@article{tang_qian_2007,  title={Use of chitosan gel for the purification of protein},  volume={50},  ISSN={1516-8913},  url={https://doi.org/10.1590/S1516-89132007000200015},  DOI={10.1590/S1516-89132007000200015},  number={2},  journal={Brazilian Archives of Biology and Technology},  publisher={Instituto de Tecnologia do Paraná - Tecpar},  author={Tang, ZhenXing and Qian, JunQing},  year={2007},  month={Mar},  pages={299–309} }