AbstractThe present study aims at optimizing the process variables for development of horse gram flour incorporated biscuits, high in protein and dietary fiber. Box–Behnken design was employed to optimize the levels of three independent variables viz. flour: fat ratio, % whole wheat flour (WWF) replaced by horse gram flour (HF) and baking time (minutes) and their effects were determined over the response parameters that is, overall acceptability, fat content (g/100 g), dietary fiber (g/100 g), hardness and color difference (ΔE). Results showed that increasing the flour: fat ratio and % of WWF replaced by HF significantly decreased (p < 0.05) the overall acceptability. Fat content of biscuits was also significantly affected by the flour: fat ratio and % of HF. The hardness and dietary fiber content of biscuits was found to be positively correlated with flour: fat ratio and % WWF replaced by HF. It was observed that prolonging the baking time led to an increase (p < 0.05) in the hardness and color difference of biscuits. The optimized nutritious biscuits were obtained at flour: fat ratio 4.15:1, 23.5% WWF replaced by HF and baking time 29 min. Horse gram flour incorporated biscuits thus optimized were high in dietary fiber (9.37 g/100 g) and low in fat (16.41 g/100 g). Other responses predicted in terms of OA, hardness and color difference (ΔE) were 7.03, 31.53 N and 8.01 respectively. The study thus explains that the under‐utilized grain legume – horse gram can be successfully incorporated to develop fiber rich nutritious biscuits with good consumer acceptability.Novelty Impact StatementIn this study, response surface methodology (RSM) was used to develop and optimize horse gram flour incorporated biscuits by supplementing horse gram flour to whole wheat flour in different ratios. These biscuits being high in dietary fiber, protein and low in fat may be a better alternative for the commercially available biscuits, especially for the diabetics. Also, this may improve the status of underutilized indigenous legume horse gram.
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