Back to Search
Start Over
Improved double emulsion technology for fabricating autofluorescent microcapsules as novel ultrasonic/fluorescent dual-modality contrast agents
- Source :
- Colloids and Surfaces B: Biointerfaces. 116:561-567
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- The aim of this study is to explore an improved double emulsion technology with in situ reaction of lysine (Lys) and glutaraldehyde (GA) for fabricating autofluorescent Lys-poly(lactic-co-glycolic acid)-GA (Lys-PLGA-GA) microcapsules as novel ultrasonic/fluorescent dual-modality contrast agents. Scanning electron microscope (SEM) and static light scattering (SLS) results show that 80% of the Lys-PLGA-GA microcapsules are larger than 1.0 mu m and 90% of them are smaller than 8.9 mu m. SEM and laser confocal scanning microscope (LCSM) data demonstrate that the structure of our Lys-PLGA-GA microcapsules is hollow. Compared with the FT-IR spectrum of PLGA microcapsules, a new peak at 1644 cm(-1) in that of Lys-PLGA-GA microcapsules confirms the formed Schiff base in Lys-PLGA-GA microcapsules. LCSM images and fluorescence spectra show that our Lys-PLGA-GA microcapsules exhibit bright and stable autofluorescence without conjugation to any fluorescent agent, which can be ascribed to the n-pi* transitions of the C=N bonds in the formed Schiff base. Our autofluorescent Lys-PLGA-GA microcapsules might have more wide applications than traditional fluorescent dyes because their excitation and emission spectra are both broad. The fluorescence intensity can also be tuned by the feeding amount of Lys and GA. The MTT assays reveal that the autofluorescent microcapsules are biocompatible. The results of fluorescent imaging in cells and in vitro ultrasonic imaging demonstrate the feasibility of our autofluorescent Lys-PLGA-GA microcapsules as ultrasonic/fluorescent dual-modality contrast agents. This novel ultrasonic/fluorescent dual-modality contrast agent might have potential for a variety of biological and medical applications. (C) 2014 Elsevier B.V. All rights reserved.
- Subjects :
- Materials science
Cell Survival
Surface Properties
Scanning electron microscope
Confocal
Analytical chemistry
Contrast Media
Biocompatible Materials
Capsules
macromolecular substances
Fluorescence
chemistry.chemical_compound
Colloid and Surface Chemistry
Polylactic Acid-Polyglycolic Acid Copolymer
Tumor Cells, Cultured
Humans
Ultrasonics
Static light scattering
Lactic Acid
Particle Size
Physical and Theoretical Chemistry
Lysine
technology, industry, and agriculture
Surfaces and Interfaces
General Medicine
Autofluorescence
PLGA
chemistry
Glutaral
MCF-7 Cells
Emulsions
Ultrasonic sensor
Glutaraldehyde
Polyglycolic Acid
Biotechnology
Nuclear chemistry
Subjects
Details
- ISSN :
- 09277765
- Volume :
- 116
- Database :
- OpenAIRE
- Journal :
- Colloids and Surfaces B: Biointerfaces
- Accession number :
- edsair.doi.dedup.....76ce827f208c5bb97c39913375e78cb6