Effects of lipid, PET/PE and PA/PE with high-pressure processing

Figures & data

Figure 1. Effects on acid value of Olive oil after (a) and (b) different pressure on PET/PE; (c) and (d) different pressure on PA/PE.

Table 1. The change of tensile strength after different pressure and holding time on PET/PE and PA/PE films.

Packaging material	HPP processing conditions		Time (days)
			10	20	30	40
	Pressure (MPa)	HPP holding time (min)	Tensile strength (MPa)
PET/PE	0.1	0	26.1^a±5.5	24.0^a±2.0	23.3^a±2.2	21.7^a±4.3
	300	5	33.2^b±2.0	31.7^b±3.2	30.2^b,c±5.5	29.2^b±2.9
	300	10	32.6^b,c±1.4	31.7^b±6.8	29.8^b±4.1	29.0^b±2.6
	400	5	34.6^c±2.3	35.0^c±2.9	32.9^c,d±4.7	30.2^b±5.3
	400	10	34.7^c±0.7	34.3^c±5.4	33.2^d±8.2	29.8^b±4.1
	500	5	39.7^d±7.3	37.6^d±6.3	36.7^e±5.3	34.9^c±7.9
	500	10	39.1^d±5.8	38.2^d±2.7	36.5^e±6.1	34.4^c±6.9
PA/PE	0.1	0	23.1^a±2.5	21.9^a±3.0	20.7^a±1.9	19.6^a±4.8
	300	5	28.1^b±2.9	26.2^b±1.6	25.8^b±2.8	23.6^b,c±2.9
	300	10	29.4^b±3.7	25.3^b±2.9	24.0^b±5.9	22.1^b±4.7
	400	5	31.9^c±1.5	27.7^c±4.3	25.0^b±4.0	23.8^b,c,d±6.5
	400	10	32.2^c±7.4	28.6^c±0.7	28.3^c±3.6	24.9^c,d,e±4.3
	500	5	34.6^d±4.4	33.4^d±7.2	29.8^c±7.5	26.1^e±5.4
	500	10	35.5^d±10.1	32.3^d±2.9	28.7^c±5.0	25.5^d,e±3.6

Mechanical properties with significant (p < 0.05) differences in the mean values; Different superscript letters demonstrate significant difference.

Table 2. Water vapor transmission rates for packaging materials before and after HPP processing.

Packaging material	HPP processing conditions		Time (days)
			10	20	30
	Pressure (MPa)	HPP holding time (min)	WVTR (g/m^2/day)
PET/PE	0.1	0	8.76^a±1.2	8.82^b±2.7	8.85^b±1.6
	300	5	8.26^b±3.9	8.32^a±1.2	8.37^a±2.0
	400	5	8.25^b±2.4	8.34^a±0.9	8.39^a±2.6
	400	10	8.16^b±5.1	8.27^a±2.4	8.34^a±2.9
	500	5	8.23^b±4.8	8.35^a±3.0	8.40^a±1.7
	500	10	8.24^b±1.9	8.33^a±2.2	8.40^a±4.3
PA/PE	0.1	0	4.49^a±4.0	4.54^a±4.4	4.58^a±2.6
	300	5	4.32^a,b±4.1	4.37^a,b±0.7	4.42^a±1.3
	400	5	4.31^a,b±1.9	4.36^a,b±3.1	4.43^a±0.9
	400	10	4.26^b±3.2	4.31^b±4.2	4.38^a±2.0
	500	5	4.25^b±1.6	4.33^b±1.1	4.40^a±2.9
	500	10	4.24^b±0.8	4.32^b±5.1	4.39^a±4.3

Water vapor transmission properties with significant (p < 0.05) differences in themean values; Different superscript letters demonstrate significant difference.

Figure 2. Effects of different processing conditions on acid value of Glycerol trioleate on PET/PE.

Figure 3. Effects of different processing conditions on acid value of Glycerol trioleate on PA/PE.

Figure 4. Effects of Glycerol trioleate acid value after (a) different holding time conditions on PET/PE; (b) different holding time conditions on PA/PE.

Figure 5. Effects of different holding time conditions on olive oil acid value on PA/PE.

Table 3. Tensile strength (MPa) of analyzed plastic with different food simulants.

Packaging material	Phase contact	Control	400 MPa, 5 min
	None	24.4^a±3.1	20.9^a±0.8
PET/PE	Olive oil	26.1^b±5.5	34.6^b±2.3

Different superscript letters demonstrate significant difference.

Table 4. Thermal analysis results for packaging films subjected to various pressure treatment.

Packaging material	Phase contact	Conditions	Tm (^oC)		Tm (^oC)
			PE	(J/g)	PET	(J/g)
PET/PE	Olive oil	0.1 MPa	121.74^a	18.34^a	252.84^a	4.354^a
	none	400 MPa,5 min	121.96^a	27.69^b	252.91^a	6.795^b
	Olive oil	400 MPa,5 min	122.25^a	31.21^c	253.60^a	8.623^c
	none	300 MPa,5 min	121.98^a	22.44^d	253.17^a	6.521^d
	Olive oil	300 MPa,5 min	121.74^a	42.17^e	253.24^a	9.269^e

Tm (melting point in ^oC), H (enthalpy of fusion in J/g); Different superscript letters demonstrate significant difference.

Table 5. Thermal analysis results for packaging films subjected to various pressure treatment.

			Tm (^oC)		Tm (^oC)
Packaging material	Phase contact	Conditions	PE	(J/g)	PA	(J/g)
PA/PE	Olive oil	0.1 MPa	121.99^a	25.40^a	221.42^a	10.91^a
	none	400 MPa,5 min	121.99^a	17.20^c	220.92^a	7.794^b
	Olive oil	400 MPa,5 min	121.90^a	19.00^b,c	221.12^a	8.632^b
	none	300 MPa,5 min	122.05^a	19.43^b	221.03^a	8.035^b
	Olive oil	300 MPa,5 min	121.81^a	18.31^b,c	220.69^a	5.935^c

Tm (melting point in ^oC), H (enthalpy of fusion in J/g); Different superscript letters demonstrate significant difference.