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.

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。