Biotechnology uses microorganisms in various industries including cheesemaking. The cheesemaking process involves pasteurizing milk to kill harmful bacteria, coagulating the milk using starter cultures or rennet to separate curds and whey, and aging the curds to develop flavor and texture through the action of bacteria, fungi, and yeasts. Microorganisms play a key role at each step of cheesemaking and determine the characteristics of the final cheese product.
How Kefir, also known as 'Dairy Champagne' produced? What distinguishes it from curd or yoghurt? What marks its significance in the European countries? Answer all your queries from this presentation.
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Food Technology Micro-organisms in Food ProductionMyt12
Power point aimed at students taking A2 Food Technology focusing on micro-organisms in food production - from healthy bacteria in yoghurt and cheese to food poisoning bacteria. A short focus on Mycoprotein is also included.
This lecture is about microbiology of dairy products presented by Rufia Abbas, she is from Karachi, Sindh Pakistan.
for video: https://youtu.be/WLzFKnSSLTk
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Use of Microorganisms in Food production.
types of micro-organisms in food production.
what is fungi?what is algae?What is fermented food?Examples of fermented foods . Function of bacteria in food production. Function of yeast in production of fermented foods. Cheese. How cheese is made?Process of cheese making .Ripen of cheese. Yogurt. How Yogurt is made . Fermented vegetables. Fermented meat. Yeast bread . Beer and Wine. Food with probiotics.
This presentation involves with the fermented products of dairy items and their manufacturing procedures. This presentation includes production of cheese, buttermilk, yoghurt, kefir and sour cream
Fermented milk products, also known as cultured dairy foods, cultured dairy products, or cultured milk products, are dairy foods that have been fermented with lactic acid bacteria.
This particular presentation describes all the fermented milk products like yoghurt, cheese etc. VIEW, SHARE, ENJOY!
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2. What is Biotechnology?
Biotechnological process
is one that uses
microorganisms in
various branches of
industry, agriculture and
medicine.
3. Outline of cheesemaking proces
The basic source for cheesemaking is milk obtained from
cows, goats, sheep etc.
There are the main stages cheesemaking:
1.Pasteurisation
2. Coagulation -separating the milk into solid curds
3.Maturing of cheese
Microorganisms are used in each step of this
process and determine the flavor and texture of the
final cheese
4. The 1st step of cheesemaking –
pasteurisation
The milk is contaminated with bacteria such as E. coli,
Salmonella, Listeria that are dangerous for human
Pasteurisation is the process of heating up milk and
cooling it back down in an effort to minimize the bacterial
risk of that product.
The key to pasteurisation is to heat the milk to 72 degrees
for no more than 15 seconds and then quickly cooling it to
4°C.
.
5. The second and the main step of
cheese making– Coagulation
Cheesemaking involves separating the milk into solid
curds and liquid whey by coagulating the casein
protein in milk. Acidifying (souring) milk helps to
separate the curds. For this purpose the lactic acid
bacteria is added.
Curds and whey
6. Bacteria acidify milk
Acidifying (souring) milk helps to separate the curds
and whey and control the growth of undesirable
bacteria in cheese.
Usually special ‘starter’ bacteria are added to milk
to start the cheesemaking process. These bacteria
convert the lactose (milk sugar) to lactic acid and
lower the milk’s pH.
7. Starter bacteria and type of cheese
Now it is important how we are going to produce cheese.
Now, depending on the type of cheese are added to the
corresponding lactic acid bacteria.
There are two types of bacteria used for this process:
Mesophilic bacteria thrive at room temperature but die at
higher temperatures. They are used to make mellow
cheeses, such as Cheddar, Gouda and Colby.
Thermophilic bacteria thrive at higher temperatures,
around 55 °C, and are used to make sharper cheeses such
as Gruyère, Parmesan and Romano.
8. Why are there holes in cheese ?
Starter bacteria produce lactic acid, as well as aromatic
compounds and carbon dioxide, which is responsible for the
formation of cheeses mesh
9. Enzymes speed up coagulation
Some cheeses are curdled only by acidity. For example,
paneer cheese is made using lemon juice to curdle the
milk and cottage cheese is made using mesophilic
bacteria. However, for most cheeses, rennet
(podpuszczka) is also added to the milk after a starter
bacteria.
Rennet is a mixture containing the active enzyme
chymosin. Rennet speeds up the coagulation of casein and
produces a stronger curd. It also allows curdling at a
lower acidity, which is important for some types of cheese.
Rennet is an extract from a calf’s stomach. It nowadays
can be synthetically made
10. The 3rd step of cheesemaking –
maturing of cheese. Further action of
bacteria
As cheese matures, bacteria break down
the proteins, altering the flavour and
texture of the final cheese. The proteins
first break into medium-sized pieces
(peptides) and then into smaller pieces
(amino acids).
11. Other microorganisms in
cheesemaking- fungus and yeats
During maturing, some cheeses are inoculated with a
fungus such as Penicillium.
Inoculation can be either on the surface (for example, with
Camembert and Brie) or internally (for example, with blue
vein cheeses). During ripening, the fungi produce
digestive enzymes, which break down large protein
molecules in the cheese. This makes the cheese softer,
runny and even blue.