Shelf-life of unused high-performance liquid chromatographic columns

1985 ◽  
Vol 346 ◽  
pp. 461-462 ◽  
Author(s):  
N.G.S. Gopal ◽  
G. Sharma
Foods ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 160
Author(s):  
Francisca Hernández ◽  
Lucía Andreu-Coll ◽  
Andreia Bento-Silva ◽  
Ana Teresa Serra ◽  
Pedro Mena ◽  
...  

This research analyzed the phytochemical profile of prickly pear fruits from ‘Orito’ cultivar stored under cold conditions (2 °C, 85–90% RH) and shelf-life conditions at room temperature (stored at 20 °C for three days after cold storage) for 28 days, mimicking the product life cycle. A total of 18 compounds were identified and quantitated through HPLC-DAD-MS/MS (High-Performance Liquid Chromatographic -Diode Array Detector- Mass Spectrometry) analyses. Phenolic acids such as eucomic acid and betalains such as indicaxanthin were the predominant chemical families, and piscidic acid was the most abundant compound. During cold storage, the content of eucomic acid isomer/derivative and syringaresinol increased, and citric acid decreased, which could be caused by the cold activation of the phenylalanine ammonia-lyase (PAL) and polyphenol oxidase (PPO) enzymes. However, no significant differences were found in the content of these compounds during shelf-life storage. These results showed that ‘Orito’ fruit marketability would be possible up to 28 days after harvesting, retaining its profile, which is rich in bioactive compounds.


1981 ◽  
Vol 64 (5) ◽  
pp. 1258-1258
Author(s):  
Fredric M Rabel

Abstract When analyzing extracts of pharmaceutical preparations, the chromatographer may place some of the base fats or oils onto the reverse phase analytical column with each injection. This is not a problem if they are washed free from the column periodically. If not cleaned off the column, column efficiency and selectivity can be lost forever. A simple procedure is described for washing columns.


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