Transcript Bez tytułu slajdu

On
the
Track
of
Modern
Physics
This poster is dedicated to the memory of prof. Werner Lindinger
How to dress a salat?
Poles would do it with sauercream, Italians with oil and
vinegar, French and
Americans with a special,
mayonnaise-like dressing.
How to measure 10-27 kg mass?
F.W. Aston was the first who showed
that neon, that of red lamp, is a mixture
of different atoms. The photo to the left
is his first mass spectrometer with the
magnetic deflection.
What do these dressings have
in common? A fat!
The photo to the right is his article
from 1920 on existence of different
isotopes in neon.
A fat to a vegetarian course?
Science Museum, London.
Deutsches Museum, München.
Impossible!
LEBENSMITTELFORSCHUNG MITTELS PTR-MS
D. Mayr, E. Boscaini, C. Lindinger, W. Lindinger, T. Märk
Quadrupole mass spectrometers are
the most versatile tools. They use a
variable (a few MHz) frequency
electrical field to guide only the ions
with a determined ratio charge-to
mass.
They work like potato-selectors:
shaking ions left and right and
leaving only those with a right mass.
Production of heavy organic molecules,
“wound” compounds, after cutting salad
and its inhibition by adding oil.
-1800V
Time-of-flight mass spectrometer is simply a long tube.
Lighter ions travel faster than
heavy, so they arrive first
(assuming the same initial
acceleration potential applied).
A new type of mass spectroscopy just showed that “Yes!”
You must add fat to the green
salad.
dK, UK
L2
R
dT, UT
Uimp
+240V
L1
electrons
Uion +50V
Ubat
U0
P1
cathode
P2
While cutting, the leave, still
alive, produces some bitter
chemical substances, “wound
compounds”.
P3
-15V
0 – 3kV
+240V
UZ -3V
-200V
PAP, Slupsk
And the oil neutralizes them.
Thanks to prof. Davide Bassi, Trento University
It seems, that, soon, the strawberries flavour will
be measured, catalogued, standardized and
normalized, and all deviations from the ideal on
will be punished in all majesty of law.
Shemat PTMS, rys. 1, a
Europhysic News Nov. 200
Jak nie masz to przesle, jak
powiesz.
Proton-transfer-reaction mass spectroscopy
From: 2nd Int. Conf. PTRMS and Its Applications, Institute für Ionenphysik der
Leopold-Franzens-Universität, 2004, editor A. Hansel and T. Märk
CH3CO-OC 2H5
CH3COOH
CH3CO-OCH3
100000
CH3-CO-CH 3
CH3CHO
1000000
CH3OH
1E7
cps
For sure, beautifully! especially when we taste
them in December!
And how do they smell in summer? Differently?
C2H5OH
1E8
10000
1000
100
10
40
60
80
100
m/e
The flavour (i.e. its mass spectrum) of fresh strawberries, from proton transfer mass spectrometer.
Analysis of the spectra was performed only for the simplest chemical species like methanol, ethanol, acethylaldehyde, acetone, acetic acid, methyl acetate and ethyl acetate. Methyl and ethyl alcohols there can be treated
as "vectors", carrying another smelling substances. Methyl and ethyl octanes have a pleasant flavour, rest of
the substances are odorous.
One of the main problems in mass spectrometry is how to ionize a
molecule, without destroying it. Only ionized (i.e. those which lost or
gained an electron) atoms and/or molecules and/or radicals can be trapped
and transported by (relatively) weak electric and magnetic fields.
But ionization by collision with electrons or photoionization usually breaks
the parent molecule in many fragments. The new, “soft” ionization, uses
proton transfer of a proton from the ionized H3O+ molecule to the searched
molecule. This transfer does not destroy the parent molecule and allows the
flavour of strawberries to be measured.
This was the transfer of proton,
but also transfer by proton exists.