Since 1986, the United States has regulated chitosan for agricultural use. International Journal of Biological Macromolecules, 87, 163—171. International Journal of Current Biotechnology, 1, 9—11. Structure of the chitin molecule, showing two of the units cemistry repeat to form long chains in β-1,4 linkage. Although you may have never heard of it, chitin is abundant in nature. Share or assign lessons and chapters by clicking the "Teacher" tab on the lesson or chapter chemisty you want to assign. Click on the "Custom Courses" tab, then click "Create course". Examples of Polymers Polymers may be divided into two categories. A future perspective in crop protection: chitosan and its oligosaccharides. Historical Parts In 1811, French chemist and pharmacist Henri Braconnot discovered the alkaline-insoluble fraction from mushrooms by chitin definition chemistry with dilute warm alkali. Advances in Experimental Medicine and Biology. Chitosan has a number of commercial and possible biomedical