Table 2. Effect of different vacuum packaging films on pH & color of beef during storage at 2±1°C

Parameter	Storage period (wk)
Parameter	0	2	3	5	7	8	9	10	12
pH
PVDC	5.46±0.03^a	5.46±0.03^a	5.46±0.02^a	5.45±0.01^a	5.33±0.01^b	5.12±0.01^d	5.25±0.02^c	5.08±0.03^d	5.00±0.06^e
EVOH	5.46±0.03^a	5.42±0.00^b	5.40±0.02^b	5.31±0.02^c	5.26±0.01^d	5.22±0.02^e	5.20±0.04^e	5.09±0.02^f	4.91±0.01^g
p-value	-	0.059	0.005**	0.000***	0.001**	0.000**	0.136	0.382	0.048*
CIE L*
PVDC	38.91±2.31^a	30.12±0.38^e	34.08±1.68^d	37.00±0.87^ab	36.46±0.24^cd	35.67±0.20^bcd	37.44±0.36^ab	38.66±0.56^a	34.69±0.34^cd
EVOH	39.03±0.80^a	31.45±1.53^cd	32.47±2.03^bcd	32.94±0.89^bcd	33.33±0.44^bc	33.67±0.63^c	30.79±0.61^d	32.34±0.41^bcd	26.96±1.61^e
p-value	0.933	0.217	0.350	0.005**	0.000***	0.008**	0.000***	0.000***	0.001**
CIE a*
PVDC	16.44±3.27^c	17.92±0.39^c	20.70±0.48^b	22.18±0.16^ab	22.91±0.31^a	20.81±0.39^ab	21.90±0.37^ab	20.37±0.57^b	21.59±0.34^ab
EVOH	17.34±1.57^bc	18.23±0.28^b	16.99±0.80^cd	18.48±0.21^ab	15.88±0.10^d	18.29±0.42^b	16.58±0.38^cd	19.56±0.16^a	10.30±0.47^e
p-value	0.689	0.325	0.002**	0.000***	0.000***	0.001**	0.000***	0.072	0.000***
CIE b*
PVDC	7.92±2.19^bc	7.25±0.17^c	9.35±0.70^a	10.15±0.33^a	10.01±0.16^a	9.16±0.24^ab	10.01±0.13^a	9.80±0.06^a	9.51±0.05^a
EVOH	8.75±0.52^a	7.88±0.59^b	7.79±0.43^bc	8.39±0.07^ab	7.89±0.09^b	8.52±0.04^a	7.24±0.08^c	8.41±0.17^ab	5.13±0.43^d
p-value	0.555	0.154	0.030*	0.001**	0.000***	0.013*	0.000***	0.000***	0.000***

All values are means±SD of 3 replicates.
In the same row are significantly different (p<0.05), respectively.
p<0.05,
p<0.01,
p<0.001.
PVDC, polyvinylidene chloride; EVOH, ethylene vinyl alcohol.