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    Biomolecule Lab Report 4

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    api-371365584
    This lab report summarizes tests performed on a murder victim's stomach contents to determine what foods they may have consumed prior to death. Chemical tests were used to detect the presence of lipids, proteins, carbohydrates and starch. The results were positive for lipids, proteins, and starch but negative for glucose, indicating the victim ate foods containing fats, proteins, and complex carbohydrates/starches but not simple sugars shortly before death. Based on these results, the foods ingested could include most normal daily foods but not those containing simple sugars like fruit, candy or dairy.

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    Biomolecule Lab Report 4

    Uploaded by

    api-371365584
    240 views2 pages
    This lab report summarizes tests performed on a murder victim's stomach contents to determine what foods they may have consumed prior to death. Chemical tests were used to detect the presence of lipids, proteins, carbohydrates and starch. The results were positive for lipids, proteins, and starch but negative for glucose, indicating the victim ate foods containing fats, proteins, and complex carbohydrates/starches but not simple sugars shortly before death. Based on these results, the foods ingested could include most normal daily foods but not those containing simple sugars like fruit, candy or dairy.

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    biomolecule lab report 4

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    This lab report summarizes tests performed on a murder victim's stomach contents to determine what foods they may have consumed prior to death. Chemical tests were used to detect the presence of lipids, proteins, carbohydrates and starch. The results were positive for lipids, proteins, and starch but negative for glucose, indicating the victim ate foods containing fats, proteins, and complex carbohydrates/starches but not simple sugars shortly before death. Based on these results, the foods ingested could include most normal daily foods but not those containing simple sugars like fruit, candy or dairy.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    240 views2 pages

    Biomolecule Lab Report 4

    Uploaded by

    api-371365584
    This lab report summarizes tests performed on a murder victim's stomach contents to determine what foods they may have consumed prior to death. Chemical tests were used to detect the presence of lipids, proteins, carbohydrates and starch. The results were positive for lipids, proteins, and starch but negative for glucose, indicating the victim ate foods containing fats, proteins, and complex carbohydrates/starches but not simple sugars shortly before death. Based on these results, the foods ingested could include most normal daily foods but not those containing simple sugars like fruit, candy or dairy.

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    Biomolecule Lab Report

    This lab testing was in search for our CSI Lab research that we prepared for by studying the
    basics of carbohydrates, lipids, proteins and some details from the murder victim. We had a
    hypothesis: Based on the victim's stomach contents, a victim could have multiple dishes that
    correspond with our results. A positive result will have positive in the positive test results
    column, and a negative result would have a negative test result in the negative test result
    column.

    Table 1
    Macromolecules Chemical Test Positive Test Results Negative Test Results

    Lipids Sudan IV Positive-SDIV(red) A negative result would


    mixture represented not have drops, and
    by red droplets, since there would be
    the SDIV sticks to separate levels.
    lipids.

    Proteins Burriets Positive-The mixture A negative test result


    after a good 5 min. would be blue.
    showed a lilac color.

    Carbs Monosaccharide A positive test result Negative-The mixture


    Glucose would be a turned a putrid
    orangey/red. yellow-green, which
    would test neg.

    Carbs Iodine Positive-Our mixture A yellow-orange would


    Starch turned a very deep conclude negative.
    purple, virtually black
    that we took as a
    strong positive.

    Victim's Stomach Contents Test Results


    Table 2
    Test for lipids Test for Proteins Test for Glucose Test for Starch

    Observations:There Observations:The Observations:The Observations:Our


    was solubility shown test showed after 5 mixture turned a mixture turned a very
    to occur between the minutes a change in putrid yellow-green, deep purple, virtually
    stomach contents color to a lilac. which would test neg. black that we took as
    and the SDIV(red) a strong positive.
    mixture represented
    by red droplets, since
    the SDIV sticks to
    lipids.

    Present? Yes Present? Yes Present? No Present? Yes

    Not Present? Not Present? Not Present? Not Present?

    Image 1 Image 2
    1st tube Monosaccharides-Concluded Negative
    2nd tube Polysaccharides-Concluded Positive
    3rd tube Burritts-Concluded Positive
    4th tube Sudan IV-Concluded Positive
    5th tube Control

    Conclusion
    We tested positive for polysaccharides, proteins, and lipids. As well as negative for simple
    sugars in the monosaccharide testing. We conclude that the victim could have ingested almost
    anything of normalcy in a daily diet, but couldnt have digested something containing simple
    sugars such as fruit, candy, dairy, and honey. Although the victim could have ingested
    something of complex sugars, polysaccharides, proteins, and lipids. This is the only
    distinguishing finding we conclude based on the test results.

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