The Preparation of Soluble Cellouronic Acid Sodium Salt by 4-Acetamide-TEMPO Mediated Oxidation of Ultrasound-Pretreated Parenchyma Cellulose from Bagasse Pith

The parenchyma cellulose isolated from bagasse pith was used as an alternative resource for preparation of water-soluble cellouronic acid sodium salt (CAS). The influence of ultrasound treatment on the cellulose was investigated for obtaining CAS by regioselective oxidization using 4-acetamide-TEMPO and NaClO with NaClO$_2$ as a primary oxidant in an aqueous buffer at pH 6.0. The yield, carboxylate content and polymerization degree (DP) of CAS were measured as a function of ultrasonic power, agitating time and cellulose consistency by an orthogonal test. The ultrasound-treated conditions were further improved by discussion of ultrasonic power, the most important factor influencing the yield and DP. An optimized CAS yield of 72.9% with DP value (DPv) of 212 was found when the ultrasonic strength is 550 W, agitating time is 3 h and cellulose consistency is 2.0%. The oxidation reactivity of cellulose was improved by ultrasonic irradiation, whereas no significant changes in crystallinity of cellulose were measured after ultrasonic treatment. Moreover, the ultrasound treatment has a greater effect on yielding CAS from parenchyma cellulose than from bagasse fibrous’ one. The CAS was further characterized by Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM).

[1]  B. Simionescu,et al.  Oxidized cellulose--survey of the most recent achievements. , 2013, Carbohydrate polymers.

[2]  Zdenka Peršin,et al.  Comparison study of TEMPO and phthalimide-N-oxyl (PINO) radicals on oxidation efficiency toward cellulose. , 2013, Carbohydrate polymers.

[3]  S. Coseri,et al.  Bromide-free oxidizing system for carboxylic moiety formation in cellulose chain. , 2012, Carbohydrate polymers.

[4]  A. Isogai,et al.  Cellulose nanofibrils prepared from softwood cellulose by TEMPO/NaClO/NaClO₂ systems in water at pH 4.8 or 6.8. , 2012, International journal of biological macromolecules.

[5]  A. Isogai,et al.  Relationship between length and degree of polymerization of TEMPO-oxidized cellulose nanofibrils. , 2012, Biomacromolecules.

[6]  A. Geissler,et al.  Analysis of carboxylate groups in oxidized never-dried cellulose II catalyzed by TEMPO and 4-acetamide-TEMPO. , 2012, Carbohydrate polymers.

[7]  Wenshuai Chen,et al.  Preparation of millimeter-long cellulose I nanofibers with diameters of 30–80 nm from bamboo fibers , 2011 .

[8]  Wenshuai Chen,et al.  Individualization of cellulose nanofibers from wood using high-intensity ultrasonication combined with chemical pretreatments , 2011 .

[9]  S. Coseri,et al.  Oxidation of Cellulose Fibers Mediated by Nonpersistent Nitroxyl Radicals , 2010 .

[10]  T. Iwata,et al.  Comparison study of TEMPO-analogous compounds on oxidation efficiency of wood cellulose for preparation of cellulose nanofibrils , 2010 .

[11]  Zoran Herceg,et al.  Advantages and disadvantages of high power ultrasound application in the dairy industry , 2009 .

[12]  A. Isogai,et al.  Oxidation of regenerated cellulose with NaClO2 catalyzed by TEMPO and NaClO under acid-neutral conditions , 2009 .

[13]  B. Simionescu,et al.  Mild and selective oxidation of cellulose fibers in the presence of N-hydroxyphthalimide. , 2009, Biomacromolecules.

[14]  Yong Huang,et al.  Arrangement of cellulose microfibrils in the wheat straw cell wall , 2008 .

[15]  Raymond Mawson,et al.  APPLICATIONS AND OPPORTUNITIES FOR ULTRASOUND ASSISTED EXTRACTION IN THE FOOD INDUSTRY-A REVIEW , 2008 .

[16]  R. Sun,et al.  Succinoylation of sugarcane bagasse under ultrasound irradiation. , 2008, Bioresource technology.

[17]  Chen Gang,et al.  Influence of ultrasound treatment on accessibility and regioselective oxidation reactivity of cellulose. , 2005, Ultrasonics sonochemistry.

[18]  A. Isogai,et al.  Depolymerization of cellouronic acid during TEMPO-mediated oxidation , 2003 .

[19]  Vijay Kumar,et al.  HNO3/H3PO4–NANO2 mediated oxidation of cellulose — preparation and characterization of bioabsorbable oxidized celluloses in high yields and with different levels of oxidation , 2002 .

[20]  S. Coseri,et al.  MILD OXIDATION OF CELLULOSE FIBERS USING DIOXYGEN AS ULTIMATE OXIDIZING AGENT , 2011 .