Preserving Food

Some questions that were not answered during our KWL lesson:

  1. Is there any magical zip lock bag that can preserve food longer than any other receptacle?
  2. Will mould grow in preserved food?
  3. Are preservatives chemical substances?
  4. Who invented preservatives?
  5. What are the chemicals that can preserve food?
  6. Are any preserved food unhealthy?
  7. Are there any other alternative ways to preserve food other than the ones that we already know?

Respond to the questions and build our knowledge on preserving food at the same time.

4 comments:

  1. kaifengSeptember 4, 2013 at 4:56 PM

    1)no
    2)Food preservation usually involves preventing the growth of bacteria, fungi (such as yeasts), and other micro-organisms (although some methods work by introducing benign bacteria, or fungi to the food), as well as retarding the oxidation of fats that cause rancidity.
    3)Yes
    4) People have been using perservatives since the beginning of time
    5)propionic acid, sorbic acid, benzoic acid, and sulfur dioxide
    6)It is estimated that 70% of the processed food have no nutritional value. These foods produce little enzyme activity and contain little or no fibrous material.
    7)Drying,Pasteurization,Refrigeration,Freezing,Vacuum packing,Preservation by oil and vinegar,Salt,Sugar,Smoking,Artificial food additives,Pickling,Lye,Canning and bottling,Jellying,Jugging,Irradiation,Pulsed electric field electroporation,Modified atmosphere,Nonthermal plasma,High-pressure food preservation,Burial in the ground,Controlled use of micro-organism,Biopreservation,Hurdle technology.

    For question 7, go to http://en.wikipedia.org/wiki/Food_preservation
    to see how to use them...

    ReplyDelete
  2. Mr KSeptember 5, 2013 at 10:43 AM

    Awesome Kaifeng!

    ReplyDelete
  3. Nur AmeerahSeptember 5, 2013 at 5:34 PM

    1. No.
    2. No.
    3. Yes.
    4. No one. People have been using perservatives since the beginning of time.
    5. Propionic acid, sorbic acid, benzoic acid, and sulfur dioxide.
    6. Estimated that 70% of the "normal" diet have no nutritional value. These foods produce little enzyme activity and contain little or no fibrous material.
    7. Drying,Pasteurization,Refrigeration,Freezing,Vacuum packing,Preservation by oil and vinegar,Salt,Sugar,Smoking,Artificial food additives,Pickling,Lye,Canning and bottling,Jellying,Jugging,Irradiation,Pulsed electric field electroporation,Modified atmosphere,Nonthermal plasma,High-pressure food preservation,Burial in the ground,Controlled use of micro-organism,Biopreservation and Hurdle technology.

    ReplyDelete
  4. UnknownSeptember 6, 2013 at 3:57 PM

    1. No.
    2. No.
    3. Yes.
    4.Nobody.. People have been using perservatives since the beginning of time.
    5. Propionic acid, sorbic acid, benzoic acid, and sulfur dioxide.
    6.It is estimated that 70% of the "normal" diet have no nutritional value. These foods produce little enzyme activity and contain little or no fibrous material.
    7. Drying,Refrigeration,Pasteurization,Freezing,Vacuum packing,bottling,Jellying,Jugging,Irradiation,Burial in the ground.

    ReplyDelete

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