title: Low-toxic Mn-doped ZnSe@ZnS quantum dots conjugated with nano-hydroxyapatite for cell imaging.
abstract: Fluorescent bio-imaging has received significant attention in a myriad of research disciplines, and QDs are playing an increasingly important role in these areas. Doped QDs, an important alternative to conventional heavy metal-containing QDs are employed for biomedical applications. However, since QDs are exogenous substances to the biological environment, the biocompatibility of QDs is expected to be challenging in some cases. Herein, nano fluorine-doped hydroxyapatite (FAp, a well-known biocompatible material) was introduced to endow biocompatibility to Cd-free Mn-doped ZnSe@ZnS QDs. Thus, a nano-FAp-QD conjugate was developed and the biocompatibility, as well as potential cell imaging application, was investigated. To construct the proposed conjugate, Cd-free highly luminescent Mn-doped ZnSe@ZnS QDs and monodispersed nano-FAp were first prepared in high-temperature organic media. For facilitating the conjugation, hydrophobic nano-FAp was made water soluble via o-phosphoethanolamine (PEA) coating, which further provides conjugating sites for QDs to anchor. Cytotoxicity studies indicated the developed conjugate indeed possesses good compatibility and low toxicity to cells. The nano-FAp-QDs conjugate was successfully employed for cancer cell staining for at least 24 h, demonstrating the potential usefulness of this material in future biomedical research.
authors.affiliation: Key Lab of Green Chemistry and Technology of MOE in College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Ronghui
authors.initials: R
authors.lastname: Zhou
authors.forename: Mei
authors.initials: M
authors.lastname: Li
authors.forename: Shanling
authors.initials: S
authors.lastname: Wang
authors.forename: Peng
authors.initials: P
authors.lastname: Wu
authors.forename: Lan
authors.initials: L
authors.lastname: Wu
authors.forename: Xiandeng
authors.initials: X
authors.lastname: Hou
mesh_terms: D017886:Durapatite / Q000737:chemistry / Q000494:pharmacology; D006367:HeLa Cells; D056945:Hep G2 Cells; D006801:Humans; D008345:Manganese / Q000737:chemistry / Q000494:pharmacology; D008856:Microscopy, Fluorescence / Q000379:methods; D045663:Quantum Dots / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry / Q000494:pharmacology; D013440:Sulfides / Q000737:chemistry / Q000494:pharmacology; D017967:Zinc Compounds / Q000737:chemistry / Q000494:pharmacology
chemical_list: D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; D008345:Manganese; D017886:Durapatite; C031238:zinc sulfide; C044696:zinc selenide