Introduction to Vitamin C
Vitamin C is the L-enantiomer of ascorbic acid. Our
body cannot synthesize and store vitamin C. Therefore
it is essential to obtain it from the food we are consuming
daily. Ascorbic acid and its sodium, potassium and calcium
salts possess antioxidant properties. They can prevent
reactive oxygen species (ROS, for example hydrogen peroxide)
from damaging our body cells by taking up their reactive
electrons.
Drinks, fruit and vegetable juices are natural sources
of vitamin C. The content of vitamin C of vegetables,
juices and other food can be determined by titration,
ion chromatography or polarography.
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Voltammetric analysis of vitamin C
The analysis by polarography is very selective as other
reducing or oxidizing substances do not interfere. By
using a 797
VA Computrace various polarographic and voltammetric
methods are at hand and moreover you are given all the
necessary electrodes for performing hundreds of applications.
In the case of the vitamin C determination
in orange juice no sample preparation steps
are necessary.
The analysis is done by differential pulse
polarography (DPP) at a dropping mercury
electrode (DME). Just choose the method in
the built-in database of your 797 VA Computrace. With
a single mouse click all settings are done and you can
start measuring.
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Product information
| MVA-2 system intended for partly automated routine analysis
and consisting of the 797 VA Computrace and two 800 Dosinos. |
MVA-2 |
Options |
|
| MVA-3 system for fully automated analysis of small series of samples consisting
of the 797 VA Computrace, a 813 Compact Autosampler, two 800 Dosinos, a
731 Relay Box and two 772 Pump Units |
MVA-3 |
Send
me product information! |
Get more information
|
Tips
- Up to 18 samples are easily processed fully
automatically by the MVA-3 system.
-
Validation: For the Validation of Metrohm VA instruments using
Standard Operating Procedures see our Application Bulletin 276
(Info
Center).
- If you already have a titration system
(Titrino or Titrando), then you can determine the
vitamin C content according to the methods described
in our Food
PAC.
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Food
Analysis 
