Electron Spray Ionization (ESI) and its Applications
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The document discusses electrospray ionization (ESI) and its application in mass spectrometry, an analytical technique used to measure the mass-to-charge ratio of ions generated from samples. ESI enables the analysis of high molecular weight biomolecules by converting samples into ionized droplets, which are then analyzed for their characteristics and structure. It highlights the uses of mass spectrometry in identifying compounds, determining their structure, and applications in various fields like pharmacokinetics and space exploration.
Electron Spray Ionization (ESI) and its Applications
- 1. ELECTRONSPRAY IONIZATION(ESI) AND ITS APPLICATION Presented by:- Shaikh Nisar Ali (M.Pharm) Dept. Of Pharmacology Guided by:- Dr. PSS
- 2. Mass Spectroscopy:- • Mass spectrometry is an analytical tool useful for measuring the mass-to-charge ratio of one or more molecules present in a sample. • Every Mass Spectrometer consists of at least these three components: 1. Ionization Source 2. Mass Analyzer 3. Ion Detection System
- 3. Basics... • Organic Molecules are bombarded with beam of Energetic electrons (70 ev) in gaseous state. • Converted into highly energetic positively charged ions.(Molecular ion or Parent ion) • Further breakup into smaller ions.(Fragmented or daughter ions). • The formed ions are separated by deflection in Magnetic field according to their MASS and CHARGE.
- 6. • Electrospray Ionization • Electrospray ionization (ESI) is a technique to generate ions for mass spectrometry using electrospray by applying a high voltage to a liquid to produce an aerosol. • Is a type of evaporative Ionization technique used to analyze the high Molecular weight biomolecules Labile and Non Volatile compound. • Due to Electron Spray Ionization (ESI) technique mass Spectroscopy becomes very popular and generally coupled with Chromatography.
- 7. ESI Method
- 8. • A solution containing the sample molecule is sprayed through the high voltage potential capillary by the help of nebulization gas. • The sample comes to capillary tube and due to the nebulizing gas the sample will be converted into sprayed droplets. • And here we are supplying power. • Due to the power supply here high voltage potential will be generated at the tip of the capillary. • Due to the high voltage potential that droplets becomes ionized. • In next step the droplets comes to ionisation chamber and this chamber is operated at normal atmospheric pressure. • In this ionization chamber we are supplying heated dissolution gas that is heated Nitrogen gas and due to that temperature of the chamber becomes high.
- 9. • And at high temperature the sample is removed from the analyte due to due to evaporation and it will converted in the form of Molecular Ion. • Heated desolvation gas will evaporate the solvent and it will produce the molecular ion. • For example --- If we have the molecule M and it is surrounded by the Solvent S and this Solvent is Ionised like MSH+ • Now due to this heated dissolvation gas – Temp∆ Rises – And evaporation takes place and it will converted into MH+ • Now this molecular Ion will go further towards ION accelerator chamber and then to mass analyser.
- 10. Power is supplied. Positive side is attached to capillary tube. Negative side is attached to Ion accelerator chamber and it will produce negative potential. That negative potential will help this positive Ion to get the velocity and ultimately it will move towards the mass analyzer. It can also produce multiple charged ions along with the single charged ions.
- 11. Uses :- • Mass spectra is used in two general ways. • 1. To prove the identity of two compounds. • 2. To establish the structure of a new compound. • It deals with the examination of the characteristics fragments (ions) arising from the breakdown of organic molecules. • Used to Ionised Proteins , Lipids , Olegosacchrides , Olegonucleotides, Synthetic Polymer etc.
- 12. • It helps to establish the structure of a new compound in several ways 1. It can give the exact molecular mass. 2. It can give a molecular formula or it can reveal the presence of certain structural units in a molecule. • Trace gas analysis, respired gas monitors . • Determining the isotopic compounds of elements within a sample . • Pharmacokinetics, protein characterization. • Glycan analysis and space exploration.
- 13. Applications:- • It has both quantitative and qualitative uses. • Helps in identification of unknown compounds. • Determining the isotopic composition of elements in a molecule. Quantifying the amount of compound in the sample. • Determining the structure of a compound by observing fragmentation. • Mass spectroscopy is now in very common use in analytical laboratories that study physical, chemical or biological properties of a great variety of compounds.
- 14. Thank you