Table 2.

Spasmolytic effect on rat ileum trips of two varieties of Citrus sinensis L. Osbeck.

National variety extracts	E max (%)	EC50 (µg/mL)	Valencian variety extracts	E max (%)	EC50  (µg/mL)
HAN	43.80 ± 6.32	ND	HAV	51.98 ± 1.98	ND
MAN	14.62 ± 1.69	ND	MAV	35.98 ± 1.42	ND
HFN	64.87 ± 3.04	300.31	HFV	68.91 ± 4.14	287.46
MFN	31.01 ± 3.92	ND	MFV	51.28 ± 2.59	ND

Papaverine (positive control): E_max = 90% and EC₅₀ = 12.44 µg/mL.

E _max: maximum effect; EC₅₀: effective concentration medium.

ND: Undetermined.