346 DATE SUGAR INDUSTRY IN BENGAL. 



Rotatory power. 6'512 gms. were dissolved in water and made 

 up to 50 c.c. The solution was then read in a Schmidt and Hsensch 

 Saccharimeter. The following readings were obtained : 



= Sucrose. 

 Sugar from date palm .. .. .. 49'9 99'80 



Cane sugar . . , . . . . . 49'7 99'60 



Theory for pure cane sugar . . . . . . 50'0 lOO'OO 



The solutions were then inverted by adding 1/10 of their volume 

 of hydrochloric acid and heating to 68 C. in 15 minutes. 

 The invert readings uncorrected for dilution were : 



Sugar from date palm .. .. 12'6 (t - 30 C.) 



Cane sugar .. .. .. 12'6 (t =30' C.) 



Melting point. The melting points of the above two sugars 

 and of some Tate's cube sugar were determined under exactly similar 

 conditions. The following results corrected, were obtained : 



Sugar from date palm . . . . . . . . 181 C. 



Cane sugar (as above) . . . . . . . . 182 C. 



Tate's cube sugar . . . . . . . . . . 182 C C. 



It may be mentioned that the melting point of sucrose is 

 given in all text-books as 163 161 C. Bailstein also gives 160, but 

 mentions that 180 was found by Peligot. Under no circumstances 

 were we able to get sucrose to melt at 160 161, and this statement 

 of the melting point of sucrose in text-books needs correction. 



The sugar separated from the date palm is therefore shewn to 

 be sucrose as in the case of cane sugar. 



Fifty gms. of date gur were dissolved in water. A determin- 

 ation of the amount of reducing sugar present was made, and this 

 amounted to about 7 per cent. 



To the above a solution of phenyl hydrazin acetate was added 

 containing 12 gms. phenyl hydrazin, 12 gms. of glacial aceiic acid 

 and 30 c.c. of water. The liquid was heated inside a water bath for 

 2J hours. An osazone began to separate after 25 30 minutes. 

 The crystals were filtered off at the pump and washed with water 

 and then alcohol and dried. _The weight of the crude osazone was 

 about 10 gms. 



