Glucose solutions

Reduction of ammoniacal silver nitrate. Place 2 ml. of dilute silver nitrate solution in a clean test-tube. Add 1 drop of NaOH solution and then add dil. ammonia drop by drop until the precipitate formed by the NaOH is just not redissolved. Now add 1-2 ml. of glucose solution and place the test-tube in a water-bath at 50-60° a silver mirror is produced in 1 - 2 minutes. 

Reduction of Fehling s solution. Add 5 ml. of the glucose solution to 5 ml. of Fehling s solution and boil. Reduction takes place and a precipitate of cuprous oxide is formed the latter is at first yellow but may become red on standing. 

Repeat the titrations until consistent values (i.e., values which do not differ by more than 0 1 ml. of glucose solution) are obtained. Then calculate the weight of glucose equivalent to 1 ml. of the Fehling s solution. 

Chemical Designations - Synonyms Corn Sugar Solution Glucose Solution Grape Sugar Solution Chemical Formula C HuO —HjO. 

Add a few diniis of glucose solution to half a test-tube of aininonio-siher nitrate solution and jdaec the IcsUUibc in hot water.. A minor of inetallir siU er is formed... 

Mix a few drops of a glucose solution with a few drops of an alcoholic solution of n-naphthol and poui slowly down the side of the test-tube a few drops of cone, sulphunc acid. A violet colouration is produced. (Molisch s reaction.) See AppendiXt p. 271. 

Refer to Problem 55 and determine the concentration of a glucose solution isotonic with blood. 

Medium containing up to 35% glucose is steam sterilised by a steam jacket around a conventional stirred tank reactor. pH adjustment starts as the medium cools and is maintained at 65. Vigorous aeration is again required. Inoculation is usually by using a mycelial suspension. Under these conditions a 30% glucose solution can be almost quantitatively converted to sodium gluconate within 36 hours. 

The volume of reactor without beads was 1.4 1. The column was loaded with the solidified uniform beads of S. cerevisiae. The void volume of the reactor was 660 ml when it was packed with immobilised beads. The growth of beads with different proportions of column packing is shown in Figure 8.9. A fresh feed of 10 g l 1 glucose solution was pumped from the bottom of the reactor. The optimum amount of packing obtained was 65-70% of the reactor volume. The trend of the collected data resembles the growth curve of yeast in... 

Human blood has an osmotic pressure relative to water of approximately 7.7 atm at body temperature (37°C). In a hospital, intravenous glucose (C6H)2Ofc) solutions are often given. If a technician must mix 500.111L of a glucose solution for a patient, what mass of glucose should be used ... 

Pressure drops have been measured in a Corning glass H EX reactor with pressure sensors located on reactive and utiHty Hnes and estimated for different fluids (water, glucose solutions) at various flow rates, from 2 to 101 h, and various temperature levels (from 20 to 50°C). The results are presented in Figure 12.6. 

Isotonic solutions, by definition, exert equal osmotic pressure. Therefore, for blood is the same as I I for the glucose solution. We can calculate from Equation after converting the concentration moles per liter —MRT and... 

Recently Chao and Gua9 employed polymer microrings with sharp asymmetrical resonance for measuring glucose solutions. They found a detection limit of 24 mg/dl corresponding to a 3 x 10 5 index change. 

Fig. 1.33. DTA plot of a 50 % glucose solution, frozen at 3 °C/min, during rewarming.

Fig. 1.48. Results of annealing (thermal treatment) on the formation of ice in a 60 % fructose solution (1) and in a 60 % glucose solution (2).

Classic beri-beri, rarely seen in the United States and Europe, except in alcoholism (P4), is endemic in the Far East because of the prevalent diet of decorticated rice (F6). It occurs in two forms wet beri-beri, characterized by edema and cardiovascular symptoms (G6), and dry beri-beri with peripheral neuritis, paralysis, and atrophy of the muscles. Conditions which may predispose to deficiency by increasing thiamine requirements are pregnancy (see section 2.4), and lactation, hyperthyroidism, malignant disease, febrile conditions, increased muscular activity, high carbohydrate diets, and parenteral administration of glucose solutions. A constant supply of thiamine is required for optimal nutrition because storage in the liver and elsewhere is limited. Thiamine is synthesized by bacteria in the intestinal tract of various animals, but this is not a dependable source for man. 

FIG. 7 Effect of 90-min osmotic dehydration (OD) in 40% (w/w) glucose solution at 25 °C at atmospheric pressure on drying rates (M/M0 moisture content/initial moisture content) at 60 °C of infinite plate-shaped mango (Nieto et al., 2001) and apple (Nieto et al., 1998). 

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