Assessment of a fruit extract (Sechium edule) on the labeling of blood elements with technetium-99m

Abstract

Natural products have been widely used by human beings. However, sometimes the biological effects of 
these products are not fully known. Chayotte (Sechium edule) is a vegetable used in the folk medicine. Red 
blood cells (RBC) labeled with technetium-99m (99mTc) have several clinical applications. The aim of this 
work was to evaluate the influence of an extract of chayotte on the labeling of blood elements with 99mTc 
using stannous chloride (SnCl2) in the concentrations like to 1.2, 0.006, 0.0005 and 0.0006 g/ml. The extract 
of chayote was incubated in various concentrations for 1hour with blood which was withdrawn from Wistar 
rats. After that SnCl2 was added and the incubation continued for more 1 h. Elapsed this time 99mTc as 
sodium pertechnetate (NaTcO4) was toted. The blood was centrifuged and plasma (P) and RBC were isolated, 
also precipitated with trichloroacetic acid (TCA, 5%) and soluble (S) and insoluble (I) fractions (F) of plasma 
and cells (C) were determined. The radioactivity (ATI%) was rated in RBC, IF-P and IF-C. The results have 
showed that extract was able to reduce the radiolabeling using SnCl2 (0.006, 0.0005 and 0.0006g/ml). We can 
speculate that this effect may be on account of the products with oxidant proprieties.