Friday, August 30, 2024

Understanding A1 and A2 Milk: FSSAI's Advisory and Its Withdrawal

Introduction

The Food Safety and Standards Authority of India (FSSAI) recently made headlines when it issued an advisory on August 21, directing Food Business Operators (FBOs) not to market milk and milk products under the labels "A1" and "A2." However, just five days later, on August 26, FSSAI withdrew this advisory, citing the need for further consultation and engagement with stakeholders. This sequence of events has sparked considerable discussion about the differences between A1 and A2 milk, the rationale behind FSSAI's advisory, and why it was eventually rescinded.


What Are A1 and A2 Milk?

The difference between A1 and A2 milk lies in the type of beta-casein protein they contain. Cow's milk is composed of various proteins, with caseins making up over 80% of the total protein content. Among these, beta-caseins are the second largest component. The A1 and A2 variants of beta-casein differ slightly in their amino acid sequences. A1 beta-casein contains histidine, an amino acid associated with the body's response to inflammation and allergies, while A2 beta-casein contains proline, which is important for collagen production and joint health.

Milk from different cow breeds contains varying amounts of A1 and A2 beta-caseins. A2 milk, which contains only A2 beta-casein, is often marketed as a healthier option and is sold at a premium price. Despite these claims, there is no scientific consensus on whether A2 milk is superior to regular milk. While some studies suggest that A2 milk may be easier to digest and could potentially reduce the risk of certain health conditions, most of this research is based on in vitro and animal studies with limited human trials.


Why Did FSSAI Issue the Advisory?

FSSAI's advisory on August 21 was not based on the lack of scientific evidence regarding the benefits of A2 milk. Instead, it was related to regulatory standards. According to the Food Safety and Standards (Food Product Standards and Food Additives) Regulations, 2011, there is no official recognition or differentiation of milk based on A1 or A2 beta-casein. As such, FSSAI directed all food business operators, including e-commerce platforms, to remove any claims related to A1 and A2 proteins from their product labels.


Why Was the Advisory Withdrawn?

The withdrawal of the advisory was largely influenced by criticism and feedback from various stakeholders, including government officials. A significant factor was a letter from Venugopal Badaravada, a member of the Indian Council of Agricultural Research (ICAR) governing council, to the Prime Minister. In his letter, Badaravada argued that the decision to ban the marketing of A1 and A2 milk went against global trends in countries like the USA, Australia, New Zealand, and Brazil, where the two types of milk are marketed separately due to potential differences in digestion.

Given the growing criticism and the need for a more nuanced understanding of the issue, FSSAI decided to withdraw the advisory for further consultation and engagement with stakeholders.


Conclusion

The brief episode surrounding the FSSAI advisory on A1 and A2 milk highlights the complexities involved in regulating food products and the importance of balancing scientific evidence with regulatory standards and consumer interests. As the debate over A1 and A2 milk continues, it is essential for regulatory bodies, scientists, and industry stakeholders to work together to ensure that consumers receive accurate information and that their health and safety are prioritized.

Monday, July 24, 2023

Questions for Revision Steam Generators or Boilers

 Steam Generators and Boiler

Explain the term Boiler Draught.

Why draught is essential in boilers?

What is the classification of draught?

Define natural and artificial draught.

Explain the function of chimney.

Mention the advantages and disadvantages of mechanical draught.

Write the difference between forced draught and induced draught.

What do you understand by the term balanced draught?

Mention the advantages and disadvantages of steam jet draught.

What are the advantages of artificial draught over natural draught?

Mention the various draught losses in boiler.

Derive the equation to determine the height of chimney for a given natural draught.

Write the formula for determination of diameter of chimney.

Derive the equation for efficiency of chimney.

What is the power required to drive fan in case of mechanical draught?

What is the disadvantage of natural draught?

It has less life

It has more maintenance cost

The available draught decrease with increasing outside temp

All of the above

The natural draught in the steam generator depends upon

The air condition outside the chimney

The temperature of exhaust gases

Both a & b

none

How is the natural draught produced for exhaust gases?

By using fan

By using chimney

By using gravity

none

The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called

Chimney draught

Induced steam jet draught

Forced steam jet draught

none

The natural draught is produced by

Chimney

Centrifugal fan

Steam jet

None

Efficiency of very tall chimney will be ______.

Power of induced draught fan is greater than power of forced draught fan. True or False.

Natural draught is directly proportional to the _______.

Natural draught is created at the cost of ________.

In the induced steam jet, Kinetic head of steam is high but static head is low. True or False.

Total static draught required for artificial draught is _______.

Maximum draught is produced by the chimney is ________.

Steam jet draught is produced by using a ___________ velocity of jet steam.


Important Points for Objective Market Milk

 Market Milk Important Points

Preheating refers to heating milk before operation.

The milk is preheated for efficient filtration and clarification.

As the temperature of the milk increases, the viscosity of milk decreases and more efficient filtration/clarification result.

The usual temp of preheating --------35-40

Equipment used for preheating--------Plate or Tubular heater.

To improve aesthetic quality of milk by removing visible foreign matter.

Two types of filters--------------1. cold filter 2. warm filter.

Milk is received in plant; it is chilled to 5 or below and stored cool till used.

Internal tubular cooler consists of stainless-steel tube about 2.5-5.0 cm. in diameter.

Cooling efficiency of internal tubular cooler is lower than plate cooler.

Insulator or refrigerated storage tanks-----5-7.5 cm of insulating material bent inner and outer lining; the space bent two lining is used for circulation of the cooling medium.

The term pasteurization has been coined after name of Louis Pasteur of France.

Pasteurization of milk first attributed to Dr. Soxhelt of Germany in 1886.

In Pasteurization destruction of 85-99% of spoilage organism.

Pasteurized milk will not clot with rennet.

Emerging Index organism for Pasteurization---------Listeria Monocytogens, Coxiella Brunetti

The cream line to cream volume is reduced progressively with increase in the temperature time of heating.

Which test is used to detect inadequate pasteurization-----Phosphates Test

Pasteurization temp of in-bottled pasteurization-----63-66 for 30 min.

Advantage of in-bottled pasteurization-----Prevent possibility of post pasteurization contamination.

As vat heating/cooling is rather slow and involves too much agitation causing churning and impairment of creaming properties, these operation can be efficient carried out by plate or tubular heat exchanger.

HTST pasteurization was first developed by A.P.V.Co. In the United Kingdom in1 992.

Sequence of HTST pasteurization system-----Balance tank>Pump>regenerative heating>regenerative cooling>cooling by chill water or brine.

Function of FCBT----maintain a constant head of milk for feeding the raw milk pump:also receive any sub temp milk diverted by FDV.

In HTST pump is fitted between-------- Regenerator and heater.

The PHE is also called Para flow.

Space between PHE plates--------3 mm

Normal pressure maintain in the HTST system are: Pasteurized milk—15psi Raw Milk---14 psi, Heating cooling medium----12-13 psi

The holding time is calculated between-----the point at which the heated milk is leave the heating section and reaches the FDV.

Which method is used for the determination of holding time----electrical conductivity method, the dye injection method, the electronic timer method.

Vacuum pasteurization/Vacreation----Pasteurization of milk/cream under reduced pressure by direct steam.

Vacreation process was first developed in New Zealand by M/s Murray Deodorizers Ltd.

Vacreation was designed to removed Feed and other volatile flavours from cream and pasteurized it for butter making

Stassanization is carried out in a tubular heat exchanger consisting of three concentric tubes.

Stassanization was first invented in France by Henri Stassano.

What is the principle behind the Stassanization-----Heating of milk to the desired temp by passing it between two water heated pipes through the narrow space of 0.6-0.8 mm.

Heating temp in Stassanization-----74 for 7 sec.

Ultra-high Tem Pasteurization----was developed in 1 950s.

Temp/time combine in ultra-high temp past-----1 35-1 50 (275-302 F) c for no hold.

Uperization this is itself a shortened form of the word Ultra Pasteurization’.

In Uperization the milk is heated with direct steam up to 1 50 (302 F) for fraction of second. It is continuous process.

Nitric acid may be used in not more than 1 % for stainless steel surfaces. 

Ex of polyphosphates and chelating chemicals------------------ Tetra phosphates, hexametaphosphates, tripolyphosphates, pyrophosphates.

Surface active agents-------Teepol, Acinol-N, Idet-1 0, common soaps

Commonly used dairy sanitizers are-----steam, hot water, and chemicals (QAC, idophor)

The method of sanitization broadly consists of ---- flushing, spraying, brushing, fogging, sub immersion.

Who invented the Toned Milk----Dr. D.N khurody (India) first produced in 1946 in central Dairy of Aarey milk colony.


Sunday, July 23, 2023

Revision questions of Physical Chemistry of Milk

Lesson-1

  1. What is the range of casein in milk?
  2. Name the minor constituents present in milk.
  3. Give the brief explanation of major constituents of milk.
  4. Casein content is low in _____ milk.
  5. Presence of long chain ______ fatty acids reduce the _____ point of milk fat.
  6. Lactose is a ______ sugar and is present in ____ state.
  7. Lactose is a disaccharide of ____ and ____.
  8. ____ is a first carbon source for the microbe gaining entry in milk.
  9. Why cow milk is golden yellow in colour?
  10. Milk is a good source of which vitamin?

Lesson-2

  1. Define colloid.
  2. What is the size range of colloids?
  3. Write difference between lyophilic and lyophobic.
  4. Mention some differences between true solution and colloidal solution.
  5. ________ colloids are thermodynamically stable.

Lesson-3

  1. Write a short note on milk as a colloidal system.
  2. Approximate size range of colloidal state is ______ nm.
  3. Milk is a pure colloidal system. True or False.
  4. Milk is a heterogenous fluid. True or False.
  5. Hydrophilic colloids are thermodynamically stable. True or False.
  6. Explain the term Oswald’s ripening.
  7. Write the properties of colloidal system.

Lesson-4

  1. Define emulsion and give some examples.
  2. What is emulsification?
  3. What are the factors which influence the properties of emulsion?
  4. What are the types of emulsion? Explain it with suitable examples.
  5. Discuss about the physical properties of emulsions.
  6. Spectrophotometers is used for study of _______ property.
  7. ______ helps in removing the product from the containers.
  8. In suspensions particle size is greater than _____ cm.
  9. Constant motion in zig zag path is called __________.
  10. Define the term rheology.

Friday, May 5, 2023

Enlist the name of the pathogens

 Enlist the name of the pathogens

Milk can be a source of various pathogenic microorganisms that can cause foodborne    illness. Here are 20 examples of pathogens that may be present in milk:

1.    Listeria monocytogenes

2.    Salmonella spp.

3.    Escherichia coli (E. coli)

4.    Staphylococcus aureus

5.    Bacillus cereus

6.    Mycobacterium tuberculosis

7.    Yersinia enterocolitica

8.    Campylobacter jejuni

9.    Cryptosporidium spp.

10. Giardia spp.

11. Shigella spp.

12. Streptococcus agalactiae

13. Brucella spp.

14. Mycobacterium bovis

15. Coxiella burnetii

16. Vibrio cholerae

17. Proteus spp.

18. Aeromonas hydrophila

19. Clostridium perfringens

20. Enterococcus spp.

It's important to note that not all strains of these microorganisms are pathogenic and that the presence of these microorganisms in milk can vary depending on the quality of milk and the conditions of production, handling, and storage. The pasteurization process is an effective method to kill most of these microorganisms and reduce the risk of foodborne illness associated with milk consumption.

The AI Revolution in Dairy Farming: A Game Changer for Productivity, Animal Welfare, and Sustainability

The AI Revolution in Dairy Farming:  A Game Changer for Productivity, Animal Welfare, and Sustainability In a rapidly evolving industry, sta...