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   lipase-catalyzed green synthesis of starch–maleate monoesters and its characterization  
   
نویسنده gill abid nazir ,iftikhar areeba ,rashid ayoub ,amin muhammad ,khan rana rashad mahmood ,rafique hafiz m. ,jelani seemal ,adnan ahmad
منبع journal of the iranian chemical society - 2018 - دوره : 15 - شماره : 9 - صفحه:1939 -1945
چکیده    The present study reports the green synthesis of starch–maleate (sm) at ambient temperature in solvent-free system using rhizopus arrhizus lipase as a biocatalyst and maleic acid (ma) as an esterification agent. the synthetic scheme was found to be efficient, economical, and ecofriendly. the newly synthesized sm samples were characterized using fourier transform infrared (ftir) and proton nuclear magnetic resonance (1h nmr) spectroscopic techniques. the degree of substitution (ds) was found in the range of 0.53–0.62. moreover, ds was found to be temperature and time-dependent. x-ray diffraction (xrd) exhibited that maleation did not change the crystalline nature of native starch. scanning electron microscopy (sem) revealed that size of sm granules was in the range of 4–18 µm. the activation energy (ea) of sm formation was calculated to be 42.94 kcal mol−1 which clearly indicated the effective and rapid interaction of functional groups. hence, the solvent-free solid-state synthetic methodology proved to be excellent for the synthesis of novel biomaterials with appreciable high ds for drug delivery and sorption of heavy metal ions from water.
کلیدواژه corn starch ,lipase ,maleic acid ,starch–maleate
آدرس government college university, department of chemistry, pakistan, government college university, department of chemistry, pakistan, government college university, department of chemistry, pakistan, government college university, department of chemistry, pakistan, government college university, department of chemistry, pakistan, university of the punjab, department of physics, pakistan, foreman christian college, department of chemistry, pakistan, government college university, department of chemistry, pakistan
 
     
   
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