Fiber and Polymer Science, University of California, Davis, CA 95616, USA.
Fiber and Polymer Science, University of California, Davis, CA 95616, USA.
Carbohydr Polym. 2015 May 20;122:60-8. doi: 10.1016/j.carbpol.2014.12.064. Epub 2015 Jan 3.
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.
番茄皮中的纯纤维素可分别通过酸化亚氯酸钠法或无氯碱性过氧化物法，以 10.2-13.1%的得率提取。采用硫酸水解法（64%硫酸，8.75ml/g，45°C，30min），可得到产率为 15.7%的带负电荷（ζ=-52.4mV，0.48%硫含量）且呈扁平纺锤形（长：宽：厚=41:2:1）的纤维素纳米晶（CNC）。CNC 可从稀水溶液中轻易组装成高结晶度（80.8%）纤维素 Iβ纤维质体，主要含有亚微米纤维（φ=260nm）和少量相互连接的纳米纤维（φ=38nm），比表面积为 21.7m2/g，孔体积为 0.049m3/g。在 1:1v/v 的叔丁醇/水混合溶剂中，CNC 可组装成更均匀的纳米纤维，其平均宽度为 42nm，比表面积（101.8m2/g）、中孔率和孔体积（0.4m3/g）显著提高。
