The proximate composition of the raw and defatted passion fruit seeds is shown in Table 1. The raw seed was rich in total dietary fibre (TDF) (64.8 g/100 g) and crude lipid (24.5 g/100 g), and possessed small amounts of crude protein (8.25 g/100 g), ash (1.34 g/100 g) and carbohydrate (1.11 g/100 g). Moreover, the seed was almost free of digestible starch (<0.01 g/100 g). After lipid removal, the TDF content was greatly increased up to 85.9 g/100 g defatted seed. In the agricultural byproducts of apple, citrus fruits, corn, oat, wheat and some other fruits and greens, TDF contents ranged from 10.2 to 87.9 g/100 g. Insoluble dietary fibre (IDF) (84.9 g/100 g defatted seed) was the predominant fibre fraction (98.8% of TDF). In the pomace and agricultural byproducts of many other fruits and vegetables, insoluble fibres were
also reported to be the major fibre fraction. Since the consumption of insoluble fibres is beneficial to intestinal peristalsis by increasing fecal bulk and decreasing transit time, the defatted passion fruit seed could be a good source of insoluble fibre with desirable physiological effects.
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