347 research outputs found
Sensory and chemical modifications of wine brandy aged with chestnut and oak wood
This work evaluated the sensorial and chemical modifications in
brandy aged in presence of two types of wood fragments in comparison with a brandy aged in
wooden barrels
GC-FID and GC-MS as a tool to screen the influence of wood ageing technologies in the brandies odourless and odourant compounds
The maturation of wine brandies in wooden barrels cause many sensory and
physicochemical changes in these alcoholic beverages, namely its flavour modification.
Previous work (Caldeira et al. 2008) pointed out the most potent odourant compounds of
the wine aged brandies. Some of these compounds proceed from the distillate and others
are extracted from the wood.
In this study it was quantified, some odourless compounds, such as methanol and higher
alcohols and several odorant compounds in brandies aged in presence of two types of
wood fragments (staves and tablets), from two different kinds of woods (Limousin oak
wood and Portuguese chestnut wood), and compared with those found in the same with
brandy aged in wooden barrels. A taster panel have also profiled these brandies and
evaluated their overall quality.
The methanol and higher alcohols were quantified by GC-FID equipped with a fused silica
capillary column of polyethylene glycol according to the official method [NP 3263, 1990].
The odorant compounds were quantified by GC-FID and identified by GC-MS.
The results showed that the ageing system is the most discriminant factor, having a
significant effect on the level of several odourant compounds. The wood botanical species
affected few odourant compounds. The importance of odorant compounds was also
demonstrated by the high linear correlations between their contents and the intensity of
several sensory attributes.
The results show the possibility of using the chromatographic results as a tool to
discriminate brandies produced with different ageing technologies
Efeito de agentes clarificantes na composição volátil do hidromel
info:eu-repo/semantics/publishedVersio
Honey characterization by FTIR-ATR spectroscopy
info:eu-repo/semantics/publishedVersio
Development of a biodegradable plastic film extruded with the addition of a Brazilian propolis by-product
The development of new materials environmentally friendly has become an important market niche for the food
industry. The agro-industrial wastes and by-products can be an alternative for the production of biodegradable
food packaging. The work aimed to produce biodegradable plastic film extruded with antioxidant and antibacterial
properties by the joining of cassava starch and Brazilian propolis by-product (BPB). The volatile profile
of BPB, Brazilian propolis by-product film (BPBF), and control film (CF) were analyzed by gas chromatography.
The mechanical, antioxidant, and antibacterial properties of the films were also assessed. Eighty-seven volatile
compounds were detected with aldehydes and terpenoids predominating in the samples. The major terpenoid
detected in the samples was the 2-pinen-10-ol followed by α-copaene. Benzaldehyde and benzenepropanoic acid
ethyl ester were the major aldehyde and ester classes present in the films. The BPBF exhibited promising mechanical
properties showing the highest Elasticity modulus (11.96 Mpa) and excellent antioxidant (8.45 mmol
Trolox equivalent/g) and antibacterial (12.5 mg/mL against Staphylococcus aureus and Salmonella Typhimurium)
activities. The valorization of agro-industrial by-products following the current trends to environmental care can
be a sustainable alternative for the development of a plastic into which the propolis by-product is incorporated in
biodegradable packaginginfo:eu-repo/semantics/publishedVersio
Relativistic Description of Exclusive Semileptonic Decays of Heavy Mesons
Using quasipotential approach, we have studied exclusive semileptonic decays
of heavy mesons with the account of relativistic effects. Due to more complete
relativistic description of the quark more precise expressions for
semileptonic form factors are obtained. Various differential distributions in
exclusive semileptonic decays of heavy mesons are calculated. It is argued that
consistent account of relativistic effects and HQET motivated choice of the
parameters of quark-antiquark potential allow to get reliable value for the
ratio in the decay as well as the
ratio~. All calculated branching
ratios are in accord with available experimental data.Comment: 18 pages, LATEX, 2 figures inclosed + 4 Postscript figure
The exposure of the hybrid detector of the Pierre Auger Observatory
The Pierre Auger Observatory is a detector for ultra-high energy cosmic rays.
It consists of a surface array to measure secondary particles at ground level
and a fluorescence detector to measure the development of air showers in the
atmosphere above the array. The "hybrid" detection mode combines the
information from the two subsystems. We describe the determination of the
hybrid exposure for events observed by the fluorescence telescopes in
coincidence with at least one water-Cherenkov detector of the surface array. A
detailed knowledge of the time dependence of the detection operations is
crucial for an accurate evaluation of the exposure. We discuss the relevance of
monitoring data collected during operations, such as the status of the
fluorescence detector, background light and atmospheric conditions, that are
used in both simulation and reconstruction.Comment: Paper accepted by Astroparticle Physic
Excited Heavy Baryons in the Bound State Picture
The orbitally excited heavy quark baryons are studied in the Callan Klebanov
bound state model with heavy spin symmetry. First, a compact description of the
large , infinite heavy quark mass bound state wavefunctions and the
collective quantization is given. In order to study the kinematical corrections
due to finite masses we motivate an approximate Schrodinger-like equation for
the bound state. The effective potential in this equation is compared with the
quadratic approximation (spherical harmonic oscillator) to it. This oscillator
approximation is seen to be not very accurate. It is noted that the present
experimental information cannot be even qualitatively understood with the usual
light sector chiral Lagrangian containing only light pseudoscalar mesons. The
addition of light vector mesons helps to overcome this problem.Comment: LaTex, 23 pages, SU-4240-586/UCI-TR 94-3
Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment
This paper describes an analysis of the angular distribution of W->enu and
W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with
the ATLAS detector at the LHC in 2010, corresponding to an integrated
luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and
the missing transverse energy, the W decay angular distribution projected onto
the transverse plane is obtained and analysed in terms of helicity fractions
f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV
and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw
> 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour,
are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017
+/- 0.030, where the first uncertainties are statistical, and the second
include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables,
revised author list, matches European Journal of Physics C versio
Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS
The chi_b(nP) quarkonium states are produced in proton-proton collisions at
the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS
detector. Using a data sample corresponding to an integrated luminosity of 4.4
fb^-1, these states are reconstructed through their radiative decays to
Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks
corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new
structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is
also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes.
This is interpreted as the chi_b(3P) system.Comment: 5 pages plus author list (18 pages total), 2 figures, 1 table,
corrected author list, matches final version in Physical Review Letter
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