Cocos nucifera
L. is a palm tree
(Arecaceae) with a high economic value. The coconut husk fibers are
nonedible, thick, and abrasion-resistant and correspond up to 85%
of biomass discarded as solid waste residue. Therefore, the husk fibers
are an underexploited byproduct with a high content of extractives
of unreported nature. Two varieties of
C. nucifera
L. husk extracts were investigated to uncover bioactive metabolites
and their possible application as a green corrosion inhibitor for
carbon steel AISI 1020 under neutral pH conditions. The chemical analysis
indicated 3% (w/w) of proanthocyanidins in the husk fibers with a
high B-type procyanidin content. The husk fibers’ crude extract
showed promising results as an eco-friendly corrosion inhibitor for
carbon steel AISI 1020 under neutral pH conditions. Although it formed
a film on the metal surface in all tested concentrations (0.4, 0.8,
1.2, and 1.6 g L
–1
), the highest protective efficiency
was shown at a concentration of 1.2 g L
–1
, determined
by electrochemical techniques and mass loss. This was the first comprehensive
report on coconut husk fibers’ chemical composition, which
was similar between the two varieties with potential for industrial
application.
This paper describes, for the first time to our knowledge, a fast-response and specific
biosensor for detection of Taenia solium, a parasite
responsible for neurocysticercosis disease that affects the central
nervous system. The biosensor is based on the localized surface
plasmon resonance (LSPR) technique on gold nanoparticles (AuNPs) in
colloidal suspension that were functionalized and activated with
antibodies to perform an immuno-capture effect. The AuNPs were
synthetized by Turkevich and seed-mediated growth methods. A variety
of concentrations of T. solium antigen
were added to test the detection and the dose-response profile. Small
antigen concentrations were detected indicating that the limit of
detection is lower than 0.1 µg/mL of antigen. The results demonstrate
the potential of the AuNPs LSPR biosensor as a clinical tool for
neurocysticercosis diagnostic.
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