Product category:
Materials Testing
News Release from: Metrohm UK | Subject: 797 VA Computrace
Edited by the Manufacturingtalk Editorial
Team on 13 September 2006
Polarographic determination of cystine,
cysteine
The polarographic determination of cystine and cysteine with Metrohm's devices is easy and straightforward.
After the degradation of biological samples (e.g milk, wool, etc), it is often important to know the cystine/cysteine ratio The proposed method describes the simultaneous determination of the two amino acids by differential pulse polarography at the dropping mercury electrode (DME)
This article was originally published on Manufacturingtalk on 18 Aug 2006 at 8.00am (UK)
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Vitamin C determined by ion chromatography
The content of vitamin C of vegetables, juices and other food can be determined by titration, ion chromatography or polarography.
Milk and sodium caseinate produced from milk have high protein contents.
They have to be analysed in alkaline solution to prevent precipitation of proteins on the separation column.
The determination limits are approx.
50 ug/L for cysteine and approx.
1 mg/L for cystine.
The polarographic determination of cystine and cysteine with Metrohm's devices is easy and straightforward: Just choose the method in the built-in database of your 797 VA Computrace and start the determination using the MVA-2 which consists of the 797 VA Computrace and two 800 Dosinos. Request a free brochure from Metrohm UK ...
Or the 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.
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