ISO 9233-2:2018
Cheese, cheese rind and processed cheese — Determination of natamycin content — Part 2: High-performance liquid chromatographic method for cheese, cheese rind and processed cheese
ISO 9233-2 | IDF 140-2:2018 specifies a method for the determination of natamycin mass fraction in cheese, cheese rind and processed cheese of above 0,5 mg/kg and of the surface-area-related natamycin mass in cheese rind of above 0,03 mg/dm2.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
8.1 Cheese rind
8.2 Cheese interior and processed cheese
9 Procedure
9.1 Test portion
9.1.1 Cheese rind
9.1.2 Cheese interior and processed cheese
9.2 Preparation of test solution
9.2.1 Cheese rind
9.2.2 Cheese interior and processed cheese
9.3 Determination
9.3.1 Determination and detection limits
9.3.2 Adjustment of the liquid chromatograph (6.14)
9.3.3 Calibration graph
9.3.4 Test solution
9.3.5 Low natamycin content
10 Calculation and expression of results
10.1 Calculation of natamycin mass fraction
10.2 Calculation of surface-area-related natamycin mass
10.3 Correction of results
10.4 Expression of results
11 Precision
11.1 Interlaboratory tests
11.2 Repeatability
11.3 Reproducibility
12 Test report
Annex A (informative) Examples
Annex B (informative) Results of interlaboratory trial
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
8.1 Cheese rind
8.2 Cheese interior and processed cheese
9 Procedure
9.1 Test portion
9.1.1 Cheese rind
9.1.2 Cheese interior and processed cheese
9.2 Preparation of test solution
9.2.1 Cheese rind
9.2.2 Cheese interior and processed cheese
9.3 Determination
9.3.1 Determination and detection limits
9.3.2 Adjustment of the liquid chromatograph (6.14)
9.3.3 Calibration graph
9.3.4 Test solution
9.3.5 Low natamycin content
10 Calculation and expression of results
10.1 Calculation of natamycin mass fraction
10.2 Calculation of surface-area-related natamycin mass
10.3 Correction of results
10.4 Expression of results
11 Precision
11.1 Interlaboratory tests
11.2 Repeatability
11.3 Reproducibility
12 Test report
Annex A (informative) Examples
Annex B (informative) Results of interlaboratory trial
Bibliography