Extracción de taninos presentes en el banano verde
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Fecha
2004
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Editor
Corporación Universitaria Lasallista
Resumen
Introduction: Green rejected bananas are a remain
from harvests, they contain high quantities of tannins
and polyphenols and low contents of fibers and
proteins. Tannins are antinutritional substances, and
that is why they do not allow the use of rejected green
bananas (“boleja”) in animal feeding, as an energy
source. The selective extraction with solvents is a
route of separation to obtain tannins. The results
shown in this work are an evidence that this
separation method is effective to remove tannins
from the “boleja”. Objective: Extract the tannins
from rejected green bananas (“boleja”) using the
extraction with solvents. Materials and methods: The
obtaining of alcoholic and watery extracts and their
qualitative evaluation was made by combining
different extraction and qualitative tannin´s
determination procedures, thoroughly shown in the
chemical and instrumental analysis literature. The
quantitative tannin´s analysis was made by
colorimetric methods, using a UV/VIS
spectrophotometer in which the samples were read
at 700 mn and referred to tannic acid. As a reference
substance tannic acid from the Merck brand was
used. To measure the absorbing rate a UV-VIS
SPECTRONIC-20 spectrophotometer was used.
Results: the lineal correlation coefficients calculated
for the calibration curves were: From tannic acid:
0.9983, from sample A –alcoholic extract: 0.9977,
from sample A –watery extract: 0.9822, from sample
B: -Alcoholic extract: 0.9999 and from sample B
watery extract: 0.9938. Conclusion: The extraction
of tannins from rejected green bananas (“boleja”)
with a 1:1 methanol-water solution is more efficient
and effective than tannin´s extraction with water.
Descripción
Palabras clave
Taninos, Banano verde, Residuos de cosecha, Corporación Universitaria Lasallista, Sustancias antinutricionales, Residuos agrícolas