Effects of processing on nutrient composition in guava- and jackfruit-based snacks

Guava and jackfruit are popular fruits in East Africa. With consideration of the high post-harvest losses of these two fruits and only seasonal availability, this study aimed to produce nutrient rich fruit-based snacks to decrease this problem and make use of surplus fruits during on-season. Given the nutritional situation in East Africa, these products were also developed to have a high content of desired nutrients. Next to either guava or jackfruit also mango, different nuts and lemon juice was partly added. Processing methods included cooking and drying, which are suitable for local households and small processing groups. Chemical analyses were implemented to determine nutrient contents before cooking, after cooking and after drying. Major results included that bars with guava and lemon juice contained the highest content of ascorbic acid, 81.19 and 48.18 mg/100 g FM before and after cooking, respectively; jackfruit-based samples without lemon juice after drying contained more phenolic content than guava-based samples; fruit bars with lemon juice had higher acidity; samples of guava contained more β-carotene than jackfruit. In conclusion, the fruit-nut-bars can provide a good option to process surplus fruits and provide essential nutrients to the local population in East Africa.   Key words: Guava, jackfruit, fruit-nut-bars, East Africa.