Microwave mediated rapid synthesis of chitosan

Area of Science:

• Biochemistry
• Materials Science

Background:

• Chitin, a natural polymer, is a precursor to chitosan.
• Conventional chitosan synthesis methods are often time-consuming and energy-intensive.

Purpose of the Study:

• To develop a rapid and efficient method for chitosan synthesis.
• To investigate the effect of microwave irradiation on the deacetylation of chitin.

Main Methods:

• Chitin deacetylation using sodium hydroxide (NaOH) solution under microwave irradiation.
• Characterization of synthesized chitosan using Ninhydrin test, Fourier transform-infrared spectroscopy (FTIR), and X-ray diffraction (XRD).

Main Results:

• Microwave irradiation significantly accelerated the chitosan synthesis process.
• The degree of deacetylation increased with longer irradiation times.
• A high degree of deacetylation (85.3%) was achieved in just 5.5 minutes using 45% NaOH and 900-watt microwave power.

Conclusions:

• Microwave-assisted synthesis provides a fast, clean, and efficient route to produce chitosan.
• This method is suitable for synthesizing low molecular weight chitosan.
• The optimized conditions offer a practical alternative to conventional synthesis techniques.