The development of convenience foods by incorporating nutrient-rich pulses such as peas and lentils will tremendously alter the future of pulse and cereal industries. However, these pulses should be size-reduced before being incorporated into many food products. Therefore, an attempt was made to adapt roller mill settings to produce de-husked yellow pea and red lentil flours. The milling flowsheets unique to yellow peas and red lentils were developed in producing small, medium, and large flours with maximum yield and flour quality. This study also investigated the differences in chemical composition, physical characteristics, and particle size distributions of the resultant six flour fractions. The kernel dimensions and physicochemical properties of the whole yellow pea and red lentils were also studied to develop customized mill settings. Overall, the mill settings had a significant effect on the physical properties of different particle-sized flours. The geometric mean diameters of different particle-sized red lentil flours were 56.05 μm (small), 67.01 μm (medium), and 97.17 μm (large), while for yellow pea flours they were 41.38 μm (small), 60.81 μm (medium), and 98.31 μm (large). The particle size distribution of all the flour types showed a bimodal distribution, except for the small-sized yellow pea flour. For both the pulse types, slightly more than 50% flour was approximately sizing 50 μm, 75 μm, and 100 μm for small, medium, and large settings, respectively. The chemical composition of the flour types remained practically the same for different-sized flours, fulfilling the objective of this current study. The damaged starch values for red lentil and yellow pea flour types increased with a decrease in flour particle size. Based on the Hausner’s ratios, the flowability of large-sized flour of red lentils could be described as passable; however, all the remaining five flour types were indicated as either poor or very poor. The findings of this study assist the millers to adapt yellow pea and red lentil milling technologies with minor modifications to the existing facilities. The study also helps in boosting the production of various baking products using pulse and wheat flour blends to enhance their nutritional quality.
Teff (Eragrostis tef) has gained wide popularity mainly attributed to its gluten‐free nature catering the needs of gluten‐sensitive population. The higher water absorption capacity and gelling properties of teff flour promote its food applications, especially in the baking sector. The nutritional and sensorial properties of teff flour have been studied by incorporating with wheat flour at different proportions, but no study has reported the impact of various milling methods on the rheological and bread‐making properties of teff flour. In this regard, the present study is envisaged to assess the physical, rheological, and bread‐making properties of teff flour acquired over roller, hammer, and pin milling. Among the milling methods, the distribution of particles was more uniform in case of roller mill, while finer particles were obtained for the pin milled flour fractions with 60% of the sample falling below 90 μm. It was observed that the protein, crude fiber, and crude fat contents for all the flours were on par with each other irrespective of the milling method. Whereas, the pasting properties varied significantly between the flours obtained from different milling methods. It was observed that the pin milled flour bread was superior in quality owing to its higher loaf volume (331.67 cm3) with lower hardness value (5.99 N). The present study indicates the fact that pin mill could be more suitable for milling brown teff grains owing to the better pasting and bread‐making properties.
There has been a growing demand for pulses due to the nutrition, health benefits, and agronomical advantages, along with the recommendation of international organizations to diversify the use of pulses. Lentil, yellow pea, and chickpea were studied for their effect on the quality of the bread when incorporated into refined wheat flour. The pulse grains were roller milled into different particle sizes (small: 44-59 μm, medium: 70-85 μm, and large: 95-104 μm) with similar composition, and each refined pulse flour was incorporated in refined wheat flour at levels of 5, 12.5, and 20% (wt/wt). The flours were characterized for particle size distribution, starch damage, proximate composition, water retention, and dough mixing properties, followed by baking test and texture analysis. The particle size of the pulse flours did not significantly affect the bread volume or the texture, while increasing the pulse flour incorporation decreased the bread specific volume from 5.0 to 3.4 cm 3 /g and the hardness of the bread increased from 3.9 to 9.9 N at the maximum incorporation level. The crust color darkened as pulse flour incorporation was increased, while the effect on crumb color was marginable. Among the three pulses, chickpea performed better compared to lentil and yellow pea, and yellow pea resulted in bread with lower volume at all levels of incorporation. Enriched bread can be produced by incorporating pulse flours at up to 12.5% (wt/wt) without significant effect on the quality of bread, with chickpeas possessing better baking properties than yellow pea or lentil.
Proso millet is a nutritious, sustainable, and gluten free food which is currently underutilized. They can be incorporated into the grain industry and provide much needed healthy alternatives. Efficient grinding method should be adopted for easy incorporation. This study aimed to investigate the effect of three different methods of grinding namely, roller milling (RM), pin milling (PM), and hammer milling (HM) on proso millet flour rheology and baking properties for food application. The milling flow sheet was developed toward the production of the quality whole grain flour. The particle size distribution of all the flours showed bi-modal distribution except for the RM flour.The PM produced the flour with the finest particles with geometric mean diameter of 82 μm. The study also revealed that starch damage in the PM flour (4.64%) was higher than RM (2.46%) and HM flour (2.51%). The nutritional composition was not significantly affected by different grinding methods. Pasting properties of the flour were also affected by the grinding method applied. Rapid Visco Analysis profile showed pin mill flour to have a higher peak viscosity (PV) (2,295 cP) compared to HM (2,065 cP) and RM flour (2,130 cP). Finally, this study demonstrated that the production of bread from proso millet flour with desirable quality and texture is possible.The grinding method did not affect the specific volume of bread loaves and C-cell characteristics. The specific volume of the breads ranged from 2.40 to 2.52 cm 3 /g. This study will help in promoting and producing value-added proso millet food products with enhanced nutritional quality. K E Y W O R D S bread texture, gluten free baking, hammer milling, pin milling, proso millet, roller milling 1 | INTRODUCTION Millet is generic term for a range of annual small-seeded cereals in the two tribes Paniceae and Chlorideae of the family Poaceae (true grass) (Das, Khound, Santra, & Santra, 2019; Lu et al., 2009). Commonly cultivated species of millet grown across the world include pearl millet (Pennisetum glaucum [L.] R.Br.), proso millet (Panicum miliaceum L.), finger millet (Eleusine coracana [L.] Gaertn.), foxtail millet (Setaria italica [L.] P. Beauvois), kodo millet (Paspalum scrobiculatum L.), barnyard millet (Echinochloa esculenta [A.Braun] H.Scholz), and little millet (Panicum sumatrense Roth ex Roem. & Schult) (Das et al., 2019). Millet serves as a major source of energy and protein for people living in arid and semiarid regions especially in India, Africa, and China (Habiyaremye et al., 2017).
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