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VIEW ARTICLE DOI: 10.1094/ASBCJ-54-0085
Confirmation by Pyrolysis-Gas Chromatography of the Absence of Polyvinylpyrrolidone in Beer Treated with Cross-linked Polyvinylpyrrolidone. T. M. H. Cheng and E. G. Malawer, Analytical Department, International Specialty Products, 1361 Alps Road, Wayne, NJ 07470; 201/628-3096; Fax 201/628-3633. J. Am. Soc. Brew. Chem. 54(2):85-90. Accepted September 28, 1995.
A pyrolysis-gas
chromatography
method was developed
for the determination
of residual
polyvinylpyrrolidone
(PVP) in beers
that had been
treated with
cross-linked
PVP for the
removal of chill
haze. The method
is more specific
and much simpler
to use than
are existing
methods, which
are mostly based
on the formation
of complexes
between PVP
and certain
phenolic dyes.
The range of
application
of the method
was 1-10 ppm
in beer. The
method involved
a 10-fold sample
preconcentration
by precipitation
with tannic
acid, the pyrolytic
decomposition
of PVP, and
the detection
of the vinylpyrrolidone
generated using
a nitrogen detector.
A quartz sample
holder was used
to obtain a
linear calibration
curve from 1
to 10 ppm PVP
in beer. Several
commercial beers
were analyzed,
and no soluble
PVP was detected
in any of them.
Keywords: Beer,
Cross-linked
PVP, Gas chromatography,
PVP, Pyrolysis.
Un
método
usando pirólisis-cromatografía
de gases fue
desarrollado
para determiner
polivinilpirrolidona
residual (PVP)
en cervezas
que han sido
tratadas con
PVP entrelazado
para la eliminación
de la turbidez
en frío.
El método
es mucho más
especffico y
simple de usar
que los métodos
existentes,
que están
basados en la
formación
de complejos
entre el PVP
y algunos colorantes
fenólicos.
El rango de
aplicación
del método
es desde 1 hasta
10 ppm en cerveza.
El método
involucra una
concentración
previa de la
muestra por
precipitación
con ácido
tánico,
la descomposición
pirolítica
del PVP y la
detección
de la vinilpirrolidona
generada usando
un detector
de nitrógeno.
Un compartimento
de cuarzo para
la muestra fue
usado para obtener
una curva de
calibración
lineal en el
rango de 1 a
10 ppm de PVP
en cerveza.
Varias cervezas
del mercado
fueron analizadas,
no encontrándose
PVP soluble
en ninguna de
ellas.
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A subscription to the Journal of the American Society of Brewing Chemists is complimentary with membership to the ASBC. The ASBC Journal publishes scientific papers, review articles, and technical reports dealing with the chemistry and microbiology of brewing ingredients and relevant technology, as well as the analytical techniques used in the malting and brewing industry. |