Related Experiment Video
Updated: Feb 3, 2026
08:08
Major Components of the Light Microscope
Published on: July 30, 2008
24.6K
Consistency evaluation between matrix components ratio and microbiological potency of tylosin major components
Khadijeh Hamidian1, Mohsen Amini2, Nasrin Samadi3,4
1Department of Drug and Food Control, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran.
Summary
This study quantifies the potency of tylosin components, revealing varying antibacterial activity. Defining individual limits for tylosin matrix components can enhance potency result accuracy.
Area of Science:
- Pharmaceutical Science
- Microbiology
- Analytical Chemistry
Background:
- Tylosin is a multi-component antibiotic with varying potencies among its matrix components.
- Understanding the quantitative relationship between the content and potency of each tylosin component is crucial for accurate antibiotic characterization.
Purpose of the Study:
- To investigate the relative potencies of tylosin matrix components.
- To establish a quantitative relationship between the content and potency of each tylosin component.
Main Methods:
- Bioassay methods were employed to determine the potencies of tylosin matrix components.
- High-performance liquid chromatography (HPLC) was used to quantify tylosin components (A, B, C, and D).
- Statistical analysis was performed to evaluate the equivalency of theoretical and microbiological potencies.
Main Results:
- Tylosin B content was highest in tylosin phosphate and tartrate (up to 19%).
- Tylosin D content varied significantly (0.03% to 18.73%).
- Different tylosin components exhibited varying antibacterial activity against test organisms, precluding a single biopotency conversion factor.
Conclusions:
- Individual limits for low-activity tylosin components and high-activity components can improve potency result accuracy.
- The differential antibacterial activity of tylosin components necessitates component-specific potency assessments.
Related Concept Videos
01:23Components of Stress
537
Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
Interestingly, the hidden cube faces also experience these stresses, equal and...
537
01:24Components of Language
821
Language, whether spoken, signed, or written, consists of specific components: lexicon and grammar. The lexicon is the vocabulary of a language, comprising its words. Grammar is the set of rules used to convey meaning through the lexicon. For example, English grammar adds “-ed” to most verbs to indicate past tense. Words are formed by combining phonemes, which are the basic sound units of a language. Different languages have different sets of phonemes (e.g., “ah” vs.
821
01:08Vector Algebra: Method of Components
19.5K
It is cumbersome to find the magnitudes of vectors using the parallelogram rule or using the graphical method to perform mathematical operations like addition, subtraction, and multiplication. There are two ways to circumvent this algebraic complexity. One way is to draw the vectors to scale, as in navigation, and read approximate vector lengths and angles (directions) from the graphs. The other way is to use the method of components.
In many applications, the magnitudes and directions of...
In many applications, the magnitudes and directions of...
19.5K
01:23Curvilinear Motion: Rectangular Components
1.3K
Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
As the car advances, its position evolves over time. Quantifying the car's velocity involves computing the...
As the car advances, its position evolves over time. Quantifying the car's velocity involves computing the...
1.3K
01:30Drug Binding to Blood Components
533
When drugs enter systemic circulation, they interact with various components of the blood, including proteins such as human serum albumin (HSA), α1-acid glycoprotein (AAG), lipoproteins, globulins, and red blood cells (RBCs).
HSA is the most abundant plasma protein and is vital in drug binding. It contains distinct drug-binding sites, with different drugs exhibiting affinity for specific sites. There are three main drug-binding domains for HSA: sites I, II, and III. These domains are...
HSA is the most abundant plasma protein and is vital in drug binding. It contains distinct drug-binding sites, with different drugs exhibiting affinity for specific sites. There are three main drug-binding domains for HSA: sites I, II, and III. These domains are...
533
01:29Electron Transport Chain Components
996
The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
996