Moreover, although oregano oil has been reported to be a strong and highly active substance in polymer films, precious little information is available on combining chitosan and marjoram oil, which stems from the same Origanum genus.
Samples were designed as CH for chitosan without any essential oil, CH-O 0.5 to 5 for chitosan film with EE (containing oregano oil) in the concentrations 0.5 to 5%wt., and CH-M 0.5 to 5 for chitosan with EE (containing marjoram oil) in the concentrations 0.5 to 5% wt.
GC analysis proved the presence of the following: the main constituents in the oregano oil were carvacrol (58%), p-cymene (9.9%), myrcene (3%), and thymol (1.8%); analysis of the marjoram oil revealed the foremost contents to be terpinen-4-ol (23.5%), [alpha]-terpinene (9.6%), and sabinene (8.5%) (outcomes from said GC analysis are not included in Table 1).
During analysis of the marjoram oil, an alcohol terpinen-4-ol (Figure 1(c)) was found to be the primary constituent (31%).