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Introduction to Pharmaceutical Analytical Chemistry

 

 

STIG PEDERSEN-BJERGAARD

Department of Pharmacy, University of Oslo, Norway and Department of Pharmacy, University of Copenhagen, Denmark

 

BENTE GAMMELGAARD

Department of Pharmacy, University of Copenhagen, Denmark

 

TRINE GRØNHAUG HALVORSEN

Department of Pharmacy, University of Oslo, Norway

 

Second Edition

 

 

 

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Preface to the Second Edition

This textbook is an extensive revision of ‘Introduction to Pharmaceutical Analysis’ from 2012. We have revised the manuscript totally, and updated the content according to current practice in pharmaceutical analytical chemistry, and according to current versions of European and United States Pharmacopeia. Additionally, we have added a new chapter on chemical analysis of biopharmaceuticals, improved the illustrations throughout and provided illustrations in colour. The intention of these efforts has been to provide the reader with a textbook at the level expected in 2018.

We have changed the title to emphasize that this textbook is about analytical chemistry, and that the applications described are all related to pharmaceuticals. However, the philosophy is the same as with the first edition. The textbook is primarily for pharmacy and chemistry students (and other scientists approaching the pharmaceutical sciences) at university level, requesting basic knowledge on chemical analysis of pharmaceutical ingredients and preparations, and chemical analysis of drug substances in biological fluids. In the first part of the textbook, we teach the fundamentals of the main analytical techniques. Compared to textbooks in pure analytical chemistry, we go into less detail but we still teach to a level where the reader can understand the details in current pharmacopeia and bioanalytical methods. The second part of the textbook is unique, as we focus on identification, purity testing and assay of pharmaceutical ingredients, identification and quantitation of active ingredients in pharmaceutical preparations, and identification and quantitation of drugs in biological fluids. Such systematic discussion of pharmaceutical applications is not found in any other textbook on the market.

Originally, this textbook was written in Norwegian by Stig Pedersen‐Bjergaard and Knut Rasmussen. The first Norwegian edition came in 2004 (ISBN 82‐7674‐844‐9), and this was revised in 2010 (ISBN 978‐82‐450‐1013‐8). The manuscript was translated to English and improved by Stig Pedersen‐Bjergaard, Knut Rasmussen, and Steen Honoré Hansen in 2012. Since that first English edition, the author team has changed. Knut Rasmussen has retired and Steen Honoré Hansen passed away in the autumn 2017. Knut is acknowledged for his pioneering work in the period 2004–2012, and for his highly valuable advice during preparation of the current edition. Steen is acknowledged for his work on translation and improvements in preparation of the first English edition of the book, and the valuable discussions of the content and improvements of the present edition until autumn 2017. We also thank our colleagues and students at the University of Oslo and the University of Copenhagen for inspiration, discussions, advice, proof reading, chromatograms, titration curves, and fun.

Oslo/Copenhagen, June 2018

Stig Pedersen‐Bjergaard Bente Gammelgaard Trine Grønhaug Halvorsen

University of Oslo University of Copenhagen University of Oslo

University of Copenhagen

Abbreviations

 

AAS
Atomic absorption spectrometry
ADME
Absorption, distribution, metabolism, excretion
AES
Atomic emission spectrometry
AFID
Alkali flame ionization detector (GC)
APCI
Atmospheric pressure chemical ionization
API
Active pharmaceutical ingredient
ATR
Attenuated total reflectance (IR spectrophotometry)
BP
British pharmacopoeia
CAD
Charge aerosol detector
CE
Capillary electrophoresis
CI
Chemical ionization
CRS
Chemical reference substance
CZE
Capillary zone electrophoresis
DAD
Diode array detector
DNA
Deoxyribonucleic acid
DL
Detection limit
ECD
Electron capture detector
EDL
Electrode‐less discharge lamp
EDTA
Ethylene diamine tetra‐acetic acid
EI
Electron ionization
EIC
Extracted ion chromatogram
ELSD
Evaporative light scattering detector
EMA
European Medicines Agency
EOF
Electro‐osmotic flow
ESI
Electrospray ionization
FDA
Food and Drug Administration (USA)
FID
Flame ionization detector
FTIR
Fourier transform infrared (spectrophotometry)
GC
Gas chromatography
GLP
Good laboratory practice
GMP
Good manufacturing practice
GPC
Gel permeation chromatography
HETP
Height equivalent to theoretical plate
HIC
Hydrophobic interaction chromatography
HILIC
Hydrophilic interaction chromatography
HPLC
High performance liquid chromatography
HR
High resolution (MS)
HVPE
High voltage paper electrophoresis
ICH
International Council for Harmonization (for Technical Requirements for Pharmaceuticals for Human Use)
IEC
Ion exchange chromatography
IEF
Isoelectric focusing
IS
Internal standard
ICP
Inductively coupled plasma (spectrometry)
IR
Infrared
JP
Japanese pharmacopoeia
LC
Liquid chromatography
LLOD
Lower limit of detection (= DL)
LLOQ
Lower limit of quantification (= QL)
LOD
Limit of detection (= DL)
LOQ
Limit of quantitation (= QL)
LLE
Liquid–liquid extraction
MA
Marketing application
MALDI
Matrix assisted laser desorption ionization (MS)
MS
Mass spectrometry
MRM
Multiple reaction monitoring
NDA
New drug application
NIR
Near infrared
NP
Normal phase
NPD
Nitrogen–phosphorous detector (GC)
ODS
Octadecylsilane
OMCL
Official Medicines Control Laboratories
OTC
Over the counter (drugs)
PAT
Process analytical technology
PCHV
Paper chromatography high voltage
PCR
Polymerase chain reaction
PDE
Permitted daily exposure
PE
Polyethylene
PEG
Polyethylene glycol
Ph. Eur.
European Pharmacopoeia
PVC
Polyvinyl chloride
PVDF
Polyvinylidine difluoride
POM
Prescription only medicine (drugs)
PP
Polypropylene
PP
Protein precipitation
PS‐DVB
Polystyrene–divinyl benzene
rDNA
Recombinant DNA
R
Reagent (Ph. Eur.)
RI
Refractive index (detector)
RNA
Ribonucleic acid
RP
Reversed phase
QP
Qualified person
RV
Substance used as primary standard (suffix) in volumetric analysis
RSD
Relative standard deviation
SAX
Strong anion exchanger
SCX
Strong cation exchanger
SDS‐PAGE
Sodium dodecyl sulfate–polyacrylamide gel electrophoresis
SEC
Size exclusion chromatography
SFC
Supercritical fluid chromatography
SD
Standard deviation
SIM
Selected ion monitoring
SLE
Solid–liquid extraction
SOP
Standard operating procedure
SPE
Solid phase extraction
SRM
Selected reaction monitoring
TDM
Therapeutic drug monitoring
TIC
Total ion chromatogram
TID
Thermionic detector
TLC
Thin‐layer chromatography
TOF
Time‐of‐flight
UHPLC
Ultra high performance liquid chromatography
USP
United States Pharmacopoeia
UV‐Vis
Ultraviolet–visible (spectrophotometry)
WADA
World Anti‐Doping Agency
WAX
Weak anion exchanger
WCX
Weak cation exchanger

Symbols and Units

 

The units in the book do not strictly follow the SI units. The units are adjusted to the dimensions in analytical work.

 

Symbol Unit
A Absorbance
A(1%, 1 cm) Specific absorbance
AS Symmetry factor
a Activity
α Relative retention (separation factor)
equation Specific optical rotation (°) degrees
c Concentration g/L, mol/L
d Dextrorotary (optical rotation) ° (degrees)
D Distribution ratio (also named distribution coefficient or partition coefficient)
E Potential V
E Electrical field (CE) V/cm
E0 Standard electrode potential (standard reduction potential) V
ε Molar absorption coefficient cm−1 · mol−1 · L
εo Relative elution strength
η Viscosity cPoise
F Flow rate (chromatography) mL/min
F Fluorescence
h Peak height mm
H Height equivalent to theoretical plate
I Intensity
IA Acid value mg
II Iodine value mg
IOH Hydroxyl value mg
IS Saponification value mg
Ka Acid ionization constant (= acid dissociation constant, acidity constant) M
Kb Base ionization constant (= basicity constant) M
KD Partition ratio (= distribution constant)
Kw Autoprotolysis equilibrium constant of water (= ion product of water) M2
k Retention factor
λ Wavelength nm
L Length m (mm)
l Levorotary (optical rotation) ° (degrees)
μapp Apparent mobility cm2 · min−1 · V−1
μe Electrophoretic mobility cm2 · min−1 · V−1
μeo Electroosmotic mobility cm2 · min−1 · V−1
M Molarity mol /L−1
M Molar mass g/mol
M Molecular mass u = Da
Mr Relative molar mass
N Number of theoretical plates
ν Frequency Hz (s−1)
pI Isoelectric point
P Distribution ratio between 1‐octanol and aqueous solution, pH 7.4
P′ Polarity index
φ Quantum yield (fluorescence)
r Radius m (mm)
Rf Retention factor (TLC)
RS Resolution (chromatography)
ρ Density g/cm3
σ Standard deviation
s Standard deviation
T Temperature K, C
T Transmittance
tR Retention time min
tM Hold‐up time min
t′R Adjusted retention time min
u Linear velocity (flow rate) cm/s
v Velocity m/s
V Volume L, 1 mL = 1 cm3
VM Hold‐up volume (void volume) (LC); total permeation volume (SEC) mL
VO Exclusion volume mL
VR Retention volume mL
W Peak width min
Wh Peak width at half height min
images Mean
z Charge

Constants

Avogadro's number N 6.0221 × 1023 mol−1
Faraday's constant F 9.649 × 104 · C(oulomb) · mol−1 = 96.485 kJ · mol−1
Gas constant R 8.314 J · K−1 · mol−1
Speed of light in vacuum c 2.998 × 108 m/s
Planck's constant h 6.626 × 10−34 J · s
ln(loge) = log10 × 2.303

Greek alphabet

Upper case Lower case Name English
A α Alpha a
B β Beta b
Γ γ Gamma g
Δ δ Delta d
E ɛ Epsilon e
Z ζ Zeta z
H η Eta h
Θ θ Theta th
I ι Iota i
K κ Kappa k
Λ λ Lambda l
M μ Mu m
N ν Nu n
Ξ ξ Xi x
O o Omicron o
Π π Pi p
P ρ Rho r
Σ σ, ς * Sigma s
T τ Tau t
Y υ Upsilon u
Φ φ Phi ph
X χ Chi ch
Ψ ψ Psi ps
Ω ω Omega o