Preparation of Chitosan Nanospheres by Miniemulsion Crosslinking Method

Objective To obtain immobilized nanomaterials with good performance, the preparation condition of chitosan nanospheres by miniemulsion crosslinking method was optimized. Methods The chitosan nanospheres were synthesized by miniemulsion crosslinking method with Span80 and Tween80 as the emulsifier, glutaraldehyde as the crosslinker, n-hexane and paraffin liquid as oil phase,chitosan acetic acid solution as aqueous phase. The particle size was measured by Zetasizer nanoanalyzer. Results The results of the univariate tests show that the optimal preparation condition of chitosan nanospheres can be obtained when water/oil volume ratio is 3:2. The size distribution of chitosan nanospheres is 18.17nm to 190.1nm. Conclusion The chitosan nanospheres by miniemulsion crosslinking method are suitable materials as enzymes and proteins immobilized carrier.

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Electrospinning and Characterization of Novel Opuntia ficus-indica Mucilage Biomembrane

MRS Proceedings ◽

10.1557/opl.2012.1614 ◽

2012 ◽

Vol 1480 ◽

Author(s):

Sylvia W. Thomas ◽

Norma A. Alcantar ◽

Yanay Pais

Keyword(s):

Acetic Acid ◽

Acid Solution ◽

Acetic Acid Solution ◽

Volume Ratio ◽

Average Diameter ◽

Low Molecular Weight ◽

Opuntia Ficus Indica ◽

Force Microscopy ◽

Atomic Force

ABSTRACTOpuntia ficus-indica (Ofi) cactus non-gelling (NE) mucilage nanofibers were electrospun with acetic acid solution and polyvinyl alcohol (PVA) as a polymer. The best fiber coverage was achieved with an aqueous 50% acetic acid solution and 9% low molecular weight PVA at a 70:30 PVA:Mucilage volume ratio. Other volume ratios (30:70 and 50:50) produced beads and other deformities. Fibers were formed with an average diameter of 180nm as measured by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Favorable electrospinning conditions were used to fabricate a 1 cm x 1 cm Ofi nanofiber biomembrane. Heat flow (W/g) versus temperature peaks ranged from 214 – 222°C, which is comparable to endothermic peak ranges observed for crystalline PVA. This could possibly further indicate some form of crystallinity within the Ofi nanofiber membrane. The electrospun process used precursors that were biodegradable, non-toxic, and sustainable to optimize the mucilage nanofiber formation, which will help enhance the potential performance of the Ofi nanofiber biomembrane in filtration and sensory systems.

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Some Approaches to Viscometric Study of Chitosan in Acetic Acid Solution

Chemistry & Chemical Technology ◽

10.23939/chcht10.02.135 ◽

2016 ◽

Vol 10 (2) ◽

pp. 135-139 ◽

Cited By ~ 3

Author(s):

Valentina Chernova ◽

◽

Angela Shurshina ◽

Elena Kulish ◽

Gennady Zaikov ◽

...

Keyword(s):

Acetic Acid ◽

Acid Solution ◽

Intrinsic Viscosity ◽

Acetic Acid Solution ◽

Conformational State ◽

Macromolecular Coil ◽

Degree Of Swelling ◽

Current Value ◽

Viscometric Study

Some ways of estimating the values of the intrinsic viscosity of chitosan were analyzed. It was shown that the method of Irzhak and Baranov for estimating the current value of the intrinsic viscosity allows to adequately estimates the conformational state of the macromolecular coil and its degree of swelling.

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