Pickles have a long shelf life and do not get spoiled for months, why?
Plenty of salt and cover of oil act as preservatives. These food preservatiues prevent spoilage of food due to microbial growth. Salt and oil do not allow moisture and air to enter the material and hence bacteria cannot thrive on them. Therefore, pickles do not get spoiled for months together.
What is the difference between saccharin and saccharic acid?
Saccharin is an artificial sweetening agent. It is about 550 times as sweet as cane sugar. It is excreted from the body in urine unchanged. It appears to be entirely inert and harmless when taken. Its use is of great value to diabetic people who need to control intake of calories.
On the other hand, saccharic acid, is a dibasic acid obtained by the bacterial oxidation of glucose in the mouth or by conc. $\mathrm{HNO}_3$ in the laboratory.
Name an artificial sweetener which is derivative of sucrose.
Sucralose is trichloro derivative of the sucrose. Its appearance and taste are like sugar. It is stable at cooking temperature. Sucralose contributes zero calories to the diet, compared with sucrose, which contributes 16 calories per teaspoon. Structure of sucralose is
Name two $\alpha$-amino acids which form a dipeptide which is 100 times more sweet than cane sugar ?
Aspartame is the most successful and widely used artificial sweetener. It is methyl ester of dipeptide formed from aspartic acid and phenylalanine. Its use is limited to cold foods and soft drinks because it is unstable at cooking temperature.
Structure of aspartame is
Aspartame is unstable at cooking temperature, where would you suggest aspartame to be used for sweetening?
Aspartame is used in cold foods and soft drinks. It is an artificial sweetening agent.