Fig. 1. Visual appearance of purple sweet potato and bambara tuber-bread product. F0, tuber bread with 100% purple sweet potato filling; F1, tuber bread with 80% purple sweet potato and 20% bambara bean filling; F2, tuber bread with 60% purple sweet potato and 40% bambara bean filling; F3, tuber bread with 40% purple sweet potato and 60% bambara bean filling.
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