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The states of water in tryptophan grafted hydroxypropyl methylcellulose hydrogels and their effect on the adsorption of methylene blue and rhodamine B.
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2020-07-25 , DOI: 10.1016/j.carbpol.2020.116765
Paulo V O Toledo 1 , Oigres D Bernardinelli 2 , Edvaldo Sabadini 2 , Denise F S Petri 1
Affiliation  

Tryptophan (Trp) decorated hydroxypropyl methylcellulose (HPMC) cryogels were prepared by a one-step reaction with citric acid. The increase of Trp content in the 3D network from 0 to 2.18 wt% increased the apparent density from 0.0267 g.cm−3 to 0.0381 g.cm−3 and the compression modulus from 94 kPa to 201 kPa, due to hydrophobic interactions between Trp molecules. The increase of Trp content in HPMC-Trp hydrogels increased the amount of non-freezing water, estimated from differential scanning calorimetry, and the amount of freezing water, which was determined by time-domain nuclear magnetic resonance. The adsorption capacity of methylene blue (MB) and rhodamine B (RB) on HPMC-Trp hydrogels increased with Trp content and the amount of freezing water. HPMC-Trp hydrogels could be recycled 6 times keeping the original adsorptive capacity. The diffusional constants of MB and RB tended to increase with Trp content. RB adsorbed on HPMC-Trp hydrogels presented a bathochromic shift of fluorescence.



中文翻译:

色氨酸接枝的羟丙基甲基纤维素水凝胶中水的状态及其对亚甲基蓝和若丹明B吸附的影响

通过与柠檬酸的一步反应制备色氨酸(Trp)装饰的羟丙基甲基纤维素(HPMC)冷冻凝胶。3D网络中Trp含量从0增至2.18 wt%,表观密度从0.0267 g.cm -3增至0.0381 g.cm -3由于Trp分子之间的疏水作用,其压缩模量从94 kPa到201 kPa。HPMC-Trp水凝胶中Trp含量的增加增加了非冷冻水的量(由差示扫描量热法估算),以及冷冻水的量(由时域核磁共振确定)。亚甲基蓝(MB)和若丹明B(RB)在HPMC-Trp水凝胶上的吸附能力随Trp含量和冷冻水量的增加而增加。HPMC-Trp水凝胶可回收利用6次,保持原始吸附能力。MB和RB的扩散常数倾向于随着Trp含量的增加而增加。吸附在HPMC-Trp水凝胶上的RB呈现出荧光的红移。

更新日期:2020-07-29
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