1. Mikrolab Aarhus A/S, Denmark
Vagn Aagaard Hansen

2. ML DK
World
Denmark

3. ML +
Europe

4. ML - all over the world

5. Mikrolab Aarhus A/S
The company is situated in Aarhus (in Jutland) and serves customers all over Denmark.
Some of ML’s own products are exported.
ML represents several companies of good reputation from all over the world.
Aarhus

6. Oxidation stability tests
Vagn Aagaard Hansen
Mikrolab Aarhus A/S
8270 Hojbjerg - Denmark

7. Oxidation - rancidity Oxidation gives rancid taste
Maintain original taste and composition
By proper storage
Addition of antioxidants

8. Use antioxidants reduces rate of oxidation: 1. longer shelf life
2. more efficient production
3. cheaper distribution
4. better economy

9. Accelerated tests Quality of raw material Test of various antioxidants
type
concentration
Optimize the product
Test of final product

10. What is measured? = IPwith antiox. / IPwithout antiox.
Oxygen consumption = pressure drop
IP = Induction period
= Time from start until rate of oxygen uptake increases (related to temp.)
PF = Protection factor
= IPwith antiox. / IPwithout antiox.
LE = Life extension
= 100 x (PF - 1) %

11. Predicted shelf life IP = 50 hours (at 60 oC)
Reaction rate (doubles) by heating 10 oC
Shelf life at 20 oC = 24 x 50 = 800 hours
This is only a thumb rule and must be used with care

12. ML Instrumentation ML Oxidograph™ ML Oxipres™
pure oil and fat (no water present)
ML Oxipres™
oil and fat
food products

13. ML OXIDOGRAPH™ Oxygen at elevated temperature Stirred sample
Start at atmospheric pressure
Pressure drop measured
Static test - realistic test conditions
Volatiles stay with the sample
Volatile pro-oxidants
Volatile anti-oxidants
Volatile reaction products

14. ML Oxidograph™ APPLICATIONS: Pure oils and fats
liquid at test temperature
no water should be present

15. ML OXIPRES™ Oxygen at elevated temperature
Overpressure in a SS-vessel (5 bar)
Pressure is measured over time
Static test - realistic test conditions
Heterogenous samples

16. ML OXIPRES™ New features: Stirring of liquid samples
Collection of volatiles (ATD)

17. Oxipres with Stirrer Module

18. Top-holder

19. ML OXIPRES™ APPLICATIONS: Peanuts Snacks, biscuits Mayonaise Fish meal
Cookies, Sponge cake
Meat
Cattle feed
Pet food

20. Procedure Turn on the block heater Weigh the sample in the vial
Place the sample vial in the pressure vessel
Flush with oxygen
Apply pressure
Place the bomb in the heater
Start the test

21. Resumè ML Oxidograph™ ML Oxipres™ Pure oil and fat 6 positions°C
1/5 V analog output
Heterogenous samples
modular: 2, 4 or 6 pos. °C
1/5 V analog output

22. Installation 230 (120) V AC Oxygen cylinder
Cylinder pressure regulator - 1/8” tubing
Filling station
PC (Windows XP or Vista)
USB-converter
Paralog (Ver. 3 software) or
Recorder (2-6 channels)

23. ML OxipresTM - 1 module

24. ML OxipresTM - Control unit
ON/OFF

25. ML OxipresTM - Control unit

26. ML OxipresTM - 3 modules

27. 3 Oxipres set-up

28. Paralog™ Software Collects data from OXI-instruments
Shows instruments and positions
Shows curves
Automatic (or manual) IP detection
Prints report
Data stored in ASCII format (> Excel)
Pick old data
Print old data report
Select language (future)

29. Requirements: PC (or LapTop) w. Win XP or Vista
Processor: Intel Pentium III (500 MHz) or higher
Free hard disk space:
Program: 1 GB
Test files: 5 GB
RAM, XP: 512 MB (Win XP)
Slots: USB1 or higher (1 for each converter or use a USB-hub)
Monitor: x 768
Color printer
USB converter PICOtech (between the instrument and the PC) – takes up to 11 signals
Java
Driver for the USB-converter (PICOtech)
Software, Paralog 3

30. ML OxipresTM - Potato Chips

31. ML OxipresTM - output
bar
4 h
Chips at 90 oC
Time

32. ML OxipresTM - Fish oil

33. ML OxipresTM - output

34. Oxipres - bomb + reaction vessel
Stainless steel bomb
Glass reaction vessel

35. ML Oxipres - Lid lifter
Suction
lifter

36. ML Oxipres - filling station
Fast connection by quick-connects
Fill/vent 2 bombs at the same time
(same pressure)
Mounts on the table

37. ML OxidographTM

38. Oxidograph - glassware
Reaction vessel
Top with threads G 14
Tube with stop
Screw cap B 34
O-ring
Antilock ring
Screw cap B 14
Silicone ring 7x12 mm

39. Oxipres - Schaal Oven Test
Weigh a set of scintillation vials - add 1,0 gram of sample to each
Place up to 6 vials in each bomb
Close the bomb - add oxygen to 5 bars
Place the bomb in the block heater for x hours
Release the pressure, let the vial cool down and weigh again
Repeat the procedure y times

40. ML Oxidograph/Rancimat

41. ML Oxidograph/Rancimat

42. Comparison with the Rancimat

43. Some users of ML OXI-instruments