By Simona Cavalu et al.
Due to the limitation of chitosan in drug delivery systems, because of its hydrophilicity and solubility, chemical modification was performed in our study by combining with a second natural polymer, Arabic gum, in order to
improve the stability of nanoparticles. Copyright Simona Cavalu et al.
Morphological and structural characterization, using AFM, operating in tapping mode, along with the surface profile. Although the lateral dimensions are influenced by the shape of the probe, the height measurements can provide the height of nanoparticles with a high degree of accuracy and precision. However, larger particles are formed due to the aggregation during storage time. Copyright Simona Cavalu et al.
Structural characterization of polymeric powder
nanoparticles entrapping propolis was performed by ATR
FTIR spectroscopy, and compared with recorded spectrum of raw propolis, chitosan powder and Arabic gum as reference. In the same time, the
marker bands of propolis are well preserved in the polymeric mixture, indicating that the bioactive compounds are stable upon the encapsulation procedure. Copyright Simona Cavalu et al.
In this study we succeeded to prepare and characterize natural polymeric nanoparticles based on chitosan/Arabic gum, entrapping propolis extract. The physico-chemical properties of nanoparticles were assessed by UV-visible and FTIR spectroscopy, along with Dynamic Light Scattering, revealing that particle size obtained from highly dispersed mixture was in the range of 50-400 nm, with large Gaussian distribution, the maximum percentage of size distribution being at around 120 nm. In the same time,
an efficient encapsulation procedure was described using glutaraldehyde as cross-linking agent. The morpholological features of nanoparticles were emphasized by AFM microscopy, demonstrating a good correlation between
the results obtained by DLS technique. The FTIR analysis demonstrated that the marker bands of propolis are well preserved in the polymeric mixture, indicating that the bioactive compounds are stable upon the encapsulation
procedure. In our formulation, we consider that a balanced crosslinking toward electrostatic interaction was established. Propolis release from polymeric matrix was monitored in both simulated gastric acid and simulated intestinal fluids, concluding that our proposed formulation
is suitable for controlled release and pharmaceutical applications. Our results may provide a novel drug design, with improved bioavailability, stability and nutritional value of propolis bioactive compounds during processing and storage, with possible applications in food and nutraceutical industries. Copyright Simona Cavalu et al.
Full text at https://revistadechimie.ro/Articles.asp?ID=6836