Table 5. Light transmittance of OPP/gelatin bilayer films with different concentrations of mustard essential oil or oregano essential oil at 4°C

Wavelength (nm)		Mustard essential oil (%)					Oregano essential oil (%)
Wavelength (nm)		0	20	40	60	80	0	10	20	30	40
200		1.93±0.12^bF	1.57±0.21^cD	2.17±0.05^bE	2.63±0.12^aD	2.04±0.13^bE	3.63±0.31^bE	3.67±0.05^bC	3.40±0.08^bD	4.37±0.09^aD	4.23±0.05^aF
300		66.23±2.85^aD	36.43±3.53^bC	14.63±2.60^cD	12.73±2.42^cC	10.23±0.76^cD	66.23±2.85^aD	63.33±4.86^aB	50.07±4.13^bC	47.53±7.69^bcC	38.43±2.73^cE
400		86.53±0.54^aC	77.87±1.39^bB	68.00±1.96^cC	66.13±3.97^cdB	62.77±1.28^dC	86.53±0.54^aC	85.77±2.35^aA	75.40±2.05^bB	71.03±1.98^bB	66.60±0.86^cD
500		88.63±1.91^aBC	83.27±1.62^aA	74.97±3.24^bB	73.67±2.84^bA	73.20±4.12^bB	88.63±1.91^aBC	88.33±1.76^aA	81.30±1.24^bA	76.63±1.16^cAB	73.17±0.71^dC
600		89.30±2.33^aBC	83.67±1.48^bA	77.73±1.80^cAB	75.30±1.43^cA	74.50±2.35^cB	89.30±2.33^aBC	88.03±2.55^aA	82.31±0.94^bA	79.30±1.88^bcA	76.37±1.09^cBC
700		92.03±1.32^aAB	83.63±2.80^bA	79.47±1.32^bcAB	75.23±3.77^cA	76.97±2.15^cAB	92.03±1.32^aAB	91.27±0.17^aA	83.57±0.82^bA	80.53±1.35^cA	78.71±1.64^cAB
800		94.33±3.22^aA	84.97±2.27^bA	80.80±1.48^bA	80.67±5.07^bA	80.17±1.70^bA	94.33±3.22^aA	91.30±0.22^aA	84.13±1.02^bA	82.00±1.42^bA	80.07±1.87^bA
p-value	Wavelength	0.000					0.000
	Essential oil	0.000					0.000
	Wavelength ×Essential oil	0.000					0.000

For each essential oil, capital letters in each column represent significant differences (p<0.05).
For each essential oil, lowercase letters in each row represent significant differences (p<0.05).
OPP, oriented polypropylene.