International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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Original Research Articles                      Volume : 8, Issue:4, April, 2019

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : /
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2019.8(4): 672-681

Physico-chemical and Rheological Properties of Karaya Gum (Sterculia urens Roxb.)
Pooja Sahu1*, P.S. Pisalkar1, S. Patel1 and Pratibha Katiyar2
1Department of Agricultural Processing and Food Engineering, SVCAET & RS, FAE, IGKV, Raipur-492012, Chhattisgarh, India
2Department of Plant Physiology, Agri. Bio-chemistry Medicinal Aromatic Plants, COA, IGKV, Raipur-492012, Chhattisgarh, India
*Corresponding author

Physico-chemical and rheological properties of any material are important from industrial point of view in order to understand the requirement of different process operations for its value addition as well as for its commercial utilization. The present study describes some of the important physico-chemical and rheological properties of Karaya gum. Efforts have been made to determine moisture content, bulk density, true density, tap density, bulkiness, porosity, Hausner’s ratio, Carr’s compressibility index (%), angle of repose (°), coefficient of friction (n) on glass, mild steel, plywood and rubber surfaces following the established methods for other similar food materials. The lumps of Karaya gum collected from the forest of Chhattisgarh were used in the present study. Both grits and powder samples were used for determination of the properties depending on the demand of the methodology. The values of different physical and chemical properties determined were; moisture content: 17.47 ± 0.44 (% wb), bulk density: 0.79 ± 0.02 (g/cm3), true density: 1.50 ± 0.17 (g/cm3), tap density: 0.90 ± 0.04 (g/cm3), bulkiness: 1.26 ± 0.03 (cm3/g), porosity: 46.76 ± 6.12 (%), hausner’s ration: 1.14 ± 0.06, carr’s compressibility index: 12.31 ± 4.19, angle of repose: 47.27 ± 2.91°, coefficient of friction 0.24 ± 0.03 N (glass), 0.43 ± 0.04 N (mild steel), 0.28 ± 0.01 N (plywood) and 0.47 ± 0.04 N (rubber), respectively. Values of ash content, pH, refractive Index, water activity, water holding capacity (per 100 ml), nitrogen (%) and protein (%) were determined to be 4.62%, 4.26, 1.336, 0.651, 84.76, 0.16 and 1.06, respectively. Karaya Gum is soluble in hot and cold water but insoluble in acetone, chloroform and ethanol. The viscosity of 1% Karaya gum solution was found to be varied from 619 to 1286 cp in the spindle rotational speed range of 20 to 100 revolutions per minute at room temperature of 24 -26oC.

Keywords: Karaya Gum (Sterculia urens), Rheological properties

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How to cite this article:

Pooja Sahu, P.S. Pisalkar, S. Patel and Pratibha Katiyar. 2019. Physico-chemical and Rheological Properties of Karaya Gum (Sterculia urens Roxb.).Int.J.Curr.Microbiol.App.Sci. 8(4): 672-681. doi:
Copyright: This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license.