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      • KCI등재

        Purification of Chinese herbal extract with chitosan hydrochloride: Flocculation of single impurity and flocculation mechanism

        Xiaojiao An,Yong Kang,Li Qin,Yajing Tian,Guishui Li 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6

        Chitosan hydrochloride (CHC) was used for flocculation of impurities (tannin and protein) in Ma-xinggan- shi solution (MSS), which is a Chinese herbal medicine solution (CHMS). To study the flocculation mechanism, simulated solutions of pure tannin and pure protein in water flocculated by CHC were investigated. For MSS flocculation by CHC, flocculation performance was assessed in terms of suspended turbidity, impurities removal rate as well as active components retention rate. CHC showed high capability of maintaining a low turbidity over a wide range of the polymer dosage. The optimum dosage of CHC was 0.6 g/L in base of different solution turbidity, and it also demonstrated the retention rate of total soluble polysaccharide (TSP) and ephedrine reached 78.4% and 92%, respectively.

      • KCI등재

        Flocculation of gelatinized starch: Flocculation performance and floc characterization

        Xiaojiao An,Yong Kang,Guishui Li 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.7

        The removal of single macromolecules impurity is the basis study for the promotion of flocculation technology application in the Chinese herbal medicine solution purification. We applied the flocculation process to remove gelatinized starch in solution. Three types of cationic polyacrylamide (CPAM) with different charge density were used for flocculation of gelatinized starch solution. The flocculation performance was evaluated in terms of the amylose removal ratio (AMRR), the amylopectin removal ratio (APRR), total starch removal ratio (TSRR) and supernatant turbidity (ST). The flocs were characterized by sedimentation performance, Fourier transform infrared (FTIR), scanning electron microscope (SEM) and X-ray photoelectric spectroscopy (XPS) method. The experimental results show that the flocculant CN15 has the best performance for gelatinized starch flocculation among three flocculants. According to the characterization analysis, the flocs exhibited an obvious network structure, and it is concluded that hydrogen bonding between N-H in CPAM and C-O in the starch and bridging flocculation played the essential roles in flocculation of the gelatinized starch.

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