บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Tomato quality evaluation using electronic nose systems to complement sensory analysis.

Berna A.Z., Buysens S., Lammertyn J., Saevels S., Di Natale C., Nicolai B.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.47

2004

บทคัดย่อ

Tomato quality evaluation using electronic nose systems to complement sensory analysis.  In Belgium a large number of new tomato cultivars are yearly submitted to several quality evaluations and growth characteristics before getting commercialized, in order to select the most valuable varieties.Flavor (aroma and taste) is o­ne of the main quality attributes evaluated in tomatoes.Among the different methods to evaluate aroma, sensory analysis have been widely used, however recently, electronic noses are promising fast instrumental means for aroma evaluation in food.The aim of this study was to compare, discuss and illustrate the performances of electronic nose systems and sensory analysis during tomato aroma evaluation.

Twenty-four tomato cultivars were considered for the experiment.They were harvested at the red-ripe stage of maturity.Sensory evaluations were performed by 6 experts at the Center for Applied Vegetable Research East-Flanders.The panel was previously trained to recognise tomato/green, flower, fruity/almond, green/grass and overall aroma attributes in tomatoes.Two electronic nose system: a Libra nose (E-nose) and a mass spectrometry base electronic nose (MSE-nose) were considered for instrumental analysis.The detection principle of the Libra Nose was based o­n eight quartz microbalances sensors (QMB) coated by modified metallo-porphyrins.The MSE-nose analysis consisted of a solid phase micro-extraction coupled to gas chromatography-mass spectrometry.The volatile samples were introduced into the GC/MS without prior separation and a mass spectrometry pattern, characteristic of the unresolved mixture of volatiles, was then recorded.The data were analysed with multivariate statistics.

In first place, the electronic nose systems were compared with each other and with those from the sensory panel.The results suggest that the E-nose and the MSE-nose can complement traditional chemical and sensory approaches to the selection of new tomato cultivars.Details of the results will be discussed in the final paper.