Mikrolab Aarhus A/S, Denmark

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Mikrolab Aarhus A/S, Denmark

• Vagn Aagaard Hansen

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ML
DK
World
Denmark
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ML

Europe
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ML - all over the world
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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
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Oxidation stability tests

• Vagn Aagaard Hansen
• Mikrolab Aarhus A/S
• 8270 Hojbjerg - Denmark

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Oxidation - rancidity

• Oxidation gives rancid taste
• Maintain original taste and composition
• By proper storage
• Addition of antioxidants

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Use antioxidants

• reduces rate of oxidation
• 1. longer shelf life
• 2. more efficient production
• 3. cheaper distribution
• 4. better economy

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Accelerated tests

• Quality of raw material
• Test of various antioxidants
• type
• concentration
• Optimize the product
• Test of final product

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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)

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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

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ML Instrumentation

• ML Oxidograph
• pure oil and fat (no water present)
• ML Oxipres
• oil and fat
• food products

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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

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ML Oxidograph

• APPLICATIONS
• Pure oils and fats
• liquid at test temperature
• no water should be present

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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

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ML OXIPRES

• New features
• Stirring of liquid samples
• Collection of volatiles (ATD)

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Oxipres with Stirrer Module
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Top-holder
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ML OXIPRES

• APPLICATIONS
• Peanuts
• Snacks, biscuits
• Mayonaise
• Fish meal
• Cookies, Sponge cake
• Meat
• Cattle feed
• Pet food

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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

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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

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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)

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ML OxipresTM - 1 module
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ML OxipresTM - Control unit
ON/OFF
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ML OxipresTM - Control unit
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ML OxipresTM - 3 modules
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3 Oxipres set-up
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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)

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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

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ML OxipresTM - Potato Chips
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ML OxipresTM - output
bar
4 h
Chips at 90 oC
Time
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ML OxipresTM - Fish oil
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ML OxipresTM - output
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Oxipres - bomb reaction vessel

• Stainless steel bomb
• Glass reaction vessel

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ML Oxipres - Lid lifter
Suction lifter
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ML Oxipres - filling station

• Fast connection by quick-connects
• Fill/vent 2 bombs at the same time
• (same pressure)
• Mounts on the table

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ML OxidographTM
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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

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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

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ML Oxidograph/Rancimat
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ML Oxidograph/Rancimat
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Comparison with the Rancimat
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Some users of ML OXI-instruments