1. X-ray diffraction is used to study the interaction between drugs and polymers by analyzing their crystal structures. It works by detecting the interference pattern of X-rays scattered by the regular atomic structure of a crystal.
2. Key mechanisms of drug release from polymers include diffusion, degradation, and swelling followed by diffusion. Drug-polymer compatibility is important and can be studied using techniques like X-ray diffraction.
3. X-ray diffraction provides information on a material's unit cell dimensions, degree of crystallinity, and particle size by analyzing the diffraction pattern produced when X-rays interact with a crystal's atomic planes.
Types of crystals & Application of x raykajal pradhan
some basic information:-
A crystal lattice is a 3-D arrangement of unit cells.
Unit cell is the smallest unit of a crystal, By stacking identical unit cells, the entire lattice can be constructed
A crystal’s unit cell dimensions are defined by six numbers, the lengths of the 3 axes, a, b, and c, and the three interaxial angles, α, β and γ.
If a unit cell has the same type of atom at the corners of the unit cell but not also in the middle of the faces nor in the centre of the cell, it is called primitive and given by symbol P
7 types of crystal system details
14 bravis lattice
APPLICATION X-RAY CRYSTALLOGRAPHY
1. Structure of crystals
2. Polymer characterisation
3. State of anneal in metals
4. Particle size determination
a) Spot counting method
b) Broadening of diffraction lines
c) Low-angle scattering
5.Applications of diffraction methods to complexes
a) Determination of cis- trans isomerism
b) Determination of linkage isomerism
6.Miscellaneous applications
X ray, invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visible light. The wavelength range for X rays is from about 10-8 m to about 10-11 m, the corresponding frequency range is from about 3 × 1016 Hz to about 3 × 1019 Hz.
X-raydiffraction has a very significant role in crystal determination.. specially in the field of Pharmaceutical analysis.
It contains the requirement for M.pharm 1st year according to RGUHS syllabus.
Types of crystals & Application of x raykajal pradhan
some basic information:-
A crystal lattice is a 3-D arrangement of unit cells.
Unit cell is the smallest unit of a crystal, By stacking identical unit cells, the entire lattice can be constructed
A crystal’s unit cell dimensions are defined by six numbers, the lengths of the 3 axes, a, b, and c, and the three interaxial angles, α, β and γ.
If a unit cell has the same type of atom at the corners of the unit cell but not also in the middle of the faces nor in the centre of the cell, it is called primitive and given by symbol P
7 types of crystal system details
14 bravis lattice
APPLICATION X-RAY CRYSTALLOGRAPHY
1. Structure of crystals
2. Polymer characterisation
3. State of anneal in metals
4. Particle size determination
a) Spot counting method
b) Broadening of diffraction lines
c) Low-angle scattering
5.Applications of diffraction methods to complexes
a) Determination of cis- trans isomerism
b) Determination of linkage isomerism
6.Miscellaneous applications
X ray, invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visible light. The wavelength range for X rays is from about 10-8 m to about 10-11 m, the corresponding frequency range is from about 3 × 1016 Hz to about 3 × 1019 Hz.
X-raydiffraction has a very significant role in crystal determination.. specially in the field of Pharmaceutical analysis.
It contains the requirement for M.pharm 1st year according to RGUHS syllabus.
X- Rays were discovered by Wilhelm Roentgen, so x-rays are also called Roentgen rays.
X-ray diffraction in crystals was discovered by Max von Laue. The wavelength range is 10-7 to about 10-15 m.
The penetrating power of x-rays depends on energy-
Hard x-rays: High frequency & More energy
Soft x-rays: Less penetrating & Low energy
X-rays are short-wavelength electromagnetic radiations produced by the deceleration of high energy electrons or by electronic transitions of electrons in the inner orbital of atoms.
X-ray region- 0.1-100 A˚
Analytical purpose- 0.7-2 A˚
Properties: Highly penetrating invisible rays
Liberate minute amounts of heat on passing through matter
Not deflected by electric and magnetic fields
Poly energetic, having widespread energies and wavelengths
Cause ionization (adding or removing electrons in atoms and molecules)
Transmitted by (pass-through) healthy body tissue
Principle: X-ray diffraction is based on constructive interference of monochromatic x-rays and a crystalline sample.
The interaction of incident rays with the sample produces constructive interference when conditions satisfy Bragg’s law.
Production of x rays: X- Rays are generated when the high velocity of electrons impinge on a metal target.
1% of total energy of the electron beam is converted into X –radiation.
X- Rays were discovered by Wilhelm Roentgen, so x-rays are also called Roentgen rays.
X-ray diffraction in crystals was discovered by Max von Laue. The wavelength range is 10-7 to about 10-15 m.
The penetrating power of x-rays depends on energy-
Hard x-rays: High frequency & More energy
Soft x-rays: Less penetrating & Low energy
X-rays are short-wavelength electromagnetic radiations produced by the deceleration of high energy electrons or by electronic transitions of electrons in the inner orbital of atoms.
X-ray region- 0.1-100 A˚
Analytical purpose- 0.7-2 A˚
Properties: Highly penetrating invisible rays
Liberate minute amounts of heat on passing through matter
Not deflected by electric and magnetic fields
Poly energetic, having widespread energies and wavelengths
Cause ionization (adding or removing electrons in atoms and molecules)
Transmitted by (pass-through) healthy body tissue
Principle: X-ray diffraction is based on constructive interference of monochromatic x-rays and a crystalline sample.
The interaction of incident rays with the sample produces constructive interference when conditions satisfy Bragg’s law.
Production of x rays: X- Rays are generated when the high velocity of electrons impinge on a metal target.
1% of total energy of the electron beam is converted into X –radiation.
X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal. From this electron density, the mean positions of the atoms in the crystal can be determined, as well as their chemical bonds, their crystallographic disorder, and various other information.
CHARACTERIZATION OF CRYSTALLINE AND PARTIALLY CRYSTALLINE SOLIDS BY X-RAY POWDER DIFFRACTION (XRPD)
USP <941>
Every crystalline phase of a given substance produces a characteristic X-ray diffraction pattern.
Diffraction patterns can be obtained from a randomly oriented crystalline powder composed of crystallites (crystalline regions within a particle) or crystal fragments of finite size.
Essentially three types of information can be derived from a powder diffraction pattern:
The angular position of diffraction lines (depending on geometry and size of the unit cell).
The intensities of diffraction lines (depending mainly on atom type and arrangement and preferred orientation within the sample.
Diffraction line profiles (depending on instrumental resolution, crystallite size, strain, and specimen thickness).
Introduction
Definition
History
Principle
Instrumentation
Methods
Applications
Advantages
Limitation
Conclusion
References
X-ray diffraction (XRD) is one of the most important non-destructive tools to analyze all kinds of matter—ranging from fluids, to powders and crystals. From research to production and engineering, XRD is an indispensable method for materials characterization and quality control.
X-ray diffraction techniques are used for the identification of crystalline phases of various materials and the quantitative phase analysis subsequent to the identification.
X-ray diffraction techniques are superior in elucidating the three-dimensional atomic structure of crystalline solids.
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1. 1
Presented by-
Venkatesh G
M.Pharm (Pharmaceutics)
1st Semester ( 2020-22)
Sri Venkateswara University Tirupati
SVUniversity College of Pharmaceutical Sciences
Drug-Polymer
Compatibility
Study By XRD
2. 1. Introduction
2. Drug-polymer Interaction
3. Criteria followed in polymer Selection
4. Mechanism of Drug release from the Polymer
5. X-Ray Diffraction
6. Principle
7. Mechanism of X-Ray Diffraction
8. Applications
9. Biological Evolution
CONTENT
2
3. Polymers are long chain
organic molecules
assembled from many
smaller molecules called
as monomers.
Role of Polymers-
In Manufacturing
of vials, syringes,
catheter's.
In Manufacturing of
drug Formulations.
Improve bioavailability of
drug
INTRODUCTION
3
Pharmaceutical
Polymers-
4. Drug substances are usually in intimate contact with polymers.
DRUG - POLYMER
4
INTERACTION
The molecular interactions between drugs and polymers in drug loaded polymer
micelles does not extend much beyond concepts such as “like-dissolves-like“ or
hydrophilic/hydrophobic. However, polymer-drug compatibility strongly affects
formulation properties and therefore the translation of a formulation into the
clinics. Specific interactions such as hydrogen-bonding, π-π stacking or
coordination interactions can be utilized to increase drug-loading. This is
commonly based on trial-and-error and eventually leads to an optimized drug
carrier.
5. It must be soluble and easy to synthesize; must have a finite molecular wt.
Should provide drug attachment and release sites for drug polymer linkages
Should be compatible with biological environment, i.e. non- toxic and non-
antigenic
Helps to avoid surprise problem during formulation process
Should be biodegradable or be eliminated from body after its
function is over.
5
Criteria Followed in Polymer Selection
6. MECHANISM OF DRUG RELEASE
FROM POLYMER & INTERACTION
6
⚫There are three primary mechanisms by which active agents can be
released from adelivery system: namely,
⚫Diffusion, degradation, and swelling followed by diffusion
⚫Anyorall of these mechanisms mayoccur in agiven releasesystem
⚫Diffusion occurs when a drug or other active agent passes through
the polymer that forms thecontrolled- release device.
⚫The diffusion can occur on a macroscopic scale as through pores in
the polymer matrix or on a molecular level, by passing between
polymerchains
7. Drug delivery from typical reservoir
devices: (a) implantable or oral
systems, and (b) transdermal systems.
8. X – RAY
8
DIFFRACTION
Contd….
X-Ray Diffraction is a Phenomenon
in which the atoms of a crystal, by
virtue of their uniform spacing, cause
an interference pattern of the waves
present in an incident beam of X-
Ray.
(or)
The atomic planes of a crystal cause
an incident beam of X-Rays to
interfere with one another as they
leave the crystal. The phenomenon is
called X-Ray Diffraction.
9. 9
PRINCIPLE
X-ray diffraction is based on constructive interference of
monochromatic x-rays and a crystalline sample. These x-rays
are generated by a cathode ray tube, filtered to produce
monochromatic radiation ,collimated to concentrate and
directed towards the sample. The interaction of incident rays
with the sample produces constructive interference when
conditions satisfy Bragg’s law.
10. 10
Bragg’s Law
Bragg’s Law States that the
“Constructive interference of the
reflected beams emerging from
two different planes will take
place if the path lengths of two
rays is equal to whole number of
wavelengths”.
• The path difference between ray 1 and
ray 2 = 2d Sinθ
• For constructive interference: nλ = 2d
Sinθ This is called Bragg’s Equation.
11. Mechanism of X-Ray Diffraction
X-RAY DIFFRACTION METHODS :
These are generally used for investigating the internal structures and
crystal structures of various solid compounds. They are :
4. Powder method
3. Rotating crystal method
2. Bragg’s X-ray spectrometer method
1. Laue’s photographic method : a) Transmission method
b) Back reflection method
12. 12
In the transmission Laue method, the film is placed
behind the crystal to record beams which are transmitted
through the crystal.
One side of the cone of Laue reflections is defined by
the transmitted beam. The film intersects the cone,
with the diffraction spots generally lying on an ellipse.
Can be used to orient crystals for solid state
experiments.
Most suitable for the investigation of preferred
orientation sheet particularly confined to lower
diffraction angles.
Also used in determination of symmetry of single
crystals.
1. Laue’s photographic method
a) Transmission method
:
13. 13
Contd….
b) Back Reflection Method :
In the back-reflection method, the film is placed
between the x-ray source and the crystal. The
beams which are diffracted in a backward
direction are recorded.
One side of the cone of Laue reflections is
defined by the transmitted beam. The film
intersects the cone, with the diffraction spots
generally lying on an hyperbola.
This method is similar to Transmission method
however, black-reflection is the only method for
the study of large and thick specimens.
Disadvantage: Big crystals are required
14. 14
Crystal orientation is determined from the position of the spots.
Each spot can be indexed, i.e. attributed to a particular plane,
using special charts.
The Greninger chart is used for back-reflection patterns and the
Leonhardt chart for transmission patterns.
The Laue technique can also be used to assess crystal perfection
from the size and shape
15. 15
Laue-beam of x-ray-crystal-emitted x-ray obtained on photographic plate-using
photograph-brag analysed structures of crystals of Nacl, Kcl, and Zns -brags
equation.
Single plane generates several diffraction lines-sum total of diffraction lines gives
diffraction patterns-from the pattern we can deduce different distances between
planes-angle between planes in each of three dimensions.
2) The Bragg’s x-ray spectrometer method:
16. 16
A-anti cathode
B-B’ – Adjustable slits
C-crystal
E-ionization chamber
One plate of ionization chamber is connected to the positive terminal of a H.T
Battery , while negative terminal is connected to quadrant electrometer (measures
the strength of ionization current)
17. 17
Crystal is mounted such that ѳ=0° and ionization chamber is adjusted to
receive x-rays.
Crystal and ionization chamber are allowed to move in small steps.
The angle through which the chamber is moved is twice the angle through
which the crystal is rotated
X-ray spectrum is obtained by plotting a graph between ionization current and
the glancing angle ѳ
Peaks are obtained. peaks corresponds to Bragg’s reflection
Different order glancing angles are obtained with known values of d and n and
from the observed value of ѳ , λ can be measured.
Contd….
Working :
18. X-Rays falls on crystal surface
The crystal is rotated and x-rays are made to reflect from various lattice
planes
The intense reflections are measured by bragg’s spectrometer and the
glancing angles for each reflection is recorded
Then on applying bragg’s equation, ratio of lattice spacing for various
groups of planes can be obtained.
Ratio’s will be different for different crystals
Experimentally observed ratio’s are compared with the calculated ratio’s,
particular structure may be identified
19. 19
3) ROTATING CRYSTAL METHOD:
In this method series of complete revolutions occur.
Each set of a plane in a crystal diffracts four times during rotation.
Four diffracted beams are distributed into a rectangular pattern in the central point
of photograph.
1. Complete rotation method :
20. 20
The crystal is oscillated at an angle of 15° or 20°
The photographic plate is also moved back and
forth with the crystal
The position of the spot on the plate indicates the
orientation of the crystal at which the spot was
formed
2. Oscillation method :
21. 21
4) POWDER CRYSTAL METHOD:
X-ray powder diffraction (XRD) is a rapid analytical technique primarily used
for phase identification of a crystalline material and can provide information on
unit cell dimensions. The analyzed material is finely ground, homogenized, and
average bulk composition is determined. Fine powder is struck on a hair with a
gum, it is suspended vertically in the axis of a cylindrical camera.
22. 22
When monochromatic beam is allowed to pass different possibilities may
happen
1. There will be some particles out of random orientation of small
crystals in the fine powder
2. Another fraction of grains will have another set of planes in the
correct positions for the reflections to occur
3. Reflections are possible in different orders for each set
If the angle of incidence is ѳ then the angle of reflection will be 2ѳ If the
radius is r the circumference 2πr corresponds to a scattering angle of 360°
Ѳ=360*1/πr
From the above equation the value of ѳ can be calculated and substituted in
bragg’s equation to get the value of d
23. APPLICATIONS
23
1. Structure of crystals :
a) X-Ray pattern of salt Nacl
b) X-Ray pattern of salt Kcl
c) X-Ray pattern of mixture of Nacl & Kcl
d) X-Ray pattern of a powder mixed crystal
of Nacl & Kcl
2) Polymer characterisation :
Determine degree of crystanillity.
Non-crystalline portion scatters x-ray beam to give a continuous background
(amorphous materials)
Crystalline portion causes diffraction lines that are not continuous. (crystalline
materials)
24. 24
3) Particle size determination :
Spot counting method: v=V.δθ.cosθ/2n
v = volume of individual crystallite
V = total volume irradiated
N = no. of spots in diffraction ring
δθ = divergence of x-ray beam
Biological Evolution :
Biological Compatibility : Should be Non-Toxic
Should be taste less
Should be odour less
Should be Non-Irritating
Should be Insoluble in saliva