Title: Identifying Nutrients:
Carbohydrates, Proteins, and Lipids
► Abstract:
There are six essential nutrient groups
that make up 96% of all living things.
Carbohydrates, Proteins and Lipids are three of
these categories that can be identified in food
sources by testing for the presence with reagents
such as Lugols, Benedicts, Biurets and Sudan III.
These chemicals changed colors to indicate the
positive presence of one of these nutrient groups.
Introduction
► Background
Information:
Use your lab handout . The handout provided
important information on the role of
proteins, carbohydrates and fats; the
structure and function of each group and
what food sources usually have these food
groups.
Objective
► The
objective of this study was to determine
the presence of ______________,
________________,
and___________________. If certain
chemicals called indicators are added to
food groups, then a color change will occur
and identify if one of the nutrients is
present.
Methods
► The
method to performed the experiment is
similar to one documented by (add internet
URL)
____________________________________
______________________________. Four
test tubes were filled with a small quantity
of one food item each:
____________________________________
___________________________________.
►
Also, potatoes and lard were placed in individual weigh
boats and were also tested with the same indicators. The
weigh boats were used to avoid clogging test tubes. The
test tubes were filled with 3 droppers of one particular
reagent.
►
The four tests were run using the following reagents:
Lugols, Benedicts, Biuret and Sudan III. Between each
trial, test tubes were ____________ and ____________,
to avoid contamination. Furthermore, when testing with
Benedicts, the test tubes were placed in a water bath to
break down the sugar bonds.
Results:
► The
following chart denotes the food items
and the reagent. A color change indicates
the presence of Protein, Carbohydrates and
Fat.
► Insert table, chart or graph.
Discussion
► The
author noted that the potato responded to the
reagent ____________ by changing from yellow
to ________________. This color change tests
positive for ____________. Therefore, potatoes
must contain ________________.
► Continue with the rest.
► (Make sure you include errors, repeats, weird
observations and try to explain them…did you
forget to place test tubes in the water bath? Did
you heat a test tube with the wrong reagent? Etc.)
Conclusion
► The
nutrient groups Proteins, Carbohydrates
and Fats are essential life. A source of
protein is found in __________. Biurets will
change from ________to _________
indicating proteins. Heat will speed up the
reaction time.
► Continue with your conclusions…
Reference and Acknowledgement
► List
► End
the Internet URls,
with a quick few sentences
acknowledgement that your lab partner (s)
provided. What test did they perform?, did
they assist?, lead, not do anything etc.