Characterization Of Osmanthus Fragrance Loaded Chitosan-Sodium Tripolyphosphate (CS-TPP) Nanoparticles

Osmanthus fragrance loaded nanoparticles (OF-NPs) was prepared via complex coacervation successfully with natural polymers of chitosan and sodium tripolyphosphate (CS-TPP). And then, the prepared nanoparticles were applied in the cotton fabrics directly. OF-NPs were characterized with dynamic light scattering (DLS), transmission electron microscopy (TEM), fourier transformation infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The sustained property of the cotton fabrics impregnated with OF-NPs was investigated with scanning electron microscopy (SEM), Electronic nose (E-nose) and gas chromatography-mass spectrometry (GC-MS). Non-encapsulated OF was also prepared and treated on fabrics for comparison.Through some pre-tests and a series of single factor experiments, and then further optimized by orthogonal experimental process, the optimal conditions of the preparation of the nanoparticles were confirmed:wall material content was 0.18%(of which the CS:TPP is 5:1); OF content was 0.4%; the content of emulsifier used AEO7 and EL40 was 0.32%,and AEO7:EL40 was 1:1; acetic acid content was 2.6mg/ml; the volume ratio of CS and TPP was 2:3; homogenization time was 10min; stirring speed was 500r/min; titration speed was 0.05ml/3s;the reaction time was 2 h.TEM and DLS displayed that nanoparticles were spherical and the average size was found to have 130 nm with a narrow size distribution. FTIR confirmed the nanoparticles formation. TGA demonstrated OF-NPs had an enhanced thermo-stability compared with OF and the loading content of OF was above 12%.SEM revealed the presence of OF-NPs formed into the cotton fibres. E-nose and GC-MS illustrated that the aroma released from the cotton fabrics finished by OF-NPs after 20 washing cycle was kept invariable in contrast to that by OF. Based on the results, OF-NPs can be applied to the durable fragrant finishing for fabrics.