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tdairy09: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú, Ó¢ÎÄҲûÓÐÏÈ»ìÔÈ 2015-03-23 08:24:22
tdairy09: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú, Ó¢ÎÄҲûÓÐÏÈ»ìÔÈ 2015-03-23 08:24:22
¿´ÁËһϸñê×¼£¬Õâ¸ö²½ÖèÊÇ´ÓÀÏÍâÎÄÏ×ÀïÖ±½Ó·¹ýÀ´µÄ£¬²»¹ý·µÃ²»¹»×¼È·¡£ÏÂÃæÊÇÔÎÄ£¬È˼ҵı¾ÒâÊÇÏÈ»ìÔȺó¾²Ö÷´Ó¦10min£¬È»ºóÅÂÈÜÒº·Ö²ãÔÙ»ìÔÈÏ£¬²¢ÇÒºãÎÂË®ÓòÖдô»á¶ùʹ¶ÁÊý³ä·ÖÎȶ¨¡£Procedure. Two milliliters of sugar solution containing hetween 10 and 70 y of sugar is pipetted into a colorimetric tube, and 0.05 ml. of 80% phenol (adjust amount according to Figures 9 and 10) is added. Then 5 ml. of concentrated sulfuric acid is ttdded rapidly, the stream of acid being directed against the liquid surface rather than against the side of the test tube in order to obtain good mixing. The tubes are allowed to stand 10 minutes, then they are shaken and placed for 10 to 20 minutes in a xvater bath at 25" to 30" C. before readings are taken. The color is stable for several hours and readings may be made later if necessary. The absorbance of the characteristic yelloworange color is measured at 490 nip for hexoses and 480 nip for pentoses and uronic acids. Blanks are prepared by substituting distilled water for the sugar solution. The amount of sugar may then be determined bj. reference to a standard curve previously constructed for the particular sugar under esamination. |
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