Studies on preparation of oligoglucosamine by oxidative degradation under microwave irradiation

Shao, Jianda; Yang, Yumin; Zhong, Qiqing

doi:10.1016/s0141-3910(03)00177-0

Cited by 103 publications

(55 citation statements)

References 5 publications

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“…It can be seen that no band was observed between 1650 and 1900 cm -1 , which allowed us to conclude that oxidative groups such as carboxylic, aldehyde, or carbonyl groups did not exist in LMWC. The results verified the rupture of β-(1,4) glucoside bonds in macromolecule to be the basic process during amino groups of chitosan protection by acids without resulting in the ring-opening oxidation of glucosamine repeating units (Shao et al 2003).…”

Section: Ftir Analysis Of Original Chitosan and Lmwcsupporting

confidence: 67%

Synthesis and Characterization of Low Molecular Weight Chitosan

Yuan¹,

Jiang²,

Xing³

et al. 2015

BioResources

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Chitosan can be widely used in many areas owing to its unique properties, although its poor solubility in water is still a limiting factor. In the present study, low molecular weight chitosan (LMWC) was prepared by degradation with NaClO so that chitosan was able to dissolve in water. Chitosan to liquor ratio, NaClO content, temperature, and time were considered variables of NaClO degradation, and the Box-Behnken design was used to determine optimal conditions. There was good agreement between the experimental data and their predicted counterparts. The optimum conditions for chitosan degradation were estimated to be 1:67.91 of chitosan to liquor ratio, 22.03% of NaClO content, a temperature of 90.3 °C, and a time of 3.07 h. It was found that synthesis under these optimized conditions achieved the lowest molecular weight (10,937.4 Daltons). In addition, Fourier transform infrared spectroscopy, X-ray diffractograms, and thermogravimetric analysis showed that the structure of LMWC was similar to the original chitosan, while the crystallinity and thermal stability decreased after degradation.

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Section: Ftir Analysis Of Original Chitosan and Lmwcsupporting

confidence: 67%

Synthesis and Characterization of Low Molecular Weight Chitosan

Yuan¹,

Jiang²,

Xing³

et al. 2015

BioResources

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“…Characteristic absorptions of chitosan and chitosan oligosaccharides at 3410 cm À1 (m O-H and m N-H ), 2924 cm À1 (m C-H ), 1623, 1513 cm À1 (d N-H ), 1088 cm À1 (m C-N ), 651 cm À1 (d NH2 ), 1153 cm À1 (d C-O-C ) and 895 cm À1 (b-d C-H ) are easily observed. 18 Moreover, the peak at 895 cm À1 , proved that the cyclic pyranosyl rings were not destroyed by microwave irradiation, nor were the amino groups at 651 cm À1 .…”

Section: Ftir Analysismentioning

confidence: 96%

“…Shao et al 18 prepared medicinal oligoglucosamine by the oxidative degradation of chitosan with neutral hydrogen peroxide under microwave irradiation and obtained a water-soluble oligoglucosamine. However, the degradation reaction of chitosan was not sufficient by this heterogeneous reaction method, and the molecular weight of the products was not well-proportioned.…”

Section: Introductionmentioning

confidence: 99%

Salt-assisted acid hydrolysis of chitosan to oligomers under microwave irradiation

Xing

Liu

et al. 2005

Carbohydrate Research

108

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“…Due to its special physical, chemical and biological properties it has extensive applications in the food industry [12], agriculture [13], pharmacy, medicine [14,15] and waste water treatment [16]. Indeed, it is a biocompatible and biodegradable polymer [17] whose degradation pathway has been studied by various methods [18][19][20]. In view of the new applications of this environmental friendly polymer further studies shall be developed to determine its thermal stability as well as to allow a better understanding on the mechanistics and kinetics aspects involved in the thermal degradation of the polymer.…”

Section: Introductionmentioning

confidence: 99%