Pectin, which is responsible for the firmness and softness of fruits, is mainly composed of which acid unit?

The correct answer is Galacturonic acid.Key Points

• Pectin is a complex carbohydrate that is found in the cell walls of plants and is responsible for the firmness and softness of fruits.
• The main acid unit that makes up pectin is galacturonic acid, which is a sugar acid that is derived from glucose.
• Pectin is made up of complex polysaccharides, which are widely distributed in the green parts of terrestrial plants and found in the primary cell walls of plants.
• The main element of the middle lamella, where pectin binds cells, is pectin.

Additional Information

• Aspartic acid is an amino acid that is not found in pectin, but is found in proteins.
  • Lentils, soybeans, garbanzo beans, and other legumes are plant sources of aspartic acid. 
• Lactic acid is a simple organic acid that is produced by bacteria during fermentation and is not found in pectin.
  • Our body creates lactic acid when our cells digest carbohydrates for energy.
• Glutamic acid is an amino acid that is not found in pectin, but is found in proteins.
  • It transforms into glutamate inside the body.
  • This substance aids in the transmission and reception of information between brain nerve cells.​