Mass spectrometry is a technique used for structural elucidation, molecular mass determination, and compound identification. It works by ionizing molecule fragments and separating the ions based on their mass-to-charge ratios. The key components are the ion source, mass analyzer, and ion detector. Common ionization methods include electron impact, chemical ionization, electrospray, and matrix-assisted laser desorption ionization. Popular mass analyzers are quadrupoles, time-of-flight, and ion traps. Mass spectrometry has wide applications in fields like pharmaceuticals, petrochemicals, polymers, and biomedicine.
MASS SPECTROSCOPY ( Molecular ion, Base peak, Isotopic abundance, Metastable ...Sachin Kale
CONTENT:
Molecular Ion Peak
Significance of Molecular ion & Graphically Method
Base Peak
Isotopic Abundance
Metastable Ion
Significance of Metastable ion
Nitrogen Rule & graphs
Formulation of Rule
MASS SPECTROSCOPY ( Molecular ion, Base peak, Isotopic abundance, Metastable ...Sachin Kale
CONTENT:
Molecular Ion Peak
Significance of Molecular ion & Graphically Method
Base Peak
Isotopic Abundance
Metastable Ion
Significance of Metastable ion
Nitrogen Rule & graphs
Formulation of Rule
Mass Spectrometry (MS) is an analytic technique used to determine the relative masses of molecular ions and fragments by calculating the degree of deflection of charged particles in a magnetic field.
It provides a great deal of information with very small amount of samples.
various parts of mAss spectroscopy, applications, principle, peaks, rules, typical mass spectra, various combinations, Fragmentation, rules of fragmentation and useful points which can help Chemical and analytical students and structural elucidation.
introduction and principle of Mass spectrometry with its components.
ionization , accelerators deflection and detection, types of MS, different types of ion sources , types of mass analyzers , advantages and disadvantages of different types of ion source and mass analyzers, different types of detectors for the ions dectections
Mass Analyzers for example Magnetic Sector Mass Analyzer, Double Focusing Mass Analyzer, Quadroupole Mass Analyzer, Time of Flight Mass Analyzer and Applications of Mass Analyzer were explained
TYPES OF PEAKS IN MASS SPECTROSCOPY.pptxAnupamaCp2
Types of peaks in mass spectroscopy.
Molecular ion or parent peak.
base peak.
fragment ions.
rearrangement ion.
multiple charged ion.
negative ion.
metastable ion.
isotopes ion.
Mass Spectrometry (MS) is an analytic technique used to determine
the relative masses of molecular ions and fragments by calculating the
degree of deflection of charged particles in a magnetic field.
It provides a great deal of information with very small amount of samples.
Mass Spectrometry (MS) is an analytic technique used to determine the relative masses of molecular ions and fragments by calculating the degree of deflection of charged particles in a magnetic field.
It provides a great deal of information with very small amount of samples.
various parts of mAss spectroscopy, applications, principle, peaks, rules, typical mass spectra, various combinations, Fragmentation, rules of fragmentation and useful points which can help Chemical and analytical students and structural elucidation.
introduction and principle of Mass spectrometry with its components.
ionization , accelerators deflection and detection, types of MS, different types of ion sources , types of mass analyzers , advantages and disadvantages of different types of ion source and mass analyzers, different types of detectors for the ions dectections
Mass Analyzers for example Magnetic Sector Mass Analyzer, Double Focusing Mass Analyzer, Quadroupole Mass Analyzer, Time of Flight Mass Analyzer and Applications of Mass Analyzer were explained
TYPES OF PEAKS IN MASS SPECTROSCOPY.pptxAnupamaCp2
Types of peaks in mass spectroscopy.
Molecular ion or parent peak.
base peak.
fragment ions.
rearrangement ion.
multiple charged ion.
negative ion.
metastable ion.
isotopes ion.
Mass Spectrometry (MS) is an analytic technique used to determine
the relative masses of molecular ions and fragments by calculating the
degree of deflection of charged particles in a magnetic field.
It provides a great deal of information with very small amount of samples.
Mass spectrometry is an extremely valuable
analytical technique in which the molecules
in a test sample are converted into gaseous
ions that are subsequently separated in a mass
spectrometer according to their mass-to-charge
ratio (m/z) and detected .
Uploaded By: Mr. Shubham sutradhar (masters in
pharmaceutical Chemistry).
Mass spectroscopy & it's instrumentations, Ionization Techniques, Mass Spectroscopic Analyzers & it's applications. above topics are discussed in a brief format.
It is an analytical technique useful for the determination of molecular mass, molecular formula and fragmentation pattern of particular molecule and compounds. It has greater application in pharmaceutical and medicinal fields.
it is an analytical technique that measures the mass-to-charge ratio of ions. The results are typically presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio.
Analyser of Quadrupole and time of flight.Mass Analysers.
Summary of Mass Analyser.
Quadrupole mass spectrometer.
Factors Affecting Function Of Quadrupole.
Principal, Construction & Working.
Linear Time of flight mass spectrometer.
Time Of Flight Mass Spectrometry, Need For Variant Type Of Time of Flight Analyser.
Variant Of Linear TOF Analyser.
Ion mirror / ion reflectron / reflectron. Time-lag focussing.
Advantages, Disadvantage, Application.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
1. Mass Spectrometry
Presented by,
Ms.Smita P.Shelke,
Assistant Professor
Gokhale Education Society’s
Sir Dr M.S. Gosavi College Of Pharmaceutical Education & Research
Prin.T.A.Kulkarni Vidyanagar, Nashik-422005
India (Maharashtra). Ph No. 0253 2232799.
2. Mass Spectrometry
Used by Three Ways:-
For structural elucidation of ionic
fragments
Measurement of relative molecular
mass: molecular formula
Comparison and identification of
known compounds
3. Theory of MS
MS separates individual atoms because of differences
in their masses
consider M is a molecule focused with beam of e-
M + e- M+ + 2e-
ions accelerated with voltage V,
now energy of each particle = kinetic energy
½ mv2 =eV………………………..(1)
• v= Velocity of particle
• m= Mass of particle
• e= Charge on electron
• V= Voltage
4. Now charge particles enter a magnetic field H, field
attracts the particle and they move in a circle around
it with a force Hev
• However particles have centrifugal force mv2 /r
• When these two forces are equal :molecule start
moving: i.e.
mv2 /r = Hev………………..(2)
• v= Velocity of particle
• m= Mass of particle
• r= Radius of circle
• H= magnetic field
• e= Charge on electron
5. m/e = H2 r2 / 2V…………..(3)
• m/e= mass to charge ratio is depends on H, V and r
As e, V and H are constant
• m= mass is depends on r
11. Basic Components of MS Instrument
Sample Inlet System
Ion Source / Ionization Chamber
Electrostatic Accelerating System
Ion Seperator / Analyser
Magnetic Field
Ion Collector
Vacuum System
12. Sample Inlet Systems in MS
Sample must be in vapour phase
Less volatile heated before injection in
ampoule.
Smples with less vapour pressure are with
Probe
13. IONIZATION METHODS
1. Gas Phase
Electron Impact
Chemical Ionization
Field Ionization
2. Desorption Phase
Field desorption
Electro spray Ionization
MALDI
FAB
Thermo spray Ionization
14. Electron Impact (EI)
A high energy electron beam dislodges an
electron from a
sample molecule to produce a positive ion
M + e → M+. + 2e
M= analyte molecule, M+.= Radical ion
16. Benefits
o well-understood
o can be applied to virtually all volatile
compounds
o reproducible mass spectra
o fragmentation provides structural
information
o libraries of mass spectra can be searched
for EI mass spectral "fingerprint"
17. Chemical Ionization (CI)
Gaseous atoms of the sample are
bambarded with reagent gas.
Reagent gas- methane gas
All of the primary ions of methane
react rapidly with methane (at virtually
every collision) to give product ions
18. Mechanism of Methane gas
Collison of methane to produce ions
CH4
+ + CH4 --> CH5
+ + CH3
CH3
+ + CH4 --> C2H5
+ + H2
Interaction of ions with molecule M
MH + C2H5
+ --> MH2
+ + C2H4
MH + C2H5
+ --> M+ + C2H6
19. Field Ionization (FI) Soft Ionization
Emitters of Tungsten wire used on which
microscopic dendrites / emmitters are
formed (by Pyrolysis)
The mechanism of ionisation - when a
molecule is subjected to a very high
electric field, ( > 10*9 volts/metre), a
valence electron tunnels through the
potential barrier and is removed from the
molecule. The resulting ion is therefore a
radical, M+.
20. carbon emitters and silicon emitters.
Silicon emitters are robust, relatively
inexpensive, and they can handle a higher
current for field desorption.
Carbon emitters are more expensive, but
they can provide about an order of
magnitude better sensitivity than silicon
emitters.
22. Desorption Field Ionization
Field desorption ionization are soft
ionization methods that tend to
produce mass spectra with little or no
fragment-ion content.
Benefits
simple mass spectra, typically one
molecular or molecular-like ionic
species per compound.
23. little or no chemical background
works well for small organic molecules,
many organometallics, low molecules -
polymers and some petrochemical
fractions
Limitations
sensitive to alkali metal contamination and
sample overloading
emitter is relatively fragile
relatively slow analysis as the emit
the sample must be thermally volatile
24. Electrospray Ionization
The sample solution is sprayed across a
high potential difference (a few kilovolts)
from a needle into an orifice in the
interface. Heat and gas flows are used to
desolvate the ions existing in the sample
solution.
26. Advantages of ESI
• good for charged, polar or basic
compounds
• permits the detection of high-mass
compounds at mass-to-charge ratios that
are easily
• best method for analyzing multiply
charged compound
• very low chemical background leads to
excellent detection limits
• compatible with MS/MS methods
27. Matrix Assisted Laser Desorption
Ionization (MALDI)
The analyte is dissolved in a solution
containing an excess of a matrix such as
sinapinic acid or dihydroxybenzoic acid
that has a chromophore that absorbs at
the laser wavelength.
28. Matrix Assisted Laser Desorption
Ionization (MALDI)
The matrix absorbs the energy from the
laser pulse and produces a plasma that
results in vaporization and ionization of the
analyte.
30. Advantages of MALDI
rapid and convenient molecular weight
determination
Limitations of MALDI
MS/MS difficult
requires a mass analyzer that is
compatible with pulsed ionization
techniques
not easily compatible with LC/MS
31. Fast Atom Bombardment (FAB)
The analyte is dissolved in a liquid matrix
such as glycerol, thioglycerol, m-
nitrobenzyl alcohol, or diethanolamine and
a small amount (about 1 microliter) is
placed on a target.
32. Fast Atom Bombardment (FAB)
The target is bombarded with a fast atom
beam (for example, 6 keV xenon atoms)
that desorb molecular-like ions and
fragments from the analyte.
Cluster ions from the liquid matrix are also
desorbed and produce a chemical
background that varies with the matrix
used.
35. Mass analyzers / Seperators
1.Sector analysers
Single focusing
Double focusing
2. Quadrupole analyser
Mass filter
Ion trap/ Ion storage
3. Time of Flight (TOF)
4. FT-Ion Cyclotron Resonance (FT-ICR)
36. Mass analyzers / Seperators
1. Sector analysers:
uses an electric and/or magnetic field to affect
the path and/or velocity of the charged particles .
bend the trajectories of the ions as they pass
through the mass analyzer, according to their
mass-to-charge ratios.
deflecting the more charged and faster-moving,
lighter ions more.
38. 1.2 Double Focusing
Mass spectrometer that incorporates a
magnetic sector and an electric sector
connected in series in such a way that
ions with the same m/z but with
distributions in both the direction.
40. 2.1 Quadrupole analyser : Mass filter
A quadrupole mass filter consists of four
parallel metal rods
Two opposite rods have an applied
potential
The applied voltages affect the trajectory
of ions traveling between the four rods.
only ions of a certain mass-to-charge ratio
pass through the quadrupole filter.
42. Quadrupole analyser : Ion Trap
an ion trap uses constant DC and radio
frequency (RF) oscillating AC electric
fields to trap ions.
It is commonly used as a component of
a mass spectrometer.
44. 3. Time Of Flight (TOF)
an ion's mass-to-charge ratio is
determined via a time measurement.
Ions are accelerated by an electric field of
known strength.
This acceleration results in an ion having
the same kinetic energy.
The velocity of the ion depends on the
mass-to-charge ratio.
The time that it takes for the particle to
reach a detector at a known distance is
measured.
46. 3. FT-Ion Cyclotron resonance (FT-ICR)
the mass-to-charge ratio (m/z) of ions
based on the cyclotron frequency of the
ions in a fixed magnetic field.
The ions are trapped in a Penning trap (a
magnetic field with electric trapping plates)
where they are excited by rf
After the excitation field is removed, the
ions are rotating at their cyclotron
frequency in phase (as a "packet" of ions).
47. FT-Ion Cyclotron resonance (FT-ICR)
These ions induce a charge on a pair of
electrodes as the packets of ions pass
close to them.
The resulting signal is called a free
induction decay (FID), transient or
interferogram that consists of a
superposition of sine waves.
The useful signal is extracted from this
data by performing a Fourier transform
50. Tandem Mass Spectroscopy MS-MS
Multiple stages of mass analysis separation
can be accomplished with individual mass
spectrometer.
Elements separated in space or using a
single mass spectrometer with the MS
steps separator.
52. Methods of Ion Detection / Ion
detectiors
Mass analysis - i.e. the separation of
bunches or streams of ions according to
their individual mass-to-charge (m/z) ratio.
The most common types of ion detector
used in modern instruments:
1. The Faraday Cup or Cylinder
2. The Electron Multiplier
3. The Photomultiplier or
Scintillation Counter.
53. 1. The Faraday Cup or Cylinder
The basic principle is that the incident ion
strikes the dynode surface, which emits
electrons and induces a current which is
amplified and recorded.
The dynode electrode is made of a
secondary emitting material like CsSb,
GaP or BeO.
The Faraday cup is very robust.
55. 2. The Electron Multiplier
A Faraday cup uses one dynode, it has
series of dynodes maintained at increasing
potentials resulting in a series of
amplifications.
Their are two types of electron multiplier
57. 3. The Photomultiplier or
Scintillation Counter.
The ions initially strike a dynode which
results in electron emission.
These electrons then strike a phosphorous
screen which in turn releases a burst of
photons.
The photons then pass into the multiplier
where amplification occurs in a cascade
59. Interpretation of MS Spectrum
The mass spectrum produced will usually
be presented as a vertical bar graph, in
which each bar represents an ion having a
specific mass-to-charge ratio (m/z) and the
length of the bar indicates the relative
abundance of the ion.