晾制密度对雪茄烟叶膜脂过氧化作用及品质的影响

为了解不同晾制密度条件下膜脂过氧化水平对雪茄烟叶品质的影响,本文设计了杆距10 cm、杆距20 cm、杆距30 cm 3种晾制密度,研究其对雪茄烟叶所在晾房的温湿度、烟叶含水率、丙二醛含量、抗氧化酶活性、多酚和化学成分的影响。结果表明,杆距20 cm的晾制密度过氧化水平最低,且与晾房内温湿度相关性不显著,只与含水率相关,说明该晾制密度较其他晾制密度有利于避免膜脂过氧化水平的升高;烟叶中过氧化物酶、超氧化物歧化酶、过氧化氢酶和多酚含量均在杆距20 cm晾制密度下最高,有利于增强烟叶的抗氧化能力;多酚氧化酶活性在杆距10 cm晾制密度下最高;化学成分以杆距20 cm处理较为协调。因此杆距为20 cm的晾制密度有利于提高抗氧化类物质,减轻膜脂过氧化水平的伤害,提升烟叶品质。

Effects of air drying density on membranous lipid peroxidation and quality of cigar tobacco leaf

In order to understand the influence of different drying density on membranous lipid peroxidation level and cigar tobacco leaf quality, an experiment was conducted with three treatments (stem distance of 10 cm, stem distance of 20 cm, stem distance of 30 cm) of drying system to measure the temperature and humidity of drying room, tobacco leaf water content, malondialdehyde (MDA) content, antioxidant enzyme activity, polyphenol and the chemical compositions. The level of peroxidation in the treatment of 20 cm was the lowest, and had no significant correlation with the temperature and humidity in the drying room, but correlated with the water content. The activities of peroxidase (POD), superoxide dismutase (SOD), catalase (CAT), and polyphenol content in leaves were the highest under the drying density of 20 cm, indicating that the drying density of 20 cm was conducive to the improvement of antioxidant enzyme activity, polyphenol content, and antioxidant capacity of tobacco leaves. The activity of polyphenol oxidase (PPO) was highest at the drying density of 10 cm and the chemical components were coordinates in the treatment of 20 cm. Therefore, the air-curing density with a length of 20 cm is conducive to increasing antioxidants, reducing the damage caused by membranous lipid peroxidation and improving the quality of tobacco leaves.