title: Synthesis and characterization of bacterial cellulose sulfates using a SO₃/pyridine complex in DMAc/LiCl.
abstract: Various sodium bacterial cellulose sulfates (SBCS) were prepared via the homogeneous sulfation of bacterial cellulose (BC) with a SO3/pyridine (Py) complex in a dimethyl acetamide/lithium chloride solution. The SBCSs were characterized using Fourier transform infrared spectroscopy, X-ray diffraction (XRD), carbon nuclear magnetic resonance spectroscopy, gel permeation chromatography, elemental analyses, and thermal gravimetric analyses. A variety of conditions (including various amounts of SO3/Py, temperatures, and reaction times) were utilized to obtain SBCSs with DS values that ranged from 0.10 to 1.50. The XRD profiles indicated that the SBCSs had a cellulose II analog polymorphous structure. The differences between BC and microcrystalline cellulose (MC) were studied in their respective reactions. BC is more reactive than MC in both the sulfation and depolymerization processes. The order of reactivity for COH is C6>C2>C3 for both BC and MC. Cellulose sulfates with DS values >0.31 were soluble in deionized water.
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan 570228, PR China.
authors.forename: Ziyu
authors.initials: Z
authors.lastname: Qin
authors.forename: Li
authors.initials: L
authors.lastname: Ji
authors.forename: Xueqiong
authors.initials: X
authors.lastname: Yin
authors.forename: Li
authors.initials: L
authors.lastname: Zhu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lin
authors.forename: Jinming
authors.initials: J
authors.lastname: Qin
mesh_terms: D000081:Acetamides / Q000737:chemistry*; D001419:Bacteria / Q000737:chemistry*; D002482:Cellulose / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D060326:Chemistry Techniques, Synthetic; D004355:Drug Stability; D018021:Lithium Chloride / Q000737:chemistry*; D008970:Molecular Weight; D011725:Pyridines / Q000737:chemistry*; D012995:Solubility; D013461:Sulfur Oxides / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000081:Acetamides; D011725:Pyridines; D013461:Sulfur Oxides; D014867:Water; D002482:Cellulose; C020254:cellulose sulfate; D018021:Lithium Chloride; C011118:sulfur trioxide; C013959:dimethylacetamide; C023666:pyridine; C109691:microcrystalline cellulose
keywords: Bacterial cellulose; Characterization; SO(3)/Py; Sulfation