Amino acids profile of Two Chinese nuts (Juglans sigillata and Castanea mollissima ) in local markets of Kurdistan region/Iraq using HPLC
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Abstract
Aim: current study was aimed to study the amino acid contents of two Chinese nuts, walnuts (Juglans sigillata Dode.) and chestnuts (Castanea mollissima Blume.) from the local market of the Kurdistan region / Iraq.
Methodology: Walnut fruits (Juglans sigillata) and chestnut fruits (Castanea mollissima) were collected from local market in the Kurdistan region / Iraq, samples were collected, dried and ground. one milgram of each sample was weighed, then dissolved in 10 ml High Performance Liquid Chromatography (HPLC) methanol, the sample was shaken and agitated in an ultrasonic bath for 10 minutes , then concentrated by evaporating the solvent with a stream of liquid N2 until it reached 1 ml, filtrated the liquid sample on deposable sep-pak cartridge filter ( supleco Co, Ltd),then 20 ml were injected on HPLC column .
Results: firstly current study can identified thirteen amino acids from chestnuts but there are only eight amino acids were identified from walnuts. Secondly, there are big different between them in the percentage of amino acids where valine is appear in the highest percentage which record 69.43 %, while it recorded 6.32% in chestnut fruit , While threonine showed the highest percentage in chestnuts arrived to 54.09% compared to only 3.72% in walnuts fruits.
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