title: Cellulose nanocrystal isolation from tomato peels and assembled nanofibers.
abstract: Pure cellulose has been successfully isolated from tomato peels by either acidified sodium chlorite or chlorine-free alkaline peroxide routes, at 10.2-13.1% yields. Negatively charged (ζ = -52.4 mV, 0.48 at% S content) and flat spindle shaped (41:2:1 length:width:thickness) cellulose nanocrystals (CNCs) were isolated at a 15.7% yield via sulfuric acid hydrolysis (64% H2SO4, 8.75 mL/g, 45 °C, 30 min). CNCs could be facilely assembled from dilute aqueous suspensions into highly crystalline (80.8%) cellulose Iβ fibrous mass containing mostly sub-micron fibers (ϕ = 260 nm) and few interconnected nanofibers (ϕ = 38 nm), with 21.7 m(2)/g specific surface and 0.049 m(3)/g pore volume. More uniformly nanofibers with average 42 nm width and significantly improved specific surface area (101.8m(2)/g), mesoporosity and pore volume (0.4m(3)/g) could be assembled from CNCs in 1:1 v/v tert-butanol/water mixture.
authors: Fiber and Polymer Science, University of California, Davis, CA 95616, USA.
authors: Feng
authors: F
authors: Jiang
authors: Fiber and Polymer Science, University of California, Davis, CA 95616, USA. Electronic address: ylhsieh@ucdavis.edu.
authors: You-Lo
authors: YL
authors: Hsieh
mesh_terms: D002482:Cellulose / Q000737:chemistry* / Q000302:isolation & purification*; D006868:Hydrolysis; D006878:Hydroxides / Q000737:chemistry; D018551:Solanum lycopersicum / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D016062:Porosity; D017680:Potassium Compounds / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D013499:Surface Properties
chemical_list: D006878:Hydroxides; D017680:Potassium Compounds; D013464:Sulfuric Acids; D012972:Sodium Hydroxide; D002482:Cellulose; C033158:sulfuric acid; C029943:potassium hydroxide
keywords: Cellulose isolation; Cellulose nanocrystals; Cellulose nanofibers; Self-assembly; Tomato peels