Table 3 Organic acid contents in water extract of Solanum nigrum fruits depending on harvest time (%)

Harvest time	Oxalic acid	Malic acid	Citric acid	Acetic acid	Total organic acids
Sep. 27th	0.14±0.011)	0.56±0.04	0.13±0.02	0.54±0.04	1.37±0.02
Oct. 4th	0.06±0.01	0.69±0.03	0.17±0.01	0.68±0.03	1.6±0.01
Oct. 11th	0.05±0.02	0.85±0.05	0.19±0.01	0.61±0.05	1.7±0.02
Oct. 18th	0.08±0.01	0.93±0.02	0.29±0.03	0.66±0.07	1.96±0.02
Oct. 25th	0.04±0.01	0.62±0.04	0.47±0.02	0.81±0.02	1.94±0.01
Nov. 1th	0.09±0.02	0.63±0.03	0.29±0.04	0.69±0.05	1.7±0.02

Each value represents the mean±SD of three determinations.