The document discusses various fragmentation patterns seen in mass spectrometry for different functional groups. For alcohols, cleavage of the carbon-carbon bond adjacent to the oxygen is common, as is loss of a water molecule. Aromatic ethers often fragment through cleavage of the carbon-oxygen bond or rearrangement within the aromatic ring. Carboxylic acids may lose a hydroxyl group or carboxyl group through cleavage of bonds adjacent to the carbonyl. The presence of halides is indicated by isotopic peaks from chlorine or bromine atoms.
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
In 1945 Robert Burns Woodward gave certain rules for correlating λmax with molecular structure. In 1959 Louis Frederick Fieser modified these rules with more experimental data, and the modified rule is known as Woodward-Fieser Rules
Introduction to Spectroscopy,
Introduction to UV, electronic transitions, terminology, chromophore, Auxochrome, Examples and Applications.
Introduction to IR, Fundamental vibrations, Types of Vibrations, Factors affecting the vibrational freaquencies, Group frequencies, examples and applications.
Ion exclusion chromatography is a technique,introduced by Wheaton and Bauman, used to separate ionic compounds from non-ionic compounds and to separate mixtures of acids.
In 1945 Robert Burns Woodward gave certain rules for correlating λmax with molecular structure. In 1959 Louis Frederick Fieser modified these rules with more experimental data, and the modified rule is known as Woodward-Fieser Rules
Introduction to Spectroscopy,
Introduction to UV, electronic transitions, terminology, chromophore, Auxochrome, Examples and Applications.
Introduction to IR, Fundamental vibrations, Types of Vibrations, Factors affecting the vibrational freaquencies, Group frequencies, examples and applications.
Ion exclusion chromatography is a technique,introduced by Wheaton and Bauman, used to separate ionic compounds from non-ionic compounds and to separate mixtures of acids.
This power point was prepared based on Introduction to Spectroscopy by L. Pavia, Gary M. Lampman, and George S. Kriz. The language of this power point is Persian.
Postsecondary lesson for pre-u students or form 6th students on mole concept, stoichiometry, limiting reagent, spectrometry and percent yield and percent purity.
A mass spectrum (MS) is a graphical representation of the relative abundance of ions at different mass-to-charge ratios (m/z) in a sample. Mass spectrometry is a powerful analytical technique used to identify and characterize the chemical composition of a wide range of substances, including organic compounds, proteins, peptides, and even small molecules. Here's how a typical mass spectrum is generated and what it can tell you:
Ionization: In mass spectrometry, the sample is first ionized, meaning that the atoms or molecules are converted into ions (charged particles). Common ionization methods include electron impact, electrospray ionization, and matrix-assisted laser desorption/ionization (MALDI).
Mass-to-Charge Ratio (m/z): After ionization, the ions are separated based on their mass-to-charge ratio (m/z). This ratio is a dimensionless quantity, and it represents the mass of the ion (in atomic mass units, amu) divided by its charge (in elementary charge units, e).
Ion Separation: The ions are separated by a mass analyzer, such as a magnetic sector, time-of-flight (TOF), quadrupole, or ion trap, depending on the specific instrument used. The mass analyzer sorts ions according to their m/z values.
Detector: As the ions exit the mass analyzer, they are detected, and their abundance is recorded. The detector measures the number of ions at each m/z value.
Data Output: The data from the detector is then used to create a mass spectrum. The x-axis of the mass spectrum represents m/z values, while the y-axis represents the relative abundance or intensity of ions at each m/z value.
A typical mass spectrum might have peaks at specific m/z values, and these peaks can provide valuable information about the sample:
Base Peak: The peak with the highest intensity in the spectrum is called the base peak. It represents the most abundant ion.
Molecular Ion Peak: The peak at the highest m/z value (farthest to the right) often represents the molecular ion, which can provide insight into the molecular weight of the compound.
Fragment Peaks: Peaks at lower m/z values are often fragment ions resulting from the breaking of chemical bonds within the original ions. These fragment ions can provide information about the structure of the compound.
Isotopic Peaks: Some elements have natural isotopes, and their presence can result in multiple peaks with slightly different m/z values. These isotopic peaks can also provide information about the composition of the sample.
Interpreting a mass spectrum involves analyzing the positions and intensities of these peaks to identify the compound and its structure. Mass spectrometry is widely used in various fields, including chemistry, biochemistry, environmental science, and forensic analysis, for tasks such as identifying unknown substances, quantifying the amounts of specific compounds, and studying chemical reactions.
Alkanes are organic compounds that consist entirely of single-bonded carbon and hydrogen atoms and lack any other functional groups. Alkanes have the general formula CnH2n+2 and can be subdivided into the following three groups: the linear straight-chain alkanes, branched alkanes, and cycloalkanes.
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These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
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Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
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TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
2. INTERPRETATION
* Mass of M+•- most abundant isotope masses of each element in
the molecule
* MS have unit mass resolution-atomic mass- nominal mass
* M+•-identified as the ion with highest m/z ratio
* But with caution- may be an impurity/ an isotope of M+•
* Many compounds- no M+• - Low energy EI or CI for confirmn.
* Base peak- Ion with greatest abundance-need not be M+•
* Mass Spectrum- finger print of molecular structure
* Computer data bases can be used to identify unknown compounds
3. Characteristics of Molecular Ions
* Most compounds have an even molecular mass-exception is ‘N’ rule
* Nitrogen rule: Compound with an odd number of ‘N’ –odd M +•
* Compounds with even or zero number –even molecular mass
* CH4 (16), NH3 (17), C9H7N (129), N2H4 (32), C27H46O (386)
* Nitrogen- odd valence and even mass
•M +•, the next highest mass fragment-loss of a neutral fragment
•Look for the ratio of M+. to M+2 peak- 3:1-Cl and 1:1 -Br
4. M- Ion
1 H
3-14 None
15 CH3
16 O, NH2
17 OH, NH3
18 H2O
21-25 None
26 C2H4
Reasonable Losses due to Fragmentation
6. m/z 57 (100), m/z 43 (2), m/z 42 (2), m/z 41 (50),
m/z 29 (45)
CH3CH=CH-NH2 (M+. m/z 57)
m/z 42 (M-CH3); m/z 41 (M-NH2); m/z 43 (-14 units)
Loss of CH2 is rare and unlikely- so m/z 57 is not M+.
It may be fragment ion- CH3-C(CH3)3
+.
7. Natural Abundances of the Isotopes
C13, N15, S33- contribute to M+1; O18, S34 Cl35, Br81to M+2
CH4, M+1, 1.1%; C2H6- 2.2%
8. Mass and Relative Abundance of Organic
Elements
Elements containing only one isotopic form :
Element Mass
H(A) 1
F(A) 19
Elements containing two isotopic forms :
Element Mass % Abundance Mass % Abundance
C (A + 1) 12 100 13 1.10
O (A + 2) 16 100 18 0.20
Elements containing three isotopic forms :
Element Mass % Abundance Mass % Abundance Mass %
Abundance
S (A + 2) 32 100 33 0.80 34
4.4
Si (A + 2) 28 100 29 5.10 30
3.4
9.
10.
Molecular Formula from Mass
Spectra
Inferences from graph :
m/z Relative abundance
(x) (y)
64 100.0
65 0.9
66 5.0
With the error limits,
m/z Relative abundance
(x) (y)
64 100.0
65 0.9 ± 0.20
66 5.0 ± 0.50
m/z Relative abundance S O2
64 100.0 100.0 100.0
65 0.9 ± 0.20 0.8 0.08
66 5.0 ± 0.5 4.4 0.4
Conclusions :
Presence of an sulfur atom and O2 due to (A+2) pattern and from the peaks in
the corresponding spectra.
13. Mass spectral reactions:
Unimolecular, competitive and consecutive
Ions with wide range of internal energy
ABCD + e- ABCD +• + 2e
ABCD + e- A +• + BCD•
AB+ + CD• A+ + B
AB• + CD+ C+ + D (I)
AD+ + BC• (II)
ABCD +• + ABCD [ ABCD ABCD ]+ ABCDA+(III)
“Cool ions” appear as M +•
(I) Simple cleavages
(II) Rearrangements
(III) ion-molecule reactions
MS FRAGMENTATION OF HYPOTHETICAL MOLECULE
14. Abundance of ions depends on:
Stability of the +ve charge in the cation or +.
ion stabilization- e- sharing –hetero atoms nonbonding
orbital CH3-C + =O CH3-CO +
Resonance stabilization:CH2=CH-CH2
+ +CH2-CH=CH2
Stability of radical or neutral species
Steric arrangements of atoms or groups of atoms-
favoring Rearrangements
Stevenson Rule: ABCD+. A + + BCD• or A . + BCD+
Radical of high IE, Ion of low IE
Loss of largest alkyl group-most abundance ion-exception
C2H5CH(CH3)-C4H9
+ [C2H5CH(CH3)+] >[CH(CH3)-C4H9
+ ]
> [C2H5CH-C4H9
+] > [C2H5C(CH3)-C4H9
+ ]
15.
---- C – C ---- ---- C
+ . C ----+
---- C – Z ---- ---- C
+ . Z ----+
At heteroatom
+ .
+ .
a to heteroatom
---- C - C – Z ---- C=Z
+ ---- C
.
+
+ .
---- C - C – Z ---- Z
+ . ---- C = C
+
+ .
Fragmentation process
Cleavage of s
bond
16.
+
.
---- HC – C – Z ---- ---- C=C
+ HZ
+
Retro Diels-alder
+ .
CH2
CH2
CH2
CH2
+
+ . + .
McLafferty
Z
H
Z R
CH2
CH2
Z
H
Z R
+
.
Fragmentation process
Cleavage of 2 s bond (rearrangements)
17.
R
R
CH+ < C+
R
R
R
R
R”
CH
R’
Loss of Largest Subst. Is most favored
Alkanes
Intensity of M.+ is Larger for linear chain than for
branched compound
Intensity of M.+ decrease with Increasing M.W.
(fatty acid is an exception)
Cleavage is favored at branching
reflecting the Increased stability of the ion
Stability order: CH3
+ < R-CH2
+ <
18. Molecular ion peaks are present, possibly with low intensity. The
fragmentation pattern contains clusters of peaks 14 mass units apart
(which represent loss of (CH2)nCH3).
Alkane
32.
R CH2 CH2 Y R
x
CH2 Y R
+
CH2
+
Y R
x
R2
C
R1
O
C
R1
O
+
C
+
R1
O
- [RCH2]
- [R2]
larger
C-C Next to Heteroatom cleave leaving
the charge on the Heteroatom
33. Esters lose a molecule of acid- similar to loss of H2O from alcs.
Deuterium expts- ‘H’ comes from -position
When -H not available- a ketene is eliminated
Rearrangement reactions in OMS involve ‘H’ atom transfer
35. McLafferty Rearrangement: Involves -H migration to a d.b-6TS
Requires- multiple bond. C=O, C=C, C=S, C=N, CC, CN and a -H
Interatomic distance of 1.8 A between -H and acceptor
Enol form is retained before
fragmentation
36. Neutral species like H2O, NH3, ROH etc.-eliminated from ortho
Disubstituted aromatic compounds- Ortho effect
Differentiation of Ortho- from meta- and para- isomers
37.
38.
-Et
-29
Most intense peaks are often:
m/z 41, 55, 69
Double Bond Stabilize M+
Double Bond favor
Allylic cleavage
CH2 CH CH+ Et
EtMe
+CH2 CH CH
EtMe
CH2 CH CH +
EtMe
M+ = 112 m/z = 83
40. Alcohol
An alcohol's molecular ion is small or non-existent. Cleavage of the
C-C bond next to the oxygen usually occurs. A loss of H2O may
occur as in the spectra below.
41. 16
Mass Spectral Cleavage Reactions
of Alcohols
Alcohols undergo a-cleavage (at the bond next to the
C-OH) as well as loss of H-OH to give C=C
45. H3C CH
NH2
CH2
NH2
m/z30m/z44
3:1
H3C C
OH
CH2
NH2
CH3
m/z59 m/z30
2:1
H3C C
OH
CH2
NH2
CH3
m/z58 m/z31
17:1
C6H5 CH2 CH2 OH
91 31
15:1
C6H5 CH2 CH2 NH2
91 30
1:10
CH3 C CH2
CH3
CH3
OH
57 31
3:1
R CH2
OH
CH2
+
OH
+.
R CH2
NH2
CH2
NH2
+
+.
m/z 31 m/z 30
R CH R
OH
CH
+
R'
OH
m/z 30+R'
' "'R C R'
OH
R"
-R"' C R'
OH
R"
+
m/z 29+R'+R"
+.
C
R
X
+ C
R
X
+R C
X
R R
.
:
+
X= N,S,O,cl
46. Molecular ion is prominent
1)
Cleavage in of aromatic ring
Rearrangement
2)
x
O
R
O
+
C5H5
-CO
m/z 93 m/z 65
O
H
- CH2=CH2 x
O
H
H
x
O
H
H
m/z 94
- R
Aromatic Ether
47.
• +
B
CH3 —CH2 —O—CH2 —CH2 —CH2 —CH3 CH3 —CH2 —O+ =CH2
CH3 —CH2 —O —CH2
+
Cleavage of C-C next to Oxygen
Loss of biggest fragment
m/z 59
Aliphatic Ether
48. m/z 73
m/z 45
B
CH3 —CH2—CH —O —CH2 —CH3
CH3
CH =O+ —CH2
CH3
H— CH2
Box rearr.
CH =O+ H
CH3
1- Cleavage of C-C next to Oxygen
m/z 73
m/z 45
M·+
2- Cleavage of C-O bond: charge on alkyl
Ether
Rearrangemen
t
50. Aldehyde
Cleavage of bonds next to the aldehyde group results in the loss of
hydrogen (molecular ion less 1) or the loss of CHO.
Major fragmentation peaks result from cleavage of the C-C bonds adjacent
to the carbonyl
Ketone
51. Carboxylic Acid
In short chain acids, peaks due to the loss of OH (molecular ion less 17)
and COOH (molecular ion less 45) are prominent due to cleavage of bonds
next to C=O.
Ester
Fragments appear due to bond cleavage next to C=O (alkoxy group
loss, -OR) and hydrogen rearrangements
52. Amide
Primary amides show a base peak due to the McLafferty rearrangement
Amine
Molecular ion peak is an
odd number. Alpha-
cleavage dominates
aliphatic amines.
The base peak is
from the C-C
cleavage adjacent
to the C-N bond.
53. Halide
The presence of chlorine or bromine atoms is usually recognizable from
isotopic peaks