Inositols and carbohydrates in different fresh fruit juices

Juices from different fresh fruits (grapefruit, lemon, lime, mandarin, orange, guava, kiwifruit, apple, mango, peach, pear, pineapple, banana, bilberry, raspberry, strawberry, redcurrant and grape) were prepared in the laboratory. Inositols were analysed by GC as their trimethylsilyl derivatives; their identities were confirmed by GC-MS and retention of pure standards. Myo-inositol was present in most juices, (excepting those of redcurrant and banana, where no inositols were detected) varying from traces in raspberry up to 153 mg/100 g in kiwifruit. Chiro-inositol was present in all examined citrus juices and ranged from 7 mg/100 g in lemon up to 108 mg/100 g in mandarin. Scyllo-inositol was present in both grapes and citrus juices, appearing as traces in orange and attaining 15 mg/100 g in grapefruit.