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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_5733_Библиотеки_им_академика_М_И_Перельмана
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Pharmacological Action: The pharmacological action of Diethylthiambutene
primarily involves its interaction with opioid receptors in the central nervous
system. Diethylthiambutene helps relieve pain by binding to mu-opioid receptors,
reducing pain perception.
Analysis:
Physical methods:
Appearance Test: The appearance test involves observing the physical
characteristics of a substance. It includes- State, Colour, Texture, etc.
Melting Point Test: The melting point of a substance is the temperature at
which it changes from a solid to a liquid. Load a small amount of the
sample into a capillary tube. Place the capillary tube in a melting point
apparatus. Gradually heat the sample while observing it through a
viewfinder. Note the temperature range over which the substance melts.
Boiling Point Test: The boiling point is the temperature at which a liquid
changes into a vapor. Heat the sample in a suitable container. Observe the
temperature at which vapor starts forming. Note the boiling point range.
Solubility Test: Dissolve a small amount of Diethylthiambutene in different
solvents (e.g., water, ethanol, chloroform). Note its solubility in each
solvent.
Differential Scanning Calorimetry (DSC): It is a thermoanalytical technique
used to study the thermal behavior of materials in Diethylthiambutene. In
DSC, the difference in the amount of heat required to increase the
temperature of a sample and a reference material is measured as a
function of temperature.
Chemical Methods:
Gas Chromatography (GC): Gas chromatography is a widely used
technique for separating and analyzing volatile compounds.
Diethylthiambutene can be separated from other compounds in a mixture
based on differences in their partitioning between a stationary phase and
a mobile phase. The separated compounds can then be detected using
techniques such as mass spectrometry (GC-MS) for identification and
quantification.
High-Performance Liquid Chromatography (HPLC): Like GC, HPLC is a
powerful technique for separating and analyzing compounds in a mixture.
In HPLC, the separation is based on differences in the interaction of the
analyte with a stationary phase and a mobile phase. Detection can be done
using UV-Vis spectroscopy or mass spectrometry (HPLC-MS).
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Mass Spectrometry (MS): Mass spectrometry is often used in conjunction
with chromatographic techniques for the identification and quantification
of diethylthiambutene. MS provides information about the molecular
weight and structural characteristics of the compound, aiding in its
identification.
Nuclear Magnetic Resonance (NMR) Spectroscopy: NMR spectroscopy can
provide structural information about diethylthiambutene by analyzing the
interactions of its nuclei with an external magnetic field. This technique is
useful for confirming the structure of the compound and can be used
alongside other analytical methods.
Immunoassays: Immunoassays involve the use of antibodies to selectively
bind to diethylthiambutene or its metabolites, allowing for their detection
and quantification. While less common than chromatographic techniques,
immunoassays can be rapid and sensitive methods for screening
diethylthiambutene in biological samples.
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DIOXAPHETYL BUTYRATE
Scientific name: 1,3-Dioxolane-2-carboxylic acid 2-ethyl-4-methylphenyl ester.
Molecular Structure:
Physical properties
Appearance: White crystalline solid
Colour: White
Odour: Odourless
Taste: Tasteless
Melting point: 54-56°C
Boiling point: 250-260°C
Solubility: More soluble in water.
Molar mass: 236.27 g/mol
Chemical properties
Chemical Formula: C13H16O4
Chemical classification: It is a synthetic organic compound belonging to
the class of esters.
Functional groups: Ester group and Ether group.
PH: 7.5
How it is obtained?: It is an opioid analgesic derived from diphenylacetic acid.
Route of administration: Oral
Pharmacological Action: The pharmacological action of dioxaphetyl butyrate is
primarily attributed to its sedative and hypnotic properties. It acts on the central
nervous system by enhancing the activity of the neurotransmitter gamma-
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aminobutyric acid (GABA), which is an inhibitory neurotransmitter. By increasing
the activity of GABA, dioxaphetyl butyrate suppresses the excitability of neurons in
the brain, leading to sedation, relaxation, and sleep induction.
Analysis:
Physical Methods:
Melting Point Determination: Melting point determination involves
measuring the temperature at which a solid substance melts. This can
provide valuable information about the purity and identity of dioxaphetyl
butyrate, as impurities or different compounds may alter its melting point.
Boiling Point Determination: Boiling point determination is used to
identify the temperature at which a substance changes from liquid to gas
phase. While dioxaphetyl butyrate is typically administered as a solid or in
solution form, boiling point determination can still be useful for certain
analytical purposes.
Solubility Studies: Studies involve investigating the solubility of
dioxaphetyl butyrate in various solvents over a range of temperatures.
This information can be helpful for formulation purposes and to
understand the compound's behavior in different environments.
Density Measurement: Density measurement involves determining the
mass of a given volume of dioxaphetyl butyrate. This can provide
information about its physical state (solid, liquid, or gas) and purity, as
impurities may affect its density.
X-ray Diffraction (XRD): XRD is a technique used to analyze the crystal
structure of solid substances. By exposing a sample of dioxaphetyl
butyrate to X-rays and analyzing the diffraction pattern produced,
information about its crystal structure and purity can be obtained.
Chemical Methods:
High-Performance Liquid Chromatography (HPLC): HPLC is a powerful
technique used to separate, identify, and quantify components in a
mixture. It can be coupled with various detectors such as UV-Vis or mass
spectrometry to analyze dioxaphetyl butyrate in pharmaceutical
formulations or biological samples.
Gas Chromatography (GC): GC is another chromatographic technique used
for the separation and analysis of volatile compounds. Dioxaphetyl
butyrate can be derivatized to enhance its volatility for GC analysis. Flame
ionization detection (FID) or mass spectrometry (MS) are commonly used
detectors for GC analysis.
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Mass Spectrometry (MS): MS is a sensitive technique used to identify and
quantify compounds based on their mass-to-charge ratio. It can be
coupled with chromatographic techniques such as HPLC or GC to analyze
dioxaphetyl butyrate and its metabolites in complex matrices.
Elemental Analysis: Elemental analysis techniques such as atomic
absorption spectroscopy (AAS) or inductively coupled plasma mass
spectrometry (ICP-MS) can be used to determine the elemental
composition of dioxaphetyl butyrate and detect impurities or
contaminants.
Nuclear Magnetic Resonance (NMR) Spectroscopy: NMR spectroscopy is
particularly useful for structural elucidation. It can provide information
about the connectivity of atoms in a molecule, aiding in the identification
and characterization of dioxaphetyl butyrate.
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DIPHENOXYLATE
Scientific Name:
diphenoxylate is (2R)-2-({(2R)-2-(dimethylamino)-1-phenylpropan-2-yl}oxy)-2-
ethylbutanamide.
Molecular Structure:
Physical properties
Appearance: Tablets or capsules
Colour: White
Odour: Odourless
Taste: Bitter
Melting point: 135-140°C
Boiling point: if it subjected to boiling, it would likely decompose rather
than boil due to its chemical structure.
Solubility: Sparingly soluble in water, acetone R and ethanol (~750 g/l)
Molar mass: 452.64 g/mol
Chemical properties
Chemical Formula: C30H32N2O2
Chemical classification: Diphenoxylate is classified as a synthetic opioid
analgesic. It is chemically related to the opioid agonist meperidine but is
primarily used as an antidiarrheal agent due to its effects on slowing
gastrointestinal motility.
Functional groups: Ether group, Amide group, Aromatic ring.
PH: 7.2
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How it is obtained? : The process involves combining a precursor
of normethadone with norpethidine.
Route of administration: Oral
Pharmacological Action: Diphenoxylate acts by slowing intestinal contractions,
which helps manage diarrhea. However, to prevent abuse, it is combined with a
subtherapeutic dose of atropine.
Analysis:
Physical Methods:
Melting Point Determination: Diphenoxylate has a known melting point,
and comparing the observed melting point to the literature value can
confirm its identity and purity. Impurities or different forms of the
compound may cause deviations from the expected melting point.
Solubility Analysis: Determining the solubility of diphenoxylate in various
solvents at different temperatures can provide valuable information about
its physical properties. This can help in formulation development and
understanding its behavior in different media.
Crystallization Studies: Observing the crystallization behavior of
diphenoxylate from different solvents or solvent mixtures can yield
insights into its crystal forms, purity, and potential polymorphism.
Techniques such as hot-stage microscopy can be used to monitor
crystallization processes in real-time.
Particle Size Analysis: Particle size distribution analysis using techniques
like laser diffraction or microscopy can provide information about the
physical characteristics of diphenoxylate particles. This information is
crucial for formulation development and assessing the bioavailability of
the drug.
Density Measurement: Determining the density of diphenoxylate can be
useful for quality control purposes and understanding its physical
properties. Density measurements can be performed using various
methods such as pycnometry or densitometry.
Chemical Methods:
Gas Chromatography (GC): While less common for diphenoxylate analysis
due to its polar nature, GC can still be used after derivatization to improve
volatility. It separates compounds based on their volatility and interaction
with a stationary phase.
Ultraviolet-Visible Spectroscopy (UV-Vis): This technique measures the
absorption of light by a substance in the UV or visible region.
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Diphenoxylate may have characteristic absorption bands that can be used
for quantitative analysis.
Infrared Spectroscopy (IR): IR spectroscopy measures the absorption of
infrared radiation by molecules. It can provide information about
functional groups present in diphenoxylate, aiding in its identification.
Nuclear Magnetic Resonance Spectroscopy (NMR): NMR can provide
structural information about diphenoxylate by analyzing the interactions
of atomic nuclei with an applied magnetic field. It's particularly useful for
confirming the chemical structure and purity.
Mass Spectrometry (MS): MS can be coupled with chromatographic
techniques like HPLC or GC for identification and quantification of
diphenoxylate. It ionizes molecules and separates them based on their
mass-to-charge ratio, providing highly specific information about the
compound.
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DIPIPANONE
Scientific name: 4,4-Diphenyl-6-(1-piperidinyl)-heptan-3-one.
Molecular Structure:
Physical properties
Appearance: Crystalline
Colour: White
Odour: Odourless
Taste: Bitter
Melting point: 147-150°C
Boiling point: It tends to decompose before reaching its boiling point
under standard atmospheric conditions
Solubility: More soluble in water
Molar mass: 323.52 g/mol
Chemical properties
Chemical Formula: C22H29NO
Chemical classification: Dipipanone is classified as a synthetic opioid
analgesic.
Functional groups: Ketone group, Phenyl group, Amine group.
PH: 7.5
How it is obtained?: The synthesis of dipipanone usually involves the reaction of
precursor compounds to form the desired product. The key steps often include the
formation of the piperidine ring and the introduction of the phenyl groups,
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followed by the addition of the ketone functionality. The final product is then
purified through various methods to obtain the desired purity and form.
Route of administration: Oral
Pharmacological Action: The pharmacological action of dipipanone primarily
involves its interaction with opioid receptors in the central nervous system. It
exerts its analgesic effect primarily by binding to mu-opioid receptors in the brain
and spinal cord. By activating these receptors, dipipanone inhibits the
transmission of pain signals, resulting in pain relief.
Analysis:
Physical Methods:
Melting Point Determination: This method involves heating a sample of
the substance and observing the temperature at which it changes from a
solid to a liquid. The melting point is a characteristic property that can
help identify and assess the purity of a compound.
Boiling Point Determination: Similar to melting point determination,
boiling point determination involves heating a sample to observe the
temperature at which it changes from a liquid to a gas. The boiling point
can provide information about the volatility and purity of a substance.
Density Measurement: Density is a physical property that relates the mass
of a substance to its volume. Various methods, such as pycnometry or
densitometry, can be used to measure the density of a substance. Density
measurements can provide information about the purity and
concentration of a compound.
Particle Size Analysis: Particle size distribution analysis using techniques
like laser diffraction or microscopy can provide information about the
physical characteristics of particles in a substance. Particle size analysis is
important for understanding the behavior of powders and suspensions in
various applications.
X-Ray Diffraction (XRD): XRD is a technique used to analyze the crystalline
structure of a substance. By measuring the diffraction pattern of X-rays as
they interact with the atomic arrangement of a sample, XRD can provide
information about crystal structure and phase composition.
Chemical Methods:
Nuclear Magnetic Resonance (NMR) Spectroscopy: NMR spectroscopy can
provide structural information about dipipanone by analyzing the
interactions of atomic nuclei with an applied magnetic field. By
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