Abstract

• The present work deals with isolation and identification of liquid glucose from sweet potato tuber Ipomoea batatas L. (Shwe-ka-zun-u). From the preliminary phytochemical investigation, alkaloids, carbohydrates, α-amino acids, flavonoids, glycosides, saponins, steroids, tannins, terpenoids, phenolic compounds, starch, organic acids, reducing sugars were found to be present and the cyanogenic glycosides was absent in the tuber of sweet potato. In addition, sweet potato tuber contains the content of water (42.15 %), total solid (57.85 %), nitrogen (0.192 %), ash (1.91 %), fat (0.72 %), starch (48.34 %) and crude fibre (1.97 %). According to ED XRF data analysis, K (65.705 %), Ca (21.918 %), Fe (6.025 %), Rb (3.487 %) and Mn (2.865 %) were observed. The contents of soluble matters using water, ethanol and petroleum were 6.01, 4.14 and 2.23 %, respectively. The yield percent and dextrose equivalent of liquid glucose prepared by enzymatic method and acid hydrolysis method were respectively found to be 11.95 and 11.04 %, 40.37 and 37.30., determined by Fehling's solution method. Similarly, the yield percent of liquid glucose prepared by enzymatic method and acid hydrolysis method were observed as 22.43 and 21.78 %, 75.78 and 73.58, respectively, determined by phenol-sulphuric acid assay. The prepared liquid glucose was characterized by paper chromatographic method. The characteristics of prepared liquid glucose obtained by enzyme hydrolysis and acid hydrolysis were indicated as specific gravity (1.08 and 1.02), refractive index (1.42 and 1.30), viscosity (1.5282 cP and 0.7864 cP), pH (4.4 and 4.8), water content (25.67 % and 31.95 %), total solid (74.33 % and 68.05 %) and sulphated ash (0.048 % and 0.069 %), respectively.