Characterization of xanthan gum produced from sugar cane broth

AbstractXanthan gum was produced by Xanthomonas campestris pv. campestris NRRL B-1459 using diluted sugar cane broth in experiments that lasted 24h. The components used were in g/L: 27.0 sucrose; 2.0 Brewer's yeast; and 0.8 NH4NO3. The mixture was fermented at 750rpm and 0.35vvm. These conditions produced xanthan gum with the desired molecular weight and total sugar content, which were 4.2×106Da and 85.3%, respectively. The sugar consisted of 43% glucose, 32% mannose and 24% glucuronic acid in a 1.79:1.33:1 ratio. The xanthan gum produced by this method was confirmed by comparing the infrared spectrum of commercial xanthan gum with the infrared spectrum of the xanthan gum produced using this method. The infrared spectra were very similar, which confirmed the identity the xanthan gum produced using our method. The xanthan gum was also evaluated using Proton Nuclear Magnetic Resonance (1H NMR)

USE OF BARU OIL (Dipteryx alata Vog.) TO PRODUCE BIODIESEL AND STUDY OF THE PHYSICAL AND CHEMICAL CHARACTERISTICS OF BIODIESEL/PETROLEUM DIESEL FUEL BLENDS

We describe production of methyl and ethyl esters derived from baru oil (Dipteryx alata Vog.). Water and alcohols are removed from the biodiesel obtained by simple distillation. We study the acidity, density, iodine number, viscosity, water content, peroxide number, external appearance, and saponification number of the oil, its methyl and ethyl esters (biodiesels) and their blends (B5, B10, B15, B20, and B30) with commercial diesel fuel