This study synthesized two metal-organic frameworks (MOFs)—ZIF-8 and amino-functionalized ZIF-8-NH2—via a solvothermal method.These MOFs were applied to enrich flavonoids from Rhodiola rosea,investigating their enrichment efficiency for total flavonoids,adsorption patterns,and the influence of amino modification on adsorption behavior to determine optimal enrichment conditions.Results indicate that under optimal adsorption conditions,the adsorption capacity of ZIF-8 with introduced —NH2 reached 378.09 mg/g,representing an increase of 68.65 mg/g compared to the unmodified form,with an adsorption rate as high as 94.52%.The adsorption of total flavonoids by both ZIF-8 and ZIF-8-NH2 followed pseudo-first-order kinetics,with average adsorption data conforming to the Langmuir adsorption isotherm model.Using PBS solution (pH=7) as the desorption solvent,the desorption capacity of ZIF-8 increased from 192.33 mg/g to 240.67 mg/g after introducing —NH2.Following enrichment by ZIF-8 and ZIF-8-NH2,the purity of total flavonoids increased from 7.5% to 69.05% and 82.05%,respectively,indicating that amino functionalization enhanced the average purification rate of total flavonoids by 13%.Therefore,compared to ZIF-8,amino-functionalized ZIF-8-NH2 demonstrates greater potential for application in the adsorption and purification of total flavonoids.
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