The document describes the Kjeldahl method for determining the amount of nitrogen in organic compounds. The method involves three main steps: digestion, neutralization, and titration. In digestion, the food sample is heated with sulfuric acid to convert nitrogen into ammonia. Neutralization makes the solution alkaline to release ammonia gas. Titration then estimates the nitrogen content by reacting the ammonia with boric acid and titrating with acid, where the volume needed is equivalent to the original nitrogen amount. The percentage of nitrogen and protein in the sample can then be calculated.
Total Nitrogen Determination - Traditional and Modern MethodsKasun Prabhashwara
This slideshow contains a short overview of importance of total nitrogen determination, traditional Kjeldahl method, its improvements and Dumas method of total nitrogen determination.
In this presentation I have mentioned whatever the possible relevant content is required for this method
Citation Is done at the end of slide.
Content is up to date & true to my belief.
Thanks & Best Regards.
Anurag Pandey
B.Pharm (FACULTY OF PHARMACY, INVERTIS UNIVERSITY)
M.Pharm (INSTITUTE OF PHARMACY, NIRMA UNIVERSITY)
Email :- anurag.dmk05@gmail.com
Total Nitrogen Determination - Traditional and Modern MethodsKasun Prabhashwara
This slideshow contains a short overview of importance of total nitrogen determination, traditional Kjeldahl method, its improvements and Dumas method of total nitrogen determination.
In this presentation I have mentioned whatever the possible relevant content is required for this method
Citation Is done at the end of slide.
Content is up to date & true to my belief.
Thanks & Best Regards.
Anurag Pandey
B.Pharm (FACULTY OF PHARMACY, INVERTIS UNIVERSITY)
M.Pharm (INSTITUTE OF PHARMACY, NIRMA UNIVERSITY)
Email :- anurag.dmk05@gmail.com
This presentation explores a new method of measuring total nitrogen (TN) using a TOC analyzer. Techniques, benefits and results are discussed. For more information, visit ssi.shimadzu.com. Thanks for viewing.
Biomass gasification is a chemical process that convert
biomass into useful convenient gaseous fuel. It has emerged as a promising technology to fulfill the increasing energy demands of the world as well as to reduce significantly the volume of Biomass waste generated in developing societies.
Gasification produce gases like CO,CO2, H2 and CH4; these gas released are called Syngas.
Gasification technology can be used for:
Household Fuel
Electricity and Steam Generation
In internal combustion engines as a fuel
In a gasifier, the biomass undergoes several different processes like drying, pyrolysis, combustion and gasification process
Study of the Sulfur Trioxide Generation Mechanism and Control Method Using We...inventionjournals
In coal fired power plant, especially using sulfur content fossil fuels, much attention in recently paid to sulfur trioxide and sulfuric acid mist emission, because conventional desulfurization system should not be removed, which is installed to meet air quality standard for sulfur dioxide. Sulfur trioxide is highly reactive with water vapor and generally convert to sulfuric acid mist in atmosphere. Sulfuric acid is very fine under-submicron sized particulate matter or droplets. Recently sulfur trioxide cause air pollution and public health, discussion comes out, especially in the United States and Japan, that regulations and guideline should be enlarge the sulfur dioxide to sulfur trioxide and sulfuric acid. Moreover most countries reinforce sulfur oxides emission regulations or guidelines from coal-fired power plant. In this study, focusing that how to control the sulfur trioxide and sulfuric acid mist. Sulfuric acid mist found depending on the flue gas temperature. Generation and conversion rate of sulfur trioxide were measured according to temperature. The absorbent was selected to remove sulfur trioxide and sulfuric acid using wet type desulfurization system which the most proven technology at this moment.
Processing of Hydrogen Sulfide & Carbon Dioxide From Natural Gas StreamsMohamed Almoalem
This poster was presented in GPA (Gas Processors Association) 23rd technical conference in November 2015. It is the outcome of an individual research that was done voluntarily by me during my internship in Tatweer Petroleum.
Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment St...Michael Hewitt, GISP
Jon Smoyer P.G., PA Department of Environmental Protection (DEP), “Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment Strategy”
Hydrogen Peroxide has been used to oxidize and remove ferrous iron from mine drainage for decades. It is a relatively inexpensive and effective oxidant that can be used to achieve rapid ferrous iron oxidation in many active and semi-passive mine drainage treatment systems. This presentation outlines the physical properties, concentrations, and available delivery options for hydrogen peroxide.
This presentation explores a new method of measuring total nitrogen (TN) using a TOC analyzer. Techniques, benefits and results are discussed. For more information, visit ssi.shimadzu.com. Thanks for viewing.
Biomass gasification is a chemical process that convert
biomass into useful convenient gaseous fuel. It has emerged as a promising technology to fulfill the increasing energy demands of the world as well as to reduce significantly the volume of Biomass waste generated in developing societies.
Gasification produce gases like CO,CO2, H2 and CH4; these gas released are called Syngas.
Gasification technology can be used for:
Household Fuel
Electricity and Steam Generation
In internal combustion engines as a fuel
In a gasifier, the biomass undergoes several different processes like drying, pyrolysis, combustion and gasification process
Study of the Sulfur Trioxide Generation Mechanism and Control Method Using We...inventionjournals
In coal fired power plant, especially using sulfur content fossil fuels, much attention in recently paid to sulfur trioxide and sulfuric acid mist emission, because conventional desulfurization system should not be removed, which is installed to meet air quality standard for sulfur dioxide. Sulfur trioxide is highly reactive with water vapor and generally convert to sulfuric acid mist in atmosphere. Sulfuric acid is very fine under-submicron sized particulate matter or droplets. Recently sulfur trioxide cause air pollution and public health, discussion comes out, especially in the United States and Japan, that regulations and guideline should be enlarge the sulfur dioxide to sulfur trioxide and sulfuric acid. Moreover most countries reinforce sulfur oxides emission regulations or guidelines from coal-fired power plant. In this study, focusing that how to control the sulfur trioxide and sulfuric acid mist. Sulfuric acid mist found depending on the flue gas temperature. Generation and conversion rate of sulfur trioxide were measured according to temperature. The absorbent was selected to remove sulfur trioxide and sulfuric acid using wet type desulfurization system which the most proven technology at this moment.
Processing of Hydrogen Sulfide & Carbon Dioxide From Natural Gas StreamsMohamed Almoalem
This poster was presented in GPA (Gas Processors Association) 23rd technical conference in November 2015. It is the outcome of an individual research that was done voluntarily by me during my internship in Tatweer Petroleum.
Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment St...Michael Hewitt, GISP
Jon Smoyer P.G., PA Department of Environmental Protection (DEP), “Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment Strategy”
Hydrogen Peroxide has been used to oxidize and remove ferrous iron from mine drainage for decades. It is a relatively inexpensive and effective oxidant that can be used to achieve rapid ferrous iron oxidation in many active and semi-passive mine drainage treatment systems. This presentation outlines the physical properties, concentrations, and available delivery options for hydrogen peroxide.
The most frequently used methods for measuring protein content in foods include the Kjeldahl method, Dumas method, direct measurement methods using UV-spectroscopy and refractive index measurement. Each method has advantages and disadvantages
Roti Bank Hyderabad: A Beacon of Hope and NourishmentRoti Bank
One of the top cities of India, Hyderabad is the capital of Telangana and home to some of the biggest companies. But the other aspect of the city is a huge chunk of population that is even deprived of the food and shelter. There are many people in Hyderabad that are not having access to
At Taste Of Middle East, we believe that food is not just about satisfying hunger, it's about experiencing different cultures and traditions. Our restaurant concept is based on selecting famous dishes from Iran, Turkey, Afghanistan, and other Arabic countries to give our customers an authentic taste of the Middle East
Ang Chong Yi Navigating Singaporean Flavors: A Journey from Cultural Heritage...Ang Chong Yi
In the heart of Singapore, where tradition meets modernity, He embarks on a culinary adventure that transcends borders. His mission? Ang Chong Yi Exploring the Cultural Heritage and Identity in Singaporean Cuisine. To explore the rich tapestry of flavours that define Singaporean cuisine while embracing innovative plant-based approaches. Join us as we follow his footsteps through bustling markets, hidden hawker stalls, and vibrant street corners.
2. Johan Gustav Christoffer
Thorsager Kjeldahl, was a Danish
chemist who developed a method
for determining the amount of
nitrogen in certain organic
compounds using a laboratory
technique which was named the
Kjeldahl method
3. INTRODUCTION
• A food is digested with a strong acid so that it releases nitrogen
which can be determined by a suitable titration technique. The
amount of protein present is then calculated from the nitrogen
concentration of the food.
• The same basic approach is still used today, although a number
of improvements have been made to speed up the process and
to obtain more accurate measurements. It is usually considered
to be the standard method of determining protein
concentration.
• The Kjeldahl method can conveniently be divided into three
steps: digestion, neutralization and titration.
6. DIGESTION
• The food sample to be analyzed is weighed into a digestion
flask and then digested by heating it in the presence of
sulfuric acid (an oxidizing agent which digests the food),
anhydrous sodium sulfate (to speed up the reaction by raising
the boiling point) and a catalyst, such as copper, selenium,
titanium, or mercury (to speed up the reaction).
• Digestion converts any nitrogen in the food (other than that
which is in the form of nitrates or nitrites) into ammonia,
and other organic matter to C02 and H20. Ammonia gas is not
liberated in an acid solution because the ammonia is in the
form of the ammonium ion (NH4
+) which binds to the sulfate
ion (SO4
2-) and thus remains in solution:
• N(food) ® (NH4)2SO4 3
7. NEUTRALIZATION
• After the digestion has been completed the digestion flask
is connected to a recieving flask by a tube. The solution in
the digestion flask is then made alkaline by addition of
sodium hydroxide, which converts the ammonium sulfate
into ammonia gas:
• (NH4)2SO4 + 2 NaOH 2NH3 + 2H2O + Na2SO4 (2)
• The ammonia gas that is formed is liberated from the
solution and moves out of the digestion flask and into the
receiving flask - which contains an excess of boric acid.
The low pH of the solution in the receiving flask converts
the ammonia gas into the ammonium ion, and
simultaneously converts the boric acid to the borate ion:
• NH3 + H3BO3 (boric acid) NH4
+ + H2BO3
- (borate ion)
8. TITRATION
• The nitrogen content is then estimated by
titration of the ammonium borate formed with
standard sulfuric or hydrochloric acid, using a
suitable indicator to determine the end-point of
the reaction.
• H2BO3
- + H+ H3BO3
9. CALCULATION
The concentration of hydrogen ions (in moles) required to reach
the end-point is equivalent to the concentration of nitrogen that
was in the original food (Equation 3). The following equation can
be used to determine the nitrogen concentration of a sample that
weighs m grams using a xM HCl acid solution for the titration
10. CALCULATION
• Where vs and vb are the titration volumes of the
sample and blank, and 14g is the molecular
weight of nitrogen N. A blank sample is usually
ran at the same time as the material being
analyzed to take into account any residual
nitrogen which may be in the reagents used to
carry out the analysis. Once the nitrogen content
has been determined it is converted to a protein
content using the appropriate conversion factor:
%Protein = F� %N.