Table 4. Concentration of heterocyclic amines in BBQ pork belly marinated with natural materials (ng/g)

HCAs	Pork belly	Pork belly marinated in natural materials
HCAs	Pork belly	Natural spice	Blackcurrant	Gochujang
IQx	2.66 ± 1.91^b	nq	nq	12.74 ± 1.98^a
IQ	2.74 ± 1.45	nd	nd	nd
MeIQx	2.50 ± 0.11	3.53 ± 1.29	nd	2.83 ± 1.25
7,8-DiMeIQx	10.55 ± 0.79	10.19 ± 3.92	12.03 ± 4.45	12.56 ± 7.18
4,8-DiMeIQx	7.51 ± 2.83	7.76 ± 3.62	nd	nq
PhIP	nd	nd	nd	nd
Total HCAs	25.96	21.45	12.03	28.13

Data presented as mean ± standard deviation (n=3).
Means with different superscript letters within the same row are significantly different from the control at p < 0.05.
IQx, 2-amino-3-methylimidazo[4,5-f]quinoxaline; nq, not quantifiable; IQ, 2-amino-3-methyl-3H-imidazo[4,5-f]quinolone; nd, not detected; MeIQx, 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline; 7,8-DiMeIQx, 2-amino-3,7,8-trimethyle-3H-imidazo[4,5-f]quinoxaline; 4,8-DiMeIQx, 2-amino-3,4,8-trimethyl-3H-imidazo[4,5-f]quinoxaline; PhIP, 2-amino-1-methyl-6-phenylimidazo[4,5-b] pyridine; HCA, heterocyclic amine.