Table 4. Changes in pH, total volatile basic nitrogen (TVB-N), total viable count (TVC) of heat-treated (HT) and non-heat-treated (NHT) PVA/PAA/NR@TOCNF colorimetric indicator films (CIFs) during storage with pork at room temperature (25±2°C)

Sample		Storage period (days)	Analysis
			pH	TVB-N (mg/100 g)	TVC (CFU/g)
WHT-PVA/PAA/NR@TOCNF		0	5.71±0.291)a2)	10.61±3.54a	ND3)
		2	6.09±0.10b	16.80±0.88b	1.4×106a
		4	6.21±0.14b	36.23±0.04c	4.0×106b
		6	6.68±0.13c	84.84±0.00d	5.9×106c
HT-PVA/PAA/NR@TOCNF		0	5.71±0.29a	10.61±3.54a	ND
		2	6.04±0.07b	17.68±0.05a	1.4×106a
		4	6.28±0.09b	36.23±0.04b	3.5×106b
		6	6.68±0.10c	74.24±0.15c	4.7×106c

All values are mean±SD (n=3).
Values with different superscript letters (^a-d) in the same column are significantly different at p<0.05 by Duncan’s multiple range test.
Not detected.