{"title":"The effect of chemical modification using citraconic anhydride on the stability of α-amylase from Aspergillus fumigatus","authors":"Yandri Yandri, Lupia Widya Astuti, Hendri Ropingi, Tati Suhartati, Bambang Irawan, Sutopo Hadi","doi":"10.1515/pac-2023-1138","DOIUrl":null,"url":null,"abstract":"The purpose of this research is to improve the stability of α-amylase from <jats:italic>Aspergillus fumigatus</jats:italic> by chemical modification with citraconic anhydride. The α-amylase was isolated using a centrifugation technique, followed by purification using precipitation and dialysis of ammonium sulfate salt. The experimental results demonstrate that the stability of purified α-amylase is 13.41 times higher than that of the crude extract. A significant increase in the optimum temperature was also achieved, in which the optimum temperature of 50 °C was found for native α-amylase, while for modified α-amylase, the optimum temperature of 60 °C was found. Similarly, an increase in half-life was also evident, which is 38.72 min found for the native enzyme to 256.67–330.00 min for modified α-amylase, depending on the volume of citraconic anhydride used. Modification also resulted in increased free energy values (<jats:italic>ΔG</jats:italic> <jats:sub>i</jats:sub>) from 104.348 for the native enzyme to 109.585–110.281 kJ mol<jats:sup>−1</jats:sup> for modified α-amylase, indicating that modified α-amylase is stiffer than native α-amylase. The results obtained in this work demonstrate that citric anhydride is a very promising modifying agent to improve the stability and performance of α-amylase enzyme isolated from <jats:italic>A. fumigatus</jats:italic>. The findings of this study also offer an opportunity for the application of citric anhydride for other enzymes.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":2.0000,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Pure and Applied Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1515/pac-2023-1138","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The purpose of this research is to improve the stability of α-amylase from Aspergillus fumigatus by chemical modification with citraconic anhydride. The α-amylase was isolated using a centrifugation technique, followed by purification using precipitation and dialysis of ammonium sulfate salt. The experimental results demonstrate that the stability of purified α-amylase is 13.41 times higher than that of the crude extract. A significant increase in the optimum temperature was also achieved, in which the optimum temperature of 50 °C was found for native α-amylase, while for modified α-amylase, the optimum temperature of 60 °C was found. Similarly, an increase in half-life was also evident, which is 38.72 min found for the native enzyme to 256.67–330.00 min for modified α-amylase, depending on the volume of citraconic anhydride used. Modification also resulted in increased free energy values (ΔGi) from 104.348 for the native enzyme to 109.585–110.281 kJ mol−1 for modified α-amylase, indicating that modified α-amylase is stiffer than native α-amylase. The results obtained in this work demonstrate that citric anhydride is a very promising modifying agent to improve the stability and performance of α-amylase enzyme isolated from A. fumigatus. The findings of this study also offer an opportunity for the application of citric anhydride for other enzymes.
期刊介绍:
Pure and Applied Chemistry is the official monthly Journal of IUPAC, with responsibility for publishing works arising from those international scientific events and projects that are sponsored and undertaken by the Union. The policy is to publish highly topical and credible works at the forefront of all aspects of pure and applied chemistry, and the attendant goal is to promote widespread acceptance of the Journal as an authoritative and indispensable holding in academic and institutional libraries.