为实现南极磷虾资源的综合利用，制备了4种酸性低共熔溶剂进行虾青素的提取，根据提取条件进行萃取优化，评估了溶剂的循环利用、提取液的稳定性和抗氧化能力，最后利用提取残渣作为生物吸附剂。研究表明，低共熔溶剂酸性增强可显著增加虾青素提取效率，低共熔溶剂DL-薄荷醇：乙酸（MAA）在最佳条件下［提取温度25 ℃，提取时间1 h，固液比1:10 (g/mL)]萃取得到的虾青素含量可达222.96 mg/kg，具有良好的溶剂循环利用效果和抗氧化能力，DL-薄荷醇: 辛酸（MOA）提取液在4 ℃下表现出良好的色泽和浓度的保持能力。通过拟合也证实了贮藏期间各提取液的色差与虾青素浓度的变化趋势之间具有良好的相关性（平均R2>0.9）。最后，提取残渣粗糙多孔，对阴离子型染料刚果红的吸附率达到70%。该研究为选择和设计提取天然虾青素的溶剂和南极磷虾的高效利用提供了技术支持。

To comprehensively use Antarctic krill resources, four acidic deep eutectic solvents were prepared for astaxanthin extraction. The optimization of the extraction considered the recycling of solvents and stability and antioxidant capacity of the extraction solution. Moreover, the extraction residue was used as a biosorbent. The enhancement of the acidity of deep eutectic solvents significantly increased the extraction efficiency of astaxanthin. The content of astaxanthin obtained by the deep eutectic solvent DL-menthol: acetic acid (MAA) under optimized conditions [extraction temperature: 25℃; extraction time: 1 h; solid-liquid ratio 1:10 (g/mL)] was 222.96 mg/kg, with good solvent recycling and antioxidant ability. The DL-menthol: caprylic acid (MOA) extract showed favorable color and concentration stability at 4 ℃. A strong positive correlation (average R2>0.9) was identified between the chromatism values observed in the deep eutectic solvent extracts and the corresponding astaxanthin concentrations during storage. The extraction residue was rough and porous, and the adsorption rate of the anionic dye Congo red reached 70%. This study provides valuable technical details for the selection and design of solvents for the extraction of natural astaxanthin and the efficient utilization of Antarctic krill.

国家自然科学基金面上项目（22078070）；广东省基础与应用基础研究面上项目（2019A1515010640）；广东省教育厅重点项目（2022ZDZX4025）；国家级创新训练项目（202310573001）