Lab Report Fatty acid composition of oils_Aqilah Khairuddin
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CHEM2921: Food Chemistry Lab Manual Student name: Aqilah Khairuddin zID:z5432922 1 FATTY ACID COMPOSITION OF OILS: REPORT Results – Method A: GC-MS a. Report your sample information: Table 1.
Sample information Sample number 384 Sample mass / g 0.251g The following formula allows the calculation of the proportion of each methyl ester: Percent Fatty Acid = Peak Area (Fatty Acid methyl ester)
Total peak area × 100 b. Using your GC-MS data provided, and the formula above, calculate the percentage composition of fatty acids in the unknown oil. Total peak area = 72028+ 45927905 + 6268770 + 229964567 + 20831782 + 1703110 = 304768162 % C14 (mystiric)= Peak Area (Fatty Acid methyl ester)
Total peak area × 100
= 72028
304768162
× 100
= 0.02%
% C16 (palmitic) = Peak Area (Fatty Acid methyl ester)
Total peak area × 100
= 45927905
304768162
× 100 =15.07%
CHEM2921: Food Chemistry Lab Manual Student name: Aqilah Khairuddin zID:z5432922 2 % C18 (stearic) = Peak Area (Fatty Acid methyl ester)
Total peak area × 100
= 6268770
304768162
× 100 = 2.07% % C18:1 (oleic) = Peak Area (Fatty Acid methyl ester)
Total peak area × 100
= 229964567
304768162
× 100 =75.46% % C18:2 (linoleic) = Peak Area (Fatty Acid methyl ester)
Total peak area × 100
= 20831782
304768162
× 100 =6.84% % C18:3 (linolenic) = Peak Area (Fatty Acid methyl ester)
Total peak area × 100
= 1703110
304768162
× 100 =0.56%
CHEM2921: Food Chemistry Lab Manual Student name: Aqilah Khairuddin zID:z5432922 3 Figure 1: Gas chromatography and mass spectrum result
CHEM2921: Food Chemistry Lab Manual Student name: Aqilah Khairuddin zID:z5432922 4 Results – Method B: Iodine value and uncertainty calculation 1. Report your raw data: Table 2.
Sample information Sample number 384 Mass / g Sample 0.168 0.174 Concentration of iodine monochloride in glacial acetic acid / mol L
-1 16.2g/L Table 3.
Titration results Volume of thiosulfate / mL Sample 29.5 30.3 Reagent blank 42.1 Concentration of sodium thiosulfate / mol L
-1 0.1 2. Calculate the iodine value (g(I) / 100g) ± uncertainty
from the formula below: iodine value = (b - a) × 1.269
mass of sample
where b = volume (mL) of thiosulfate in titration of reagent blank a = mean volume (mL) of thiosulfate in titration of sample 1. Calculate the mean of the two sample masses: s = 0.168 + 0.174
2
s = 0.171g
2. Calculate the percentage uncertainty of this sample mean: Use the largest mass as mass 1. χ
ୱ
= 0.174 - 0.168
2
÷ 0.171 ×100 χ
ୱ
= 1.754
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Related Questions
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114
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81.4
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218
94
288
1.23
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314
0.81
1.45
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48.8
123
70
291
232
52
0.87
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2.91
-95
111
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200
283
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O NAMING AND DRAWING ORGANIC MOLECULES
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