Table 4. Organic acid content of commercial orange and grapefruit juices

(mg/mL)

Sample Citric acid Lactic acid Tartaric acid Malic acid Oxalic acid Ascorbic acid Total

OJ1 7.12±0.34¹⁾^c²⁾ 0.97±0.53^c 0.69±0.08^a 1.82±0.63^a 0.26±0.14^a 0.20±0.01^c 11.40±2.63^d

OJ2 7.63±0.91^c 4.31±0.93^a 0.58±0.11^a^b 1.55±0.29^b 0.26±0.04^b 0.42±0.08^a 14.10±2.94^b^c

OJ3 6.73±0.13^c 3.13±0.43^b 0.61±0.07^a 1.74±0.10^a^b 0.28±0.02^b 0.35±0.04^a^b 12.83±2.51^c^d

GJ1 12.01±0.22^a 1.88±0.22^c 0.35±0.09^c 1.19±0.01^c 0.35±0.01^a 0.21±0.01^c 16.00±4.62^a

GJ2 10.77±0.48^b 3.26±0.46^b 0.32±0.05^c 0.88±0.06^d 0.26±0.00^b 0.30±0.03^b 15.79±4.15^a^b

GJ3 10.13±0.47^b 1.52±0.41^c 0.50±0.10^b^c 1.48±0.04^b 0.31±0.01^a^b 0.19±0.01^c 13.93±3.96^b^c

¹⁾Mean±SD (n=3).
²⁾Values with different superscript letter in the column are significantly different at p<0.05 by Duncan’s multiple range test.

Sample	Citric acid	Lactic acid	Tartaric acid	Malic acid	Oxalic acid	Ascorbic acid	Total
OJ1	7.12±0.34¹⁾^c²⁾	0.97±0.53^c	0.69±0.08^a	1.82±0.63^a	0.26±0.14^a	0.20±0.01^c	11.40±2.63^d
OJ2	7.63±0.91^c	4.31±0.93^a	0.58±0.11^a^b	1.55±0.29^b	0.26±0.04^b	0.42±0.08^a	14.10±2.94^b^c
OJ3	6.73±0.13^c	3.13±0.43^b	0.61±0.07^a	1.74±0.10^a^b	0.28±0.02^b	0.35±0.04^a^b	12.83±2.51^c^d
GJ1	12.01±0.22^a	1.88±0.22^c	0.35±0.09^c	1.19±0.01^c	0.35±0.01^a	0.21±0.01^c	16.00±4.62^a
GJ2	10.77±0.48^b	3.26±0.46^b	0.32±0.05^c	0.88±0.06^d	0.26±0.00^b	0.30±0.03^b	15.79±4.15^a^b
GJ3	10.13±0.47^b	1.52±0.41^c	0.50±0.10^b^c	1.48±0.04^b	0.31±0.01^a^b	0.19±0.01^c	13.93±3.96^b^c