AS 2300.4.8-1994

1-AS 2300.4.8-1994 METHODS OF CHEMICAL AND PHYSICAL TESTING FOR THE DAIRYING INDUSTRY - DRIED MILK AND DRIED MILK PRODUCTS - DE
1-PREFACE
1-METHOD
1-1 SCOPE
1-2 REFERENCED DOCUMENTS
1-3 PRINCIPLE
1-4 REAGENTS (See also Appendix A)
1-4.1 General
2-4.2 Sodium chloride
2-4.3 Amido black dye solution
2-4.4 Citric acid monohydrate
2-4.5 Sodium chloride, saturated solution
2-4.6 Standard dried skim milk powder
2-5 APPARATUS (See also Appendix A)
2-5.1 Balance
2-5.2 Stoppered test tubes
2-5.3 Filter funnel
2-5.4 Filter papers
2-5.5 One- mark pipettes
2-5.6 Capillary pipette or pipettor
2-5.7 One-mark volumetric flasks
2-5.8 Water bath
2-5.9 Glass centrifuge tubes
2-5.10 Centrifuge
2-5.11 Spectrophotometer
2-6 TEST SAMPLES
3-7 PROCEDURE
3-7.1 Determination
3-7.2 Zero UDWPN check
3-7.3 Standard curve
4-8 CALCULATION
4-9 REPEATABILITY
4-10 TEST REPORT
4-11 REFERENCES
5-APPENDIX A - METHOD FOR DETERMINING THE UDWPN CONTENT OF THE STANDARD DRIED SKIM MILK POWDER
5-A1 SCOPE
5-A2 PRINCIPLE
5-A3 REAGENTS
5-A3.1 General
5-A3.2 Sodium chloride
5-A3.3 Hydrochloric acid solution (8. 5 g HCl/ 100 mL)
5-A3.4 Reagents for the Kjeldahl determination of nitrogen
5-A4 APPARATUS
5-A4.1 Erlenmeyer flasks
5-A4.2 Erlenmeyer flasks
5-A4.3 Bulb pipettes
5-A4.4 Straight pipette
5-A4.5 Filter funnels
5-A4.6 Watch- glasses
5-A4.7 Filter papers
5-A4.8 Water bath
5-A4.9 Centrifuge bottles
5-A4.10 Centrifuge
6-A4.11 Apparatus for the Kjeldahl determination of nitrogen
6-A4.12 pH meter
6-A5 TEST SAMPLE
6-A6 PROCEDURE
6-A6.1 Determination
6-A6.2 Blank test
7-A7 CALCULATION