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چکیده
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The essential oil obtained by steam-distillation from Ferulago angulata (FA) was stabilized by ionic-gelation technique within chitosan nanoparticles (CSNPs). The aim of this study was to investigate different properties of CSNPs loaded with FA essential oil (FAEO). GC–MS analysis detected the major components of FAEO as α-pinene (21.85 %), β-ocimene (19.37 %), bornyl acetate (10.50 %) and thymol (6.80 %). Due to presence of these components, FAEO showed stronger antibacterial activity against S. aureus and E. coli with MIC values of 0.45 and 2.12 mg/mL, respectively. Chitosan to FAEO ratio of 1: 1.25 exhibited a maximum encapsulation efficiency (60.20 %) and loading capacity (24.5 %) values. By increasing loading ratio from 1:0 to 1:1.25, mean particle size and polydispersity index were significantly (P < 0.05) increased from 175 to 350 nm and 0.184 to 0.32, respectively, while zeta potential was decreased from +43.5 to +19.2 mV, indicating the physical instability of CSNPs at higher FAEO loading concentrations. SEM observation proved successful formation of spherical CSNPs during the nanoencapsulation of EO. FTIR spectroscopy indicated successful physical entrapment of EO within CSNPs. Differential scanning calorimetry also proved the physical entrapment of FAEO into polymeric matrix of chitosan. XRD exhibited a broad peak at 2θ = 19◦ – 25◦ in loaded-CSNPs as indication of successful entrapment of FAEO within CSNPs. Thermogravimetric analysis showed that encapsulated essential oil was decomposed at higher temperature than its free from, indicating the success of encapsulation technique in stabilizing FAEO within CSNPs
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