Efficacy of fermentation parameters on protein quality and microstructural properties of processed finger millet flour
2021
G, Gowthamraj | M, Raasmika | Narayanasamy, Sangeetha
The present study aims to explore the outcome of processing methods such as fermentation; treatments using lemon juice (T₁), sodium chloride (T₂), lemon juice followed by sodium chloride (T₃) and fermentation followed by treatment-T₃ on the quality characteristics of processed finger millet flour to develop a specialized low protein food supplement for a protein-related inborn error of metabolic disorders. The clean dirt-free finger millet grains were made into slurry subjected to treatment T₁ (FMFT₁), T₂ (FMFT₂), T₃ (FMFT₃), fermentation for 8–36 h with 4 h intervals using yoghurt as starter culture (FFMF) and fermentation (8–36 h) followed by treatment T₃ (FFMFT₃). The acidity of the finger millet slurry significantly increased with the increase in fermentation time when compared to control. The IVPD was found to be 89% in FFMF (20 h) sample which was significantly higher than the IVPD of control sample flour (27%). However, the crude protein content (%), the protein fractions and the IVPD of FFMFT₃ (8–36 h) samples were found to be lesser than the FFMF (8–36 h) samples. The findings were further ensured by the results of scanning electron microscopic images and FT-IR spectra which showed the morphological and chemical modifications caused by the processing methods. The setback and breakdown viscosity of control (945 cP and 664 cP respectively) approximately reduced to two-third in FFMF (20 h) samples and one-third for FFMFT₃ samples (303 cP and 286 cP respectively). From the study, it is evident that the processing method of fermentation followed by treatment-T₃ could be utilized in the development of low protein food supplements.
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