title: The rheological properties of tara gum (Caesalpinia spinosa).
abstract: The rheological properties of tara gum, as affected by concentration, temperature, pH and the presence of salts and sucrose, were investigated by using steady and dynamic shear measurements and atomic force microscope observation. Tara gum exhibited non-Newtonian, pseudoplastic behaviour without thixotropy at tested concentrations (0.2-1.0%, w/v). Salts (CaCl2 and NaCl) led to a viscosity reduction, which was more sensitive to Ca(2+) than to Na(+). The gum had stable viscosity over a wide pH range (pH 3-11), and the influence of sucrose was concentration dependent. Increasing temperature from 20°C to 80°C decreased the gum viscosity. Frequency sweeps indicated that tara gum (1.0% w/v) behaved as a liquid at low frequency, and acted more like a gel at high frequency. With the decrease of concentration, tara gum may show a viscous property rather than an elastic one. These results are potentially useful for the application of tara gum in food processing.
authors.affiliation: College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Yanbei
authors.initials: Y
authors.lastname: Wu
authors.affiliation: College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ding
authors.affiliation: Institute of Agro-product Processing, Sichuan University, Chengdu 610065, PR China. Electronic address: jialirong@scu.edu.cn.
authors.forename: Lirong
authors.initials: L
authors.lastname: Jia
authors.affiliation: College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 610065, PR China. Electronic address: heq361@163.com.
authors.forename: Qiang
authors.initials: Q
authors.lastname: He
mesh_terms: D006863:Hydrogen-Ion Concentration; D053149:Plant Gums / Q000737:chemistry*; D012965:Sodium Chloride / Q000494:pharmacology; D013395:Sucrose / Q000494:pharmacology; D013696:Temperature; D014783:Viscosity
chemical_list: D053149:Plant Gums; C038612:tara gum; D012965:Sodium Chloride; D013395:Sucrose
keywords: Galactomannan (PubChem CID: 439336); Galactose (PubChem CID: 6036); Mannose (PubChem CID: 18950); Rheology; Salt; Sucrose; Tara gum; Temperature; pH