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Updated: Sep 20, 2025

Fruit Volatile Analysis Using an Electronic Nose
Published on: March 30, 2012
Exploring aroma changes in thermally and ultrasonically processed pomegranate juice based on multidimensional gas
Yuzhe Yan1, Peng Wang1, Wanying He1
1College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China.
None:
Flavor deterioration during juice processing limits industrial-scale pomegranate juice (PJ) production. To evaluate the effects of thermal and non-thermal processing on PJ flavor, three samples-pasteurized (PS), high-temperature short-time treated (HTST), and ultrasound-treated (US)-were analyzed against a fresh control (FJ). Totally 144 volatiles were identified by the combination of GC-MS and GC × GC-TOF-MS. Among, 16 was screened out as key aroma-active compounds of different PJs through GC-olfactometry/aroma intensity and relative odor activity values analysis. Quantitative descriptive analysis revealed pronounced variations in cooked flavor intensity across thermally processed samples (PS, HTST), while US exhibited a sensory profile comparable to FJ. Partial least squares regression aligned with the sensory profile. Further OPLS-discriminant analysis identified 8 and 11 key markers differentiating FJ from processed PJs, and thermal (PS, HTST) from non-thermal (US) treated PJs, respectively. Precursor addition elucidated formation pathways of major off-flavor compounds (dimethyl sulfide, methanethiol) in processed PJs.
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