Effect of pH and concentration on the chemical stability and reaction kinetics of thiamine mononitrate and thiamine chloride hydrochloride in solution

Table 2 Calculated activation energies as a function of temperature

pH	Vitamin salt form	Acid	Concentration (mg/mL)	E_a (kcal/mol)	E_a (kJ/mol)
3	TMN	HNO₃	1	27.2 ± 0.3^a	114 ± 1^a
		HNO₃	20	25 ± 1^ab	103 ± 5^ab
		HCl	1	26.9 ± 0.3^a	113 ± 1^a
		HCl	20	24.8 ± 0.5^ab	104 ± 2^ab
	TClHCl	HNO₃	1	23.1 ± 0.4^bc	97 ± 2^bc
		HNO₃	20	20.9 ± 0.3^cd	87 ± 1^cd
		HCl	1	25.6 ± 0.3^ab	107 ± 1^ab
		HCl	20	23.6 ± 0.5^b	99 ± 2^b
6	TMN	HNO₃	1	19 ± 1^de	79 ± 5^de
		HNO₃	20	18 ± 1^de	77 ± 5^de
		HCl	1	21 ± 1^cd	87 ± 4^cd
		HCl	20	18 ± 1^e	75 ± 5^e
	TClHCl	HNO₃	1	20. ± 1^de	82 ± 5^de
		HNO₃	20	18 ± 1^de	77 ± 5^de
		HCl	1	19 ± 1^de	80. ± 5^de
		HCl	20	18 ± 1^de	76 ± 5^de

ISSN: 2661-801X