Table 1 shows the proximate compositions of the exotic fruit fibre concentrates, which had relatively low moisture content with no statistically significant differences (p > 0.05) between samples.
As regards lipid contents, the exotic fruit fibre concentrates had very low fat contents, with values (p < 0.05) ranging from 0.8 g/100 g d.m. in passion fruit and 5.9 g/100 g d.m. in mango. These values are consistent with the amounts present in other fibre concentrates obtained from fruit co-products, such as bambangan peel (2.9 g/100 g), grapefruit (1.0 g/100 g) and apple (4.5 g/100 g).
Protein contents (p < 0.05) ranged between 4.0 g/100 g d.m. in pineapple and 8.0 g/100 g d.m. in mango. The values obtained were higher than reported by Viuda-Martos et al. (2012) in pomegranate peel powder or by Sánchez-
Zapata et al. (2011) in date co-product.
Ash contents were higher than previous reports for apple pomace or tiger nut co-products.
Carbohydrate contents of exotic fruit co-products varied significantly (p < 0.05) from 6.5 g/100 g d.m. in passion fruit to 22.2 g/100 g d.m. in guava fibre.