Analysis of sterols: a novel approach for detecting juices of pineapple, passionfruit, orange and grapefruit in compounded beverages
✍ Scribed by Ng, Lay-Keow; Hupé, Michel
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 242 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0022-5142
No coin nor oath required. For personal study only.
✦ Synopsis
Direct GC/MS analysis of the hexane extracts of fruit juices provides an efficient means for demonstrating that very di †erent sterol patterns exist in the juices of pineapple, passionfruit and the two citrus fruits, orange and grapefruit. Ergostanol and stigmastanol were found to be the sterol markers for pineapple juice, while passionfruit juice was characterised by the presence of an unidentiÐed but unique sterol referred to as compound C. Juices of orange and grapefruit yielded very similar sterol proÐles. They were readily distinguished from pineapple and passionfruit juices by a higher stigmasterol/campesterol ratio. Valencene/nootkatone response ratio in the hexane extracts was employed to aid in the di †erentiation of the two citrus juices. Matrix e †ects on the determination of sterol and sesquiterpenoid distributions were found to be insigniÐcant. Although natural variation and absolute uniqueness of the sterol proÐle for each of the four fruit juices were not established due to the relatively small number of fruit samples examined, the results of several compounded beverages clearly point to the potential usefulness of sterol proÐles for detecting juices of orange, grapefruit, pineapple and passionfruit in mixed drinks.
1998 SCI.