ABSTRACT
In this study, a rapid fluorescent and colorimetric dual-mode detection strategy for Hg2+ in seafoods was developed based on the cyclic binding of the organic fluorescent dye rhodamine 6G hydrazide (R6GH) to Hg2+. The luminescence properties of the fluorescent R6GH probe in different systems were investigated in detail. Based on the UV and fluorescence spectra, it was determined that the R6GH has good fluorescence intensity in acetonitrile and good selective recognition of Hg2+. Under optimal conditions, the R6GH fluorescent probe showed a good linear response to Hg2+ (R2 = 0.9888) in the range of 0-5 µM with a low detection limit of 2.5 × 10-2 µM (S/N = 3). A paper-based sensing strategy based on fluorescence and colorimetric analysis was developed for the visualization and semiquantitative analysis of Hg2+ in seafoods. The LAB values of the paper-based sensor impregnated with the R6GH probe solution showed good linearity (R2 = 0.9875) with Hg2+ concentration in the range of 0-50 µM, which means that the sensing paper can be combined with smart devices to provide reliable and efficient Hg2+ detection.
ABSTRACT
Regulatory γδT cell (γδTreg) is a recently reported subset of γδT cells characterized by both expressions of TCRγδ and Foxp3, with potential immunosuppressive functions. However, the further studies of γδTreg are limited mainly due to its low quantities in vivo and the lack of methods to induce γδTreg largely in vitro. Here we show that rapamycin together with TGF-ß1, IL-2 and IL-15 can induce and expand γδTregs derived from human peripheral blood mononuclear cells efficiently in vitro. Thus-induced γδTregs express high levels of Foxp3 and CD25, and display significant immunosuppressive activities in vitro.
