Fatmeter Measurements vs Foss-Let Chemical Method

Introduction

If you wish to the accuracy of the Fatmeter Measurements, and compare the results with Foss-Let Laboratory Analysis Method for an accurate appraisal of its performance, it is essential that the techniques employed are the same as those from which the original calibration data were derived.

When checking the calibration of the Fatmeter against the Foss-Let Method a key element in the process is the preparation of fish samples for these determinations. The purpose of this note is to describe the procedures to be used in the preparation of these samples. For detailed instructions please refer to theUser Manual and calibration charts supplied with the meter.

Background

In attempting a calibration check of the Fatmeter, there are THREE points which must be understood. These are:

  • The Fatmeter is primarily intended as a tool for those involved in the meat industry. It provides a non-destructive estimate of the fat content of the natural and processed meats. Please refer to measurement instructions for the product.
  • The Fatmeter is an averaging instrument and to ensure accuracy, especially where large batches of meat product are to be measured, several random samples should be taken from various locations within the batch before the specified accuracy of the instrument can be achieved. On the other hand, the fat content of a single sample can be assessed accurately if EIGHT readings are taken from a well mixed batch of meat.
  • All fat content measurements used in the preparation of the calibration data for the Fatmeter were obtained using a Foss-Let Oil Meter. This laboratory chemical extraction method requires a 45g sample of the meat product. To allow for losses in mincing, a sample of the meat product with a minimum weight of 60g should be prepared. It is advisable to prepare enough minced material in case a duplicate Foss-let measurement is required, so that a sample of at least 100g in weight is desirable. It is also good practice to carry out triplicate Foss-Let measurements on each filtrate. Any contamination of the filtrate or of the Foss-Let itself will then be immediately apparent.