Biological Activity of the Secondary Compounds of
Guazuma ulmifolia Leaves
to Inhibit the Eggs
Haemonchus contortus Hatching
J Velázquez-Antunez1, J Olivares-Perez*1, A
Olmedo-Juárez*2, S Rojas-Hernandez1, A
Villa-Mancera3, T Romero-Rosales1, Zamilpa A4
and Gonzalez-Cortazar M4
1Maestría
en Ciencias Agropecuarias y Gestión Local, Universidad Autónoma de
Guerrero, Iguala, México
2Centro
Nacional de Investigación Disciplinaria en Salud Animal e Inocuidad,
INIFAP, Morelos, México
3Facultad
de Medicina Veterinaria y Zootecnia, Benemérita Universidad Autónoma
de Puebla, México.Centro de Investigaciones Biomédicas
del Sur, IMSS, Xochitepec, Morelos, México.
*Corresponding authors:
olivaares@hotmail.com,
olmedo.agustin@inifap.gob.mx
Abstract
Epidemiologically Haemonchus contortus
is the most important parasite in the tropics, females can produce up to ten
thousand eggs and blood feed. As objective, it was evaluated the
in vitro effect of the secondary
compounds of Guazuma ulmifolia leaves
extracted with hydroalcoholic (HA) solvent and by fractionation in liquid-liquid
layer with ethyl acetate, to inhibit eggs hatching of
H. contortus, to interrupt the
biological cycle of the parasite.
The bioactive compounds were identified by high performance liquid
chromatography.
Challenged doses were in the HA extract 1.25-40 mg/mL, and aqueous and organic
fractions of 1.25-10 mg/mL, respectively,
distilled water and 2% methanol were negative controls and thiabendazole (0.1
mg/mL) positive control, for a total of seventeen treatments.
The treatments were tested in three replicates with four repetitions, the data
were analyzed with a GLM in a completely randomized design using ANOVA to an
alpha ≤0.05. The effective concentrations (EC50 and EC90)
were estimated by Probit analysis in the SAS program. The secondary compounds
identified were of the phenols group such as flavonols, flavones, coumaroyl
derivatives and hydroxycinnamic acid. The HA extract and aqueous fraction showed
a similar effect to the positive control from doses of 2.5 mg/mL and the organic
fraction from 1.5 mg/mL (P<0.01). In HA extract and aqueous fraction, the EC50
and EC90 were similar, but in the organic fraction the ovicidal
effect was at lower EC50 (0.86 mg/mL) and EC90 (1.67 mg/mL).
In conclusion
G. ulmifolia
leaves contain secondary compounds able for interrupting the cycle of
H. contortus in the egg stage and the
content of phenols
like
hydroxycinnamic acid
and coumaroyl derivatives could be responsible for the ovicidal effect.
To Cite This Article:
Velázquez-Antunez J, Olivares-Perez J, Olmedo-Juárez A, Rojas-Hernandez S,Villa-Mancera A, Romero-Rosales T, Zamilpa A, Gonzalez-Cortazar M, 2022.
Biological activity of the secondary compounds of
Guazuma ulmifolia leaves to inhibit
the eggs Haemonchus contortus
hatching.
Pak Vet J. http://dx.doi.org/10.29261/pakvetj/2022.075