Ptyalin work on ph 6.8 that is nearly equal to 7 .So we can say it works on almost neutral medium.

Explanation:
Ptyalin is an enzyme that is present in saliva and is responsible for the breakdown of carbohydrates, particularly starch. The pH level of the mouth varies depending on various factors such as food intake, oral hygiene, and other physiological factors. However, the pH level of the mouth is usually around 6.5 to 7.5, which is neutral or slightly acidic. Therefore, Ptyalin works in a neutral or faintly acidic medium.

Saliva:
Saliva is a watery fluid that is secreted by the salivary glands in the mouth. It contains various enzymes, mucus, and other substances that aid in the digestion of food. Saliva is responsible for moistening the food and making it easier to swallow. It also contains enzymes that break down carbohydrates, proteins, and fats in the food.

Ptyalin:
Ptyalin is an enzyme that is present in saliva and is responsible for the breakdown of carbohydrates, particularly starch. It hydrolyzes the alpha-1,4 glycosidic bonds in the starch molecule, breaking it down into smaller glucose molecules. This process is known as amylolysis.

pH level of the mouth:
The pH level of the mouth varies depending on various factors such as food intake, oral hygiene, and other physiological factors. However, the pH level of the mouth is usually around 6.5 to 7.5, which is neutral or slightly acidic. This pH level is necessary for the proper functioning of enzymes such as ptyalin, which works in a neutral or faintly acidic medium.

Conclusion:
In conclusion, Ptyalin is an enzyme that is present in saliva and is responsible for the breakdown of carbohydrates, particularly starch. It works in a neutral or faintly acidic medium, which is the pH level of the mouth. The pH level of the mouth is usually around 6.5 to 7.5, which is neutral or slightly acidic.