Temperature, degrees C.

Grams of maltose in 100 grams of solution, or per cent

Grams of maltose dissolved by 100 grams of water

0.6

36.1

56.5

21.0

44.1

78.9

29.6

48.0

93.2

34.4

49.6

98.4

43.5

55.3

123.9

49.4

58.3

139.8

54.2

60.2

151.4

59.8

63.7

175.2

66.3

66.7

200.0

74.2

72.3

261.5

87.0

79.3

383.8

96.5

85.1

569.3

Solubility of Lactose in Water (Hudson)

Final Solubility

Temperature, degrees C.

Grams of lactose per 100 grams of solution, or per cent

Grams of lactose dissolved by 100 grams of water

0

10.6

11.9

15

14.5

16.9

25

17.8

21.6

39

24.0

31.5

49

29.8

42.4

64

39.7

65.8

74

46.3

86.2

89

58.2

139.2

Dextrose. Dextrose and levulose are the only monosaccharid sugars used in cookery to any extent. Dextrose has in recent years been put on the market in crystalline form under the trade name of "Cerelose." Combs and Bele give the solubility of "Cerelose" as shown in Table 8.

Table 8 Solubility of "Cerelose" in Water (Combs and Bele)

Temperature, degrees C.

Grams of "Cerelose" per

100 grams of solution, or per cent

Grams of "Cerelose" dissolved by 100 grams of water

20

49.7

83.1

63

73.7

281.1

Thus at room temperature about 1 part of "Cerelose" is soluble in 1 part of water. "Cerelose" is less soluble than sucrose and goes into solution at a slower rate.

The solubility of dextrose limits its use in cookery to a certain extent. Jellies average about 60 to 70 parts of sugar by weight and 30 to 40 parts of liquid or juice. Dextrose at room temperature is soluble in water to the extent of 1 part of dextrose to 1 part of water. Since the finished jellies average over 50 per cent of sugar, when dextrose alone is used in jelly it soon begins to crystallize after the jelly is cooled. If the jelly is not covered it crystallizes very rapidly.

Levulose. Levulose is very soluble. It has a greater solubility than sucrose. Since it is very soluble it must be present in very large quantities before it crystallizes and is therefore very hard to crystallize. The data in the table for the solubility of levulose are obtained from the results of Jackson, Silsbee and Proffitt. The data in the third column are computed from the grams of levulose soluble in 100 grams of solution.