Ammonium nitrate regulated the color characteristic changes of pigments in Monascus purpureus M9

AMB Express

Table 1 The color characteristics of MPs with AN treatment and the control samples

Group	Fermentation time (days)	CIELAB color system					Visual color^a
Group	Fermentation time (days)	L*	a*	b*	C_ab^b	H_ab^c	Visual color^a
Control	3	32.67	60.70	50.94	79.24	40.00	Orangish red
	4	19.11	50.86	32.94	60.60	32.93	Orangish red
	5	5.53	4.66	3.96	6.11	40.35	Orangish red
	6	5.96	4.51	2.40	5.11	28.08	Deep red
	7	5.69	4.92	2.33	5.44	25.37	Deep red
NH₄NO₃	3	88.79	4.75	27.70	28.10	80.26	Light orange
	4	54.61	47.25	66.31	81.42	54.46	Middle orange
	5	42.36	57.16	70.24	90.56	50.86	Middle orange
	6	44.72	57.71	69.34	90.21	50.23	Middle orange
	7	36.51	61.71	61.41	87.06	44.86	Orangish red