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Mikrolab Aarhus A/S, Denmark

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Title: Oxidation stability tests Author: Vagn Aagaard Hansen Last modified by: vah Created Date: 5/23/1997 9:24:46 AM Document presentation format – PowerPoint PPT presentation

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Title: Mikrolab Aarhus A/S, Denmark


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 MLs 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?
  • 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
  • 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
  • 30 - 150 C
  • 1/5 V analog output
  • Heterogenous samples
  • modular 2, 4 or 6 pos.
  • 30 - 150 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 (gt 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 1024 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
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