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A suspension of nicotinic acid (3.60 g, 29.24 mmol) in DI water (120 mL) was heated to 70-80' C. Glutamic acid (2.22 g, 15.1 mmol) was added to it and continued heating. Once the whole material was dissolved a solution of Chromium chloride (CrC1,.6H20, 4.05 g, 15.2 mmol) in DI water (20 mL) was added to it. The mixture was stirred at 70-80' C. for 9h and cooled to room temperature, frozen at -80' C. and lyophilized. ÉÏÊö¹ý³ÌÖУ¬ÖƱ¸³öµÄ¸õÅäºÏÎΪʲôҪ½øÐÐÁãÏÂ80¶ÈÀ䶳Ĩ£¿ÕâÒ»²½µÄ×÷ÓÃÊÇʲô£¿ |
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