ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Volatile production in ‘Fuji’ apples stored under different atmospheres by headspace/gas chromatography and electronic nose

Lopez M.L.; Echeverria G.; Graell J.; Brezmes J.; Puy J. and Correig X.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.122

2004

บทคัดย่อ

Volatile production, sensory acceptance and electronic nose responses were measured in ‘Fuji’ apples (Malus x domestica Borkh) to evaluate the effects of different storage conditions, storage periods and shelf-life days. Apples harvested at 185 days after full bloom were analysed after 5 and 7 months of cold storage in normal atmosphere (AIR: 1% O₂ + 2% CO₂ and 3% O₂ + 2% CO₂). During post-storage ripening, apples were kept at 20°C for 1, 5 and 10 days before analytical and sensory measurements were made. Volatile production was obtained involving headspace/gas chromatography methods; electronic nose measurements by a sensor array of semiconductor gas, and sensory acceptance by a semi-trained panel.

Sensor responses registered by 21 different sensors were used to classify the apples using Principal Component Analysis (PCA). This PCA model containing data from all fruits (at harvest and after storage) showed that it was possible to identify fruits from harvest or storage; it was also possible to differentiate between AIR-fruits and CA-fruits. Principal components 1 (PC1) and 2 (PC2) respectively accounted for 63 and 30% of the total variability. A PCA model containing o­nly data of stored fruits revealed differences according to different storage periods; in this case PC1 and PC2 respectively accounted for 50 and 20% of the total variability. o­n the other hand, a PCA involving volatile production, sensory acceptance and sensor responses corresponding to all fruits allowed a better differentiation between fruits from 1% O₂ + 2% CO₂ and 3% O₂ + 2% CO₂ atmosphere, with an explained variance of 58% (two first PCs).