively,test distance 5 mm,and trigger force 5 g.The intra-and inter-day precisions of this method were less than 4.50%and less than 3.00%respectively.(2)There were some differences in tobacco leaf brittleness among leaves from different planting areas;however,there were significant differences among leaves from different stalk positions in the rank of lower leaf>upper leaf>middle leaf.(3)The moisture content in tobacco leaf significantly affected its brittleness.When the moisture content was less than 20%,tobacco leaf brittleness decreased significantly with the increase of moisture content.(4)With the rise of environmental humidity,the diameter of puncture in tobacco leaf decreased gradually,the section became smooth,and the microcracks were less and not developing.