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You can see unexpectedly high values when hydrolyzing fat samples if the samples are not adequately dried after the hydrolysis step. Possible reasons for insufficient drying include: (1) Dryer is not working properly - Filter needs to be replaced -...
With the lignin procedure, two common errors will create false high values. (1) The first error is placing the F57 Filter Bags into the 72% sulfuric acid when there is moisture in the bags and samples. To avoid this situation, after the ADF procedure...
This can occur with samples that are very low in fat. Moisture left in low-fat samples after extraction is the issue. As AOCS Procedure AM 5-04 indicates, when the Filter Bags are removed from the Extractor, they should be placed in an oven at 100...
Refer to Service Procedure High Blank Bag Values (DES035).
This can occur with samples that are very low in fat. Moisture left in low-fat samples after extraction is the issue. As AOCS Procedure AM 5-04 indicates, when the Filter Bags are removed from the Extractor, they should be placed in an oven at 100...
Please refer to Appendix E of the Operator's Manual.
To correct this problem, try one or both of the following procedures: (1) During the de-fat procedure, do two 10-minute soaks in petroleum ether. This is particularly helpful with high fat (> than 20%) samples. (2) It is possible you have a sample...
There are three primary reasons for high Crude Fat results. (1) The bag is not completely sealed; therefore the sample gets lost during extraction. (2) A bag picks up surface fat from another sample. (3) Incomplete drying in the pre-extraction phase...
Refer to RF Service Procedure CO2 Absorption (RFS009).
Static electricity during the weighting process: The largest contributor to poor results is the effect of static electricity on the weighing process. Because plastic gloves can contribute to static electricity, only use anti-static gloves. To...
If a Mojonnier solvent (pet ether, ethyl ether, ethanol) is utilized, a blank value of 0.0030g is normal. If pet ether or hexanes are used, a blank value of 0.0010g is normal. During the hydrolysis phase, fat migration may occur with samples that...
Crude Fat results could be low for any of the following reasons: The extraction was not run long enough. The sample was not post-extraction dried enough. Fat migrated from a bag during the pre-dry step. Desiccant was either not used or incorrectly...
Possible Causes: 1) Sample size is too large. 2) Bags were not acetone rinsed. 3) The rubber baffle spacers fell off. Possible Solutions: 1) Ensure that the procedure is followed completely. 2) Reduce sample size to .025 per procedure. 3) Rinse bags...
Check to ensure the procedures sent with your instrument were followed. Some possible variables that may affect your results are: General Problems: Neutral Detergent chemicals can come out of solution. Heat and stir to bring back into solution. The...
If you do the de-fat procedure using ANKOM XT4 filter bags, after you complete the Kjeldahl digestion, there will be a white substance on top of the resulting liquid. This substance is the PTFE coating on the XT4 filter bags. This substance will NOT...
Static electricity during the weighting process: The largest contributor to poor results is the effect of static electricity on the weighing process. Because plastic gloves can contribute to static electricity, only use anti-static gloves. To...
Research with high fat samples has given us the following understandings: Some samples with fats that have low melting point triacylglycerides or emulsifiers may encounter fat migration during hydrolysis. To improve fat retention, increase the level...
The volume of "dead space" between the vent valve and the septum on an RF module is .003 cubic inches for the RED capped modules, and .043 cubic for the BLACK capped modules.