title: Acetylation of bacterial cellulose catalyzed by citric acid: Use of reaction conditions for tailoring the esterification extent.
abstract: Bacterial cellulose (BC) nanoribbons were partially acetylated by a simple direct solvent-free route catalyzed by citric acid. The assay of reaction conditions within chosen intervals (i.e. esterification time (0.5-7h), catalyst content (0.08-1.01mmol/mmol AGU), and temperature (90-140°C)), illustrated the flexibility of the methodology proposed, with reaction variables which can be conveniently manipulated to acetylate BC to the required degree of substitution (DS) within the 0.20-0.73 interval. Within this DS interval, characterization results indicated a surface-only process in which acetylated bacterial cellulose with tunable DS, preserved fibrous structure and increased hydrophobicity could be easily obtained. The feasibility of reusing the catalyst/excess acylant in view of potential scale-up was also illustrated.
authors: Grupo de Biotecnología y Biosíntesis, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina.
authors: Jhon Alejandro
authors: JA
authors: Ávila Ramírez
authors: Facultad de Ingeniería Agroindustrial, Universidad Pontificia Bolivariana, Circular 1° N° 70-01, Medellín, Colombia.
authors: Catalina
authors: C
authors: Gómez Hoyos
authors: Laboratorio de Sólidos Amorfos, Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long (INTECIN), Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, C1063ACV, Buenos Aires, Argentina.
authors: Silvana
authors: S
authors: Arroyo
authors: Grupo de Biotecnología y Biosíntesis, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina; Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Buenos Aires, Argentina.
authors: Patricia
authors: P
authors: Cerrutti
authors: Grupo de Biotecnología y Biosíntesis, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Electronic address: mforesti@fi.uba.ar.
authors: María Laura
authors: ML
authors: Foresti
mesh_terms: D000107:Acetylation; D002384:Catalysis; D002482:Cellulose / Q000031:analogs & derivatives* / Q000648:ultrastructure; D019343:Citric Acid / Q000737:chemistry*; D004951:Esterification; D041822:Gluconacetobacter xylinus / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000031:analogs & derivatives* / Q000648:ultrastructure
chemical_list: D011135:Polysaccharides, Bacterial; D019343:Citric Acid; D002482:Cellulose
keywords: Acetylation; Bacterial cellulose; Citric acid; Reaction conditions