title: Turmeric powder and starch: selected physical, physicochemical, and microstructural properties.
abstract: Turmeric powder and its starch were characterized for physical, physicochemical, and microstructural characteristics. X-ray diffractogram indicated that turmeric starch to be of B type. Dried and cured-dried turmeric powder samples showed higher water-holding capacity (3.62 and 4.78 g/g, respectively) compared to isolated starch (1.07 g/g) at 30 °C. Non-Newtonian shear-thinning characteristics were observed with turmeric powder dispersion containing 10% (w/w) solids. A power law model fitted well to correlate the shear-rate and shear-stress data (r= 0.993 to 0.999, P≤ 0.01) for both samples. Apparent viscosities of isolated turmeric starch and cured-dried turmeric powder dispersion containing 10% (w/w) solids were 1.29 ± 0.03 and 7.57 ± 0.39 mPa s, respectively. Microstructure of starch particles showed a smooth flat outer surface. The approximate length and breadth of isolated elliptical starches were 25 and 10 μm while the thickness was about 5 μm.
  
  
  CONCLUSIONS
  Isolation and characterization of starch from an unconventional source like turmeric rhizome indicate a potential application as a functional ingredient in foods and pharmaceutical industries including agglomerated products.
authors.affiliation: Central Food Technological Research Inst., Council of Scientific and Industrial Research, Mysore 570020, India.
authors.forename: Dhanalakshmi
authors.initials: D
authors.lastname: Kuttigounder
authors.forename: Jaganmohan Rao
authors.initials: JR
authors.lastname: Lingamallu
authors.forename: Suvendu
authors.initials: S
authors.lastname: Bhattacharya
mesh_terms: D000688:Amylose / Q000032:analysis; D055598:Chemical Phenomena; D030024:Curcuma / Q000737:chemistry*; D005511:Food Handling / Q000379:methods; D010316:Particle Size; D011208:Powders; D027343:Rhizome / Q000737:chemistry; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013213:Starch / Q000737:chemistry* / Q000302:isolation & purification; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D011208:Powders; D014867:Water; D013213:Starch; D000688:Amylose