Jl. Ferreira, Comparison of amplified ELISA and mouse bioassay procedures for determination of botulinal toxins A, B, E, and F, J AOAC INT, 84(1), 2001, pp. 85-88
The amplified enzyme-linked immunosorbent assay (amp-ELISA) was compared to
the mouse bioassay for determination of botulinal neurotoxin types A, B, E
, and F, Twelve different toxin-producing type A, 13 proteolytic type B, 9
nonproteolytic type B, 16 type E, 8 proteolytic type F, 5 nonproteolytic ty
pe F, and 6 nontoxigenic clostridial strains were tested, The cultures were
inoculated into cooked meat medium (CMM) and tryptone-peptone-glucose-yeas
t extract (TPGY) medium, incubated for 5 days, and then examined for biolog
ical toxicity in mice and amp-ELISA endpoints, The amp-ELISA was less sensi
tive in detecting toxins produced by nonproteolytic than proteolytic strain
s of type B and F organisms. All of the toxin-producing strains tested were
positive by the AOAC method and the amp-ELISA in either undiluted TPGY or
CMM culture fluids regardless of mouse toxicity level, source, or strain. C
ross-reactivity was observed between some but not all of the botulinal stra
ins tested, None of the nontoxigenic strains were positive by the amp-ELISA
, Purified botulinal toxins were also assayed using these 2 methods. The se
nsitivity of the amp-ELISA using purified neurotoxins was about 0.1 ng/mL f
or types A, B, and E and about 1.0 ng/mL for type F.