Milk and dairy products testing


  1. Importance of milk and dairy product testing:
  • Milk is created as an initial source of nutrition for animals before they can digest other foods. The main components of milk include protein, fat, sugar, vitamins and minerals, and water.
  • Dairy products are foods prepared or obtained from the milk or milk-containing products of mammals. Dairy products are mainly produced from the milk of mammals such as cows (cow’s milk), goats (goat’s milk), sheep (sheep’s milk), … and rarely, human milk (mother’s milk, colostrum). Dairy products include many different forms, such as yogurt, cheese, buttermilk, ice cream, etc.
  • In the process of producing milk and milk products, there are many steps that go through: from raw materials to the final product, so it needs to be controlled and monitored to get high-quality and safe products to customers.
  1. Some legal documents and standards stipulate:
  1. List of test items:
    • Microbiological indicators:
  • Analysis to determine the limit of microbiological contamination:
  • Total aerobic microorganisms
  • Enterobacteriaceae
  • Listeria monocytogenes
  • Staphylococci positive for coagulase
  • Staphylococcus endotoxin (Staphylococcal enterotoxin)
  • Coliforms
  • Escherichia coli
  • Salmonella
  • Clostridium perfringens, …
    • Chemical specifications:
  • Sensory (state, color, smell, taste)
  • Physicochemical criteria:
  • Nutrition Facts Table
  • Fat
  • Protein
  • Humidity, …
  • Metal content: Pb, Cd, As, Hg, K, Na, Mg, …
  • Analysis of growth hormone residues and veterinary drugs (Beta Agonist, Testosterone, Progesterone, Macrolide and Lincosamide, Colistin…)
  • Analysis of group antibiotics:
  • Flouroquinolone: Enrofloxacin, Ciprofloxacin, Flumequin, Danofloxacin, Difloxacin, Ofloxacin, Levofloxacin, Sarafloxacin, Norfloxacin, …
  • Sulfonamide: Sulfamethazine (Sulfadimidine), Sulfamethoxazole, Sulfadiazine, Sulfathiazole, Sulfadimethoxine, Sulfamerazine, Sulfamethoxypyridazine, Sulfadoxine, Sulfachinoxalin, Sulfachloropyridazine, Sulfisoxazole, Sulfamonomethoxine, Sulfaphenazole, Sulfabenzamide, Sulfapyridine.
  • Amphenicol: Chlopramphenicol, Florfenicol, Thiamphenicol.
  • Tetracycline: Tetracycline, Chlorotetracycline, Doxycycline, Oxytetracycline.
  • Nitroinidazole: Dimetridazole, Metronidazole, Metronidazole-hydroxyl, Ronidazole, Tinidazole, Ipronidazole, Ipronidazolehydroxyl (IPZ-OH), Metronidazole-hydroxy (MNZ-OH).
  • Malachite green: Malachite green (MG), Leucomalachite green (LMG), Crystal violet (CV), Leucocrystal violet (LCV).
  • Nitrofuran and metabolites: Furazolidone, AOZ, AMOZ, AHD, SEM, …
  • Residues of plant protection drugs of groups: Phosphorus, Chlorine, Chrysanthemum, Carbamate, Trizole, …
  • Identify the components of the groups of substances: Vitamins, Amino Acids, Fatty Acids, Melamine, Cholesterol, …
  • Food additives and food coloring: Sodium Benzoate, Potassium sorbate, BHA, BHT, Tartrazine, Sunset yellow, Aspartame, Saccharin, Acesulfam K, …
  1. Analytical sample background:

TSL provides milk and dairy product testing of all sample subjects:

  • Liquid milk, powdered milk, condensed milk, ….
  • Dairy products: Fermented yogurt, cheese, cake, milk candy, …
  1. Analytical device:
  • In order to promptly meet the needs of customers and improve the quality of milk and dairy products testing activities, TSL has equipped with modern and synchronous analytical equipment:
  • Devices measuring physical parameters: pH, Kjeldalh nitrogen distillation system.
  • Molecular absorption spectrophotometer (UV-Vis).
  • Ion chromatography (IC) system.
  • Liquid chromatography system with probes (HPLC/DAD/FLD, UPLC/DAD/FLD/RID) and liquid chromatography coupled mass spectrometry (LC/MSMS).
  • Gas chromatography systems (GC/FID/ECD) and gas chromatography coupled mass spectrometry (GC/MSMS).
  • Atomic absorption spectrophotometer (AAS) system.
  • Atomic emission spectrometer system (ICP – OES) and ICP – MS system.
  1. Analytical method:
  • All analytical procedures used to test milk and dairy products at TSL are referenced to the standard methods of Vietnam and general standards in the world such as TCVN, QCVN, AOAC, ISO, JECFA, … and all these processes are surveyed and validated in accordance with ISO 17025.
  • All methods are tested to assess staff skills, participate in inter-departmental comparisons and implement domestic and international PT programs.
  • The majority of analytical methods are accredited to ISO 17025 by AOSC.
  • In addition, TSL is also designated by ministries and sectors as a testing agency for state management:
  • The Ministry of Agriculture and Rural Development – ​​Director of the Department of Quality Management of Agro-Forestry-Fisheries and Agro-Forests and Fisheries appointed in the certificates: 249/QD-QLCL and 74/QD-QLCL.
  • The Ministry of Industry and Trade specified in the certificates: 392/QD-BCT and 2032/QD-BCT.