Nutrition
Experiment
Aim: testing wet dog food to see if simple and complex carbohydrates were present.
Method: Start by getting all your equipment together: the chemicals, test tubes in the holder and dog food ready. Biuret added to dog food allows the dog food to turn from blue to lilac when protein is present. When it is not present it stays blue. To test for starch you use iodine add it to the food in the test tube and turns from red to black when starch is present. It is a complex carbohydrate (polysaccharide). To test for simple sugars (glucose) you use Benedict’s reagent this is a monosaccharide start by adding Benedict’s reagent to the food heat it up in a beaker of water under a Bunsen burner little sugar will indicate when it turns green a lot of sugar when it turns from blue to dark red. If it does not work you add hydrochloric acid to a fresh food sample to break down bonds in to monosaccharide heat it up take it out of the heat then add sodium hydrogen carbonate. It then fizzes and add Benedict’s to the food and it will change to red. To test for fat you use ethanol add ethanol to food shake it up and pour in to another test tube of water and a cloudy layer will form on top of the water if it is present. Once all of the tests have been carried out wash the test tubes out, turn the Bunsen burner off as soon as you are finished with it. Wash your hands once you have cleared everything away.
Dependent variable: the level of complex and simple sugars in the dog food
Independent variable: Wet dog food
Controlled variable: same amount of food and solutions added to the food. Time you leave the food in the solution before you measure the result.
Prediction: the dog food that is the cheapest will have less nutritional value to that of higher quality. The food that had more protein in would have less carbohydrates.
List of Apparatus:
Test tubes and holder
Beaker
Bunsen burner
Heat matt
Tripod
Dog food
Heat gauze
Glass rod
Heat protective glove
Aim: testing wet dog food to see if simple and complex carbohydrates were present.
Method: Start by getting all your equipment together: the chemicals, test tubes in the holder and dog food ready. Biuret added to dog food allows the dog food to turn from blue to lilac when protein is present. When it is not present it stays blue. To test for starch you use iodine add it to the food in the test tube and turns from red to black when starch is present. It is a complex carbohydrate (polysaccharide). To test for simple sugars (glucose) you use Benedict’s reagent this is a monosaccharide start by adding Benedict’s reagent to the food heat it up in a beaker of water under a Bunsen burner little sugar will indicate when it turns green a lot of sugar when it turns from blue to dark red. If it does not work you add hydrochloric acid to a fresh food sample to break down bonds in to monosaccharide heat it up take it out of the heat then add sodium hydrogen carbonate. It then fizzes and add Benedict’s to the food and it will change to red. To test for fat you use ethanol add ethanol to food shake it up and pour in to another test tube of water and a cloudy layer will form on top of the water if it is present. Once all of the tests have been carried out wash the test tubes out, turn the Bunsen burner off as soon as you are finished with it. Wash your hands once you have cleared everything away.
Dependent variable: the level of complex and simple sugars in the dog food
Independent variable: Wet dog food
Controlled variable: same amount of food and solutions added to the food. Time you leave the food in the solution before you measure the result.
Prediction: the dog food that is the cheapest will have less nutritional value to that of higher quality. The food that had more protein in would have less carbohydrates.
List of Apparatus:
Test tubes and holder
Beaker
Bunsen burner
Heat matt
Tripod
Dog food
Heat gauze
Glass rod
Heat protective glove
Conclusion:
The results the experiment showed are not accurate enough and controlled enough in order to make a valid conclusion. However, from the results Webbox, butchers lean and Bakers food had the highest nutritional value. Chappy, Morrison’s and butchers puppy had the least nutritional value.
Evaluation:
This experiment was not precise. Therefore the results that I got was not accurate. This was because we did not put measures in place such as controlling the amount of chemicals that were put in each test tube as well as not measuring the amount food was placed in the test tube. Along with this how long you left the food in the substance before you measured the results. In order to make this more accurate you would put these measure in place for future experiments.
The results the experiment showed are not accurate enough and controlled enough in order to make a valid conclusion. However, from the results Webbox, butchers lean and Bakers food had the highest nutritional value. Chappy, Morrison’s and butchers puppy had the least nutritional value.
Evaluation:
This experiment was not precise. Therefore the results that I got was not accurate. This was because we did not put measures in place such as controlling the amount of chemicals that were put in each test tube as well as not measuring the amount food was placed in the test tube. Along with this how long you left the food in the substance before you measured the results. In order to make this more accurate you would put these measure in place for future experiments.
