• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

This experiment design by a group of general science to test different foods for protein present, the experiment will be focus on the present of protein in different kind of food, using biuret test.

Extracts from this document...

Introduction

Introduction This experiment design by a group of general science to test different foods for protein present, the experiment will be focus on the present of protein in different kind of food, using biuret test. Protein contains carbon, hydrogen, oxygen and nitrogen. Some have phosphorous, there are 20 amino acid that make up protein 9 of them are essential for growth, repair tissues and for build up muscles, however our body can not produce them we have to consume them. Not all protein containing foods have all 9 essential proteins. The protein of cereals, most beans and vegetables may contain all the essential amino acids. same of them we have to mixes them with other proteins. Hypothesis The following foods will contain protein such as meat, milk, fish, eggs, nuts and tuna and the following foods will not contain high amount of protein such as tomato, potatoes, bread, chocolate and rice. Animal food can contain a higher percentage of protein than vegetable food, but it also has a high percentage of fat. Material * 5 test tubes * Test tube rack * Distilled water * Chocolate (3 gram) * Tuna ( 3 gram) * Biscuit ( 3 gram) lamb meat ( 3 gram) and tomato ( 5 gram) ...read more.

Middle

through a sample and the machine determines the percent that the light is absorbed by the sample. Optical method this is measurement of protein concentration relies on optical properties, virtually all proteins show UV absorbance maximum near 280 nm. This characteristic absorbance is due almost entirely to the absorbance by the aromatic ring in the R-groups of the amino acids tryptophan and tyrosine, during this test samples are placed directly in a spectrophotometer capable of generating and measuring UV light, no chemical reagent is involved here, as in the Biuret test, because the UV absorbance is an basic property of the protein itself. the strength of the method used by industry is more reliable as the product will be supply to public, scientists analyses the method several time before the product export or supply to the public. The weakness is the equipment used in industry to test protein is expensive, therefore The experiment design by student maybe affected by those industry method because, in industry there are more equipment which measure the quantitative, error and purity whereas in college the equipment is limited. Task 2 .1(P2.P3) B The following data shows the result of the experiment performed to investigate the present of protein in different foods. Amount of foods per gram * Nat 3 gram * Kit kat chocolate 3 gram * White bread 3 gram * Rice ...read more.

Conclusion

Therefore to get reliable and accurate result on this experiment it is important to have proper facility and equipment, for instance instead of only just testing the colure if there was a test that can determine the quantity of the protein would make a big different to the experiment result. In addition an experiment starts and finishes with the factors that change during the experiment. These are the variables; purposely changing one of the variables will make a different to the experiment, for example if the experiment designer changes the amount of chemical and see the outcome, the independent variable would be the amount of the chemical and the dependent variable would be the result. Task 3.1 (P4) In conclusion, the result of the investigation shows that same food such as rice and nut they contain protein. Whereas bread and chocolate contain only sugar the test proved that by changing the colour of the food. Having doing the test the result shows that minced meat was absent of protein. Although it known as red meat contain high amount of protein, it estates this in the discussion part of the assignment, this could be error with the method or the quality of food. this experiment constantly the result of the experiment can be affected by the amount of food http://hkpho.phys.ust.hk/Training/LectNotes/experiment.pdf ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Home Economics - Why is nutrition important to sports people?

    5 star(s)

    Examples include cellulose, pectin, guar gum and beta glucan. Fibre is defined as non starch polysaccharide (NSP) in the UK. Although not a carbohydrate, lignin is often included as fibre. The substances that make up fibre may have different actions in the body .A small amount of starch is not

  2. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    Principles and concepts In the solutions where the uptake of nitrogen took place the fronds on the duckweeds grew. This is because nitrogen is an essential component for the plant's growing process.

  1. Marked by a teacher

    'An investigation into the ability of two strains of the yeast Saccharomyces cerevisiae to ...

    4 star(s)

    The use of the fixed colour chart during the main experiment meant that this could not be a recurring factor. The results displayed in table 3 and table 4 show the volumes of NaOH in cm3 required to neutralise 25cm3 samples of the yeast/sugar mixtures after incubation.

  2. Marked by a teacher

    The Effectiveness of Different Solutions to Prevent or Treat Malaria

    4 star(s)

    for the treatment of malaria.? This drug is a great way to treat malaria and better than other non-artemisinin based combination drugs, but due to the fact that resistance has rapidly increased on sulfadoxine-pyrimethamin drug it is no longer recommended by the WHO (World Health Organization).

  1. the effect of bile concentration on the activity of the enzyme lipase during the ...

    Subsequently because we used low concentrations of the enzyme lipase I believe this to be the most significant limiting factor the lipase that is used in the body will be at higher concentrations and so will the bile salts because the body is able to reuse both.

  2. Investigating the effects of Sodium Hydroxide concentration on Catalase

    to take and at what times, as to say a reading every 30 seconds would not give me a relieavable set of restls, and say every 2 seconds will give me a lot of restls and also it wuld be very hard to take a reading every 2 seconds.

  1. An investigation into the distribution of adult and juvenile limpets on a rocky shoreline.

    B Once I will have found the chi-squared number, I can compare it to a significant table in order to find out how significant the results are and either reject the null hypothesis showing that the abiotic and biotic factors affecting the distribution of limpets or I can accept the

  2. out how different concentrations of the enzyme pectinase affect the degradation of the substrate ...

    * I have to look at the lower meniscus of the solution in the measuring cylinder or syringe, so that I avoid any errors in the volume. * I require labelling the beakers and measuring cylinders with their enzyme concentration, so that I do not mix up the concentrations and cause any confusion.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work