Physical characteristics of nanoemulsion from chitosan/nutmeg seed oil and evaluation of its coating against microbial growth on strawberry

Abstract

The objectives of this research were to characterize nanoemulsion from chitosan/nutmeg seed oil and to evaluate its coating on fresh strawberry which stored at 10°C for 5 days. The ultraturrax and high-pressure homogenizer were used to prepare 1.34±0.25 - 5.79±1.61 nm of nanoemulsion size which confirmed by particle size analyzer. The morphology observed by SEM that exhibited the oil globules were covered by chitosan. They were aggregated and rough droplets. Interactions among the materials were observed using FTIR which led to the presence of a new peak at 1736 cm-1. The coated strawberry by high-pressure homogenizer-emulsion showed the best result suppressing microbial (2.41±0.01) and mould-yeast (2.78±0.10) growth at the end of storage compared to control which were 3.37±0.02 and 3.69±0.14 for microbial and mould-yeast count respectively.