Ethanol levels in pears were determined according to the method as described by Chervin et al. [24] using a
Chrompack (HP, USA) HP5890A gas chromatograph, with a back flush. Detector: N2-stabilized FID, columns:
a WCOT fused silica 25 m × 0.53 mm ID, CP sil 5CB pre-column, and a WCOT fusef silica 50 m × 0.53 mm ID,
CP sil 8 CB column. The carrier gas was helium (flow 30 ml/min)