TY - JOUR
T1 - Chemical and physical characterization of galactomannan extracted from guar cultivars (Cyamopsis tetragonolobus L.)
AU - Liyanage, Sumedha
AU - Abidi, Noureddine
AU - Auld, Dick
AU - Moussa, Hanna
N1 - Publisher Copyright:
© 2015.
PY - 2015/11/5
Y1 - 2015/11/5
N2 - Guar gum, known as galactomannan, is a heteropolysaccharide of galactose and mannose. Because of its unique rheological properties, guar gum has a diverse range of applications in various industries (hydraulic fracturing, paper, textiles, pharmaceuticals, and food). Chemical and physical characterization of guar gum using different analytical techniques is very important to understand the gum chemistry, optimize its applications, and investigate the impact of the purification. Therefore, galactomannan extracted from two guar cultivars planted in West Texas was characterized using different analytical tools to elucidate the variation in the physical and chemical properties with various levels of impurities. The gum was extracted with minimal contamination with continuous sample assessment using Fourier transform infrared spectroscopy (FTIR) and was purified using ethanol precipitation. The purified and unpurified gum samples were characterized using high-performance liquid chromatography, thermogravimetric analysis, X-ray diffractometry, and FTIR spectroscopy to determine the mannose to galactose ratio, thermal stability, level of crystallinity and chemical composition, respectively. Pure guar galactomannan and food-grade guar gum were used as reference materials. The effect of sodium chloride and potassium chloride on guar gum was also investigated. Scanning Electron Microscopy was employed to visualize the morphology of guar seeds.
AB - Guar gum, known as galactomannan, is a heteropolysaccharide of galactose and mannose. Because of its unique rheological properties, guar gum has a diverse range of applications in various industries (hydraulic fracturing, paper, textiles, pharmaceuticals, and food). Chemical and physical characterization of guar gum using different analytical techniques is very important to understand the gum chemistry, optimize its applications, and investigate the impact of the purification. Therefore, galactomannan extracted from two guar cultivars planted in West Texas was characterized using different analytical tools to elucidate the variation in the physical and chemical properties with various levels of impurities. The gum was extracted with minimal contamination with continuous sample assessment using Fourier transform infrared spectroscopy (FTIR) and was purified using ethanol precipitation. The purified and unpurified gum samples were characterized using high-performance liquid chromatography, thermogravimetric analysis, X-ray diffractometry, and FTIR spectroscopy to determine the mannose to galactose ratio, thermal stability, level of crystallinity and chemical composition, respectively. Pure guar galactomannan and food-grade guar gum were used as reference materials. The effect of sodium chloride and potassium chloride on guar gum was also investigated. Scanning Electron Microscopy was employed to visualize the morphology of guar seeds.
KW - Cultivar
KW - Galactomannan
KW - Guar gum
KW - Heteropolysaccharide
KW - Purification
UR - http://www.scopus.com/inward/record.url?scp=84936952437&partnerID=8YFLogxK
U2 - 10.1016/j.indcrop.2015.05.013
DO - 10.1016/j.indcrop.2015.05.013
M3 - Article
AN - SCOPUS:84936952437
SN - 0926-6690
VL - 74
SP - 388
EP - 396
JO - Industrial Crops and Products
JF - Industrial Crops and Products
ER -