Antimicrobial Activity of Aspergillus sp. from the Amazon Biome: Isolation of Kojic Acid

Table 3

¹H,¹³C NMR data of kojic acid (in DMSO-d₆: 300 MHz (H) 75 MHz (C)). Literature data obtained in CD₃OD: 500 MHz (H) 125 MHz (C).

Position	Presented data		Literature data
	^13C (ppm)	^1H (ppm)	^13C (ppm)	^1H (ppm)	HMBC
1	-			-
2	168.41		170.41
3	110.23	6.33 s, 1H	110.74	6.49 s, 1H	C-2, C-3, C-4, C-5, C-7
4	174.33		176.86	-
5	146.05		147.37
6	139.68	8.02 s, 1H	141.0	7.95 s, 1H	C-2, C-4, C-5, C-6
7	59.88	4.29 s, 2H	61.18	4.40 s, 2H	C-2, C-3, C-7
C7–OH		5.67 s, 1H			C-2, C-3, C-7
C5–OH		9.06 s, 1H			C-6

The data obtained from DellaGreca et al. [33]. Chemical shift in ppm, coupling constants in Hz. s (singlet).