EXAMPLE OF MOISTURE AND ASH RESULTS IN
FLOUR
|
Instrument Parameters
|
Moisture - 150 ºC, Plateau Deviation 0.051%
Ash - 600 ºC, Plateau Deviation 0.031% then hold for 35 minutes
|
|
Conclusions
|
Moisture and ash analysis can be performed on the same sample in 4 - 5 hours
depending on sample size. Moisture within day standard deviation was
consistently around 0.02. Between day moisture standard deviation was
artificially high due to moisture loss during the three-week testing period.
Within day standard deviation for ash was consistently less than 0.006
for both sample types and sizes. The 4.5g sample allows for ash values to
have a standard deviation of approximately 0.005 over time compared to 0.007
for the 3g.
|
Table 1. Summary of Results
Flour Type |
Hard |
Hard |
Hard |
Soft |
Soft |
Sample Weight (g) |
3.0 |
4.5 |
3.0 |
4.5 |
3.0 |
4.5 |
3.0 |
4.5 |
3.0 |
4.5 |
n |
27 |
26 |
26 |
26 |
26 |
25 |
27 |
27 |
27 |
26 |
Moisture Avg |
13.98 |
13.96 |
13.86 |
13.85 |
13.89 |
13.88 |
11.31 |
11.33 |
12.95 |
12.94 |
Within Day Std (n=3) |
0.02 |
0.03 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.01 |
0.02 |
0.02 |
Between Day Std (n=9) |
0.08 |
0.08 |
0.16 |
0.16 |
0.10 |
0.10 |
0.02 |
0.01 |
0.06 |
0.06 |
Ash Avg |
0.472 |
0.478 |
0.508 |
0.512 |
0.567 |
0.572 |
0.384 |
0.390 |
0.508 |
0.509 |
Within Day Std (n=3) |
0.005 |
0.005 |
0.005 |
0.005 |
0.005 |
0.004 |
0.006 |
0.003 |
0.005 |
0.003 |
Between Day Std (n=9) |
0.007 |
0.005 |
0.008 |
0.005 |
0.008 |
0.005 |
0.007 |
0.003 |
0.007 |
0.003 |
Mst Time (min) |
60 |
77 |
60 |
77 |
60 |
77 |
60 |
77 |
60 |
77 |
Ash Time (min) |
183 |
225 |
183 |
225 |
183 |
225 |
183 |
225 |
183 |
225 |
Total Time (min) |
243 |
302 |
243 |
302 |
243 |
303 |
243 |
303 |
243 |
302 |
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