violet), water-based and epoxyphenolic lacquers have been characterized as
coatings for possible application in vegetable canning industry. These lacquers
were applied to three different types of tinplates and tin free steel (TFS).
The behaviour of lacquers was monitored applying porosity, flexibility and
infrared (IR) reflectance spectroscopy tests. With IR reflectance spectroscopy
test, we were able to determine the composition of lacquers. Using porosity and
flexibility tests, performed by electrochemical methods, it was possible to
characterize the best lacquer for food canning. In this work the variables
involved in lacquering, e.g. the weight of coating and the degree of
polymerization of lacquers were also taken into account.
Authors:L. Locsmándi, G. Kövér, G. Bázár, A. Szabó, and R. Romvári
The feasibility of NIR spectroscopy for
determining chemical composition of goose fatty liver was studied. The spectra
of 50 fresh, homogenized liver samples (ether extract content EE=53.2,
SD=4.87%) were taken between 1100 and 2500 nm in reflectance mode, then the
chemical composition and the fatty acid profile was measured (gas
chromatography). Calibration equations were developed using modified partial
least-squares regression. The R
value in estimation of DM, CP and total EE were 0.72, 0.63 and 0.81,
respectively. For the major fatty acids (oleic, palmitic and stearic acid,
51.4, 25.8 and 15.5% of total) the R² values were 0.94, 0.93 and 0.16. The
estimation of the total saturated fatty acid (SAT) proportion and the so-called
unsaturation index (UI) value was effective (R
=0.81 and 0.79, respectively).
The paper demonstrates the usefulness of the NIRS method as a fast and solvent
free alternative of liver qualification. For practical purposes a larger number
of fatty liver samples are needed.
Authors:Nouga C. Batista, José L. Silva Sá, Bruce R. McGarvey, Douglas W. Franco, and Benedito S. Lima-Neto
spectroscopy. Studies on cis -[Ru(NH 3 ) 4 (H 2 O) 2 ](tfms) 3 and [Ru(NH 3 ) 5 H 2 O](tfms) 3 as probe complexes with the monomer and different organic compounds representing the organic functions in the monomer (furan, norbornene, but-2-ene-1,4-diol and
Authors:Zs. Csanádi, P. Cserjési, N. Nemestóthy, and K. Bélafi-Bakó
FT-IR spectra of various pectin preparations extracted from press cakes of red and black currant, raspberry and blackberry have shown structural differences. Based on the spectra data degree of esterification (DE) of the pectins was determined and found to be in the range of 50–65.
This work describes the experimental determination of sucrose hydrolysis kinetics using a heterogeneous catalyst. We used
an Amberlite IR-120 strong acidic cation-exchange resin. The experiments were performed under previously determined optimal
process conditions: sucrose mass concentration, γS = 50 g L−1, catalyst mass concentration, γC = 180 g L−1, rotational frequency of the stirrer fm = 180 min−1, and temperature ϑ = 79 °C. The parameters of the supposed kinetic model were determined using experimental data. The kinetics
of sucrose hydrolysis over Amberlite IR-120 has not been reported to date. Therefore, we could not directly compare the calculated
values of kinetic parameters with those from the literature. However, the calculated values are within the range of values
determined by other types of catalysts. Furthermore, we investigated the influence of catalyst mass concentration γC on the reaction rate constant k′.