Table 2.
Color parameters and transparency characteristics of the electrospun biopapers of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) containing oregano essential oil (OEO) and zinc oxide nanoparticles (ZnONPs).
| Biopaper | L* | a* | b* | ΔE* | T | O |
|---|---|---|---|---|---|---|
| PHBV | 89.82 ± 0.06 a | 0.87 ± 0.07 a | −0.38 ± 0.02 a | --- | 3.13 ± 0.02 a | 0.016 ± 0.06 a |
| PHBV + 10 wt% OEO | 85.35 ± 0.07 b | 1.13 ± 0.05 b | 6.67 ± 0.03 b | 8.36 ± 0.08 a | 3.55 ± 0.03 a | 0.019 ± 0.08 a |
| PHBV + 3 wt% ZnONPs | 88.11 ± 0.06 a | 0.56 ± 0.04 a | −0.96 ± 0.05 c | 1.83 ± 0.05 b | 9.60 ± 0.06 b | 0.052 ± 0.05 b |
| PHBV +2.5 wt% OEO +2.25 wt% ZnONPs | 86.80 ± 0.03 c | −0.92 ± 0.03 c | 4.32 ± 0.02 d | 5.87 ± 0.03 c | 8.08 ± 0.04 c | 0.041 ± 0.05 c |
| PHBV + 5 wt% OEO + 1.5 wt% ZnONPs | 84.10 ± 0.07 d | −0.65 ± 0.06 d | 3.14 ± 0.09 e | 6.88 ± 0.09 d | 7.17 ± 0.05 d | 0.037 ± 0.05 c |
| PHBV + 7.5 wt% OEO + 0.75 wt% ZnONPs | 84.96 ± 0.06 bd | −0.55 ± 0.08 e | 5.35 ± 0.06 f | 7.64 ± 0.08 e | 5.03 ± 0.06 e | 0.027 ± 0.05 d |
L*: Luminosity (+L luminous, −L dark), a*: red/green coordinates (+a red, −a green), b*: yellow/blue coordinates (+b yellow, −b blue), ΔE*: color difference, T: transparency, and O: Opacity. a–f Different letters in the same column indicate a significant difference (p < 0.05).