Polyamide resin applied five factors in the field of separation and extraction

Polyamide resin applied five factors in the field of separation and extraction

Are: ( 1 ) the molecular weight flavonoids Shumu hydrogen bond forming groups related to the number , the greater the number of hydrogen bonds to form a group of the stronger adsorbed ;

( 2 ) formed on the position of hydrogen bonding groups , such as the location is easy to form intramolecular hydrogen bonds , the absorption capacity decreases.

(3 ) aromatic molecule higher degree , the more the conjugated double bond, then the stronger adsorption .

( 4 ) different types of flavonoids , are adsorbed strength of the order: flavonols > flavones > Dihydroflavonol > isoflavones.

( 5 ) and the solvent medium related. The ability to form hydrogen bonds in the water a strong , strong absorption in an organic solvent is less strong in an acidic solvent , alkaline solvent, the weakest , so the ability of various solvents in the polyamide column eluted from weak to strong the order is: water < methanol or ethanol ( concentration from low to high ) < acetone < dilute aqueous sodium hydroxide or ammonia < carboxamide < dimethylformamide < urea solution. Baiyun E series of studies [ 2] have been isolated total flavonoids Trollius polyamide , polyamide adsorption amount Comparison bell understanding of nasturtium and adsorption capacity of total flavonoids . The results showed that with 60 to 80 mesh polyamide solution for Lotus total flavonoid absorption and adsorption better.

    [ 3 ] using the principle of polyamide adsorption of anthraquinone through hydrogen bonding , adsorption and separation as polyamide resin , polyamide first examined the adsorption capacity of Polygonum cuspidatum anthraquinone , adsorption kinetics and adsorption-desorption isotherms nature , from Jing is superior than the activated carbon adsorption absorption and desorption of silica gel as anthraquinone capacity and speed comparisons prove polyamide. Polyamide anthraquinone adsorption rate of 87.8% , the adsorption rate controlling step for the film diffusion control , ethanol eluent with more than 85% washout rate . Is a monolayer adsorption -based multilayer adsorption thermodynamics of adsorption behavior from anthraquinone on polyamide and came adsorption principle : monolayer adsorption contains chemical and physical adsorption , multilayer adsorption is mainly physical adsorption .