气质联用与电子鼻对不同包装货架期线椒检测分析

Detection analysis of line peppers with different packaging at different shelf life by GS-MS and electronic nose

运用HS-SPME-GC-MS和电子鼻2种技术,对10℃贮藏15 d后进行常温货架期间线椒的挥发性物质进行检测分析,并讨论3种不同包装(无包装、16μm PE、20μm PE)、不同货架期对挥发性成分的影响。结果表明:线椒的挥发性物质主要是由酯类、醛类和醇类物质组成,无包装组(A组)果实醇类和酯类物质相对含量最高,其次是16μm PE膜包装组(B组),20μm PE膜包装组(C组)最小,C组醛类物质相对含量最大;A、B、C组的醛类物质随着货架期的延长而降低,酯类挥发性物质则随着货架期的延长而增加,C组的保鲜效果最好;电子鼻分析结果显示,货架期1 d B、C组区分效果不理想;随着贮后货架时间的延长,不同包装组间的差异越明显,电子鼻区分效果也越好。电子鼻可以对不同货架期、不同包装厚度的线椒较好的判别区分,线椒挥发性成分受包装膜厚度以及时间长短的影响很大,LDA方法优于PCA方法。因此,电子鼻对线椒整体气味特征进行判别具有可行性。

Volatile substance of line peppers during room temperature shelf life after storage 15 days at 10 ℃ was detected and analyzed by headspace solid-phase micro extraction combined with gas chromatography mass spectrometry（HS-SPME-GC-MS） and electronic nose. The aim was discussed the effects of volatile components using three kinds of different packaging（no packaging, 16 μm PE,20 μm RE） at different shelf life. The results showed that volatile substance of line peppers was mainly composed of esters,ldehydes and alcohols,none packaging group（group A） fruit alcohols and esters relatively highest,20 μm PE film packing group（group C） was lower than 16 μm PE film packing group（group B）,group C had the maximum relative content of aldehydes. Aldehydes reduced and esters increased of group A, B,C with extended shelf life,group C（20 μm PE packaging） had the best preservation. Electronic nose analysis showed that group B and C distinction was not ideal at shelf life of 1 d,the difference in volatile substance was more distinguished between groups in different packaging by electronic nose detection with extended shelf life. Electronic nose could be used for judgment distinguish of line peppers at different shelf life and different packaging thickness,volatile components of line peppers were affected by packaging film thickness and the length of time a lot. Therefore, discriminate of line peppers different packaging at different shelf life was feasible by electronic nose.