Archives of Acoustics, 39, 2, pp. 267-275, 2014
10.2478/aoa-2014-0031

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

Xin GAO
Kunming University of Science and Techonolgy
China

Keli CHEN
Kunming University of Science and Techonolgy
China

Heng ZHANG
Kunming University of Science and Techonolgy
China

Lincai PENG
Kunming University of Science and Techonolgy
China

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).
Keywords: ultrasonic pretreatment; ultrasound power; bagasse pith; parenchyma cellulose; cellouronic acid sodium salt; 4-acetamide-TEMPO.
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DOI: 10.2478/aoa-2014-0031

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