Table 1.
Aroma compounds identified in clove essential oil and relative %.
Table 2.
Aroma compounds identified in spearmint essential oil and relative %.
Fig 1.
Major compounds of clove EO (A) and spearmint EO (B) with wave number regions for the CLS univariate and multivariate methods. Unloaded matrix represented with a dashed line.
Table 3.
Main IR absorption bands used as reference for the elaboration of the ATR-FTIR method.
Fig 2.
Evolution of the normalization spectral band (2900–2950 cm-1).
Solid line represents the matrix after the elaboration process (n = 15) and the dotted line the matrix after three months (n = 15).
Fig 3.
Results of the calibration and cross-validation CLS quantification method and GC-FID reference method.
Clove EO (A) and spearmint EO (B). ATR-FTIR calibration values (●), ATR-FTIR validation values (○), and GC-FID quantification values (Δ).
Table 4.
Statistical data of ATR-FTIR CLS model for encapsulated clove and spearmint EOs.
Fig 4.
Clove EO release determined by ATR-FTIR (●) and GC-FID methods (○ = all components quantified, ♦ = eugenol, eugenol acetate, and methyl 2-hydroxybenzoate quantified).
Fig 5.
Correlation of release through time of clove EO by the equation of Avrami.
ATR-FTIR quantification method values (●; dashed point line), GC-FID all components quantified (○; straight line), GC-FID eugenol, eugenol acetate, and methyl 2-hydroxybenzoate quantified (▲; dashed line).
Table 5.
Statistical data of clove essential oil release experiment by ATR-FTIR and GC-FID method.