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琯溪蜜柚柚皮精油中特征性醛类成分及其在紫外空气条件下的转化
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摘要
醛类成分是柑橘精油中关键性的风味成分。本文通过GC-MS,GC-O和感官评价的手段对冷磨法制备琯溪蜜柚柚皮精油中的醛类成分及其在紫外和空气条件下的转化过程进行研究。结果表明精油中共含有9种醛类,包括辛醛、壬醛、香茅醛、癸醛、顺势/反式柠檬醛、紫苏醛、十二醛和十二烯醛。在紫外线和空气条件下处理后,除香茅醛浓度出现上升外,其余的醛类浓度都发生显著降低。醛类成分的浓度降低导致了精油青草味和柠檬味评分的显著降低。GC-O结果表明,处理后,癸醛、顺式/反式柠檬醛和十二烯醛的稀释倍数发生显著降低。该结果为却类成分的贮藏和保护提供了参考。
Aldehydes are key aroma contributors of citrus essential oils.Guanxi honey pummelo essential oil(PEO) was investigated in its aldehydes constituents and their transformations induced by UV irradiation and air exposure by GC-MS,GC-0,and sensory evaluation.Nine aldehydes,i.e.,octanal,nonanal,citronellal,decanal,trans-citral,cis-citral,perilla aldehyde,dodecanal,and dodecenal were detected in PEO.After treatment,the content of citronellal increased,but the concentrations of other aldehydes decreased.Aldehyde transformation caused a remarkable decrease in the minty,herbaceous and lemon notes of PEO.After the treatment,the dilution folds of decanal,cis-citral,trans-citral,and dodecenal decreased dramatically.This result provides information for the production and storage of aldehydes-containing products.
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