Development of an ultrasensitive magnetic biosensing platform using SERS and aptamer for the ratio detection of chlorpyrifos in tea - Chenxi Jin; Min Cao; Geqi Li; Jiaqi Wang; Chongyang Qin; Pu Wang; Fei Guo; Dejiang Ni; Zhi Yu; De Zhang; Pei Liang (Food Chemistry, 2026)