很多藥是低純度hydrogencloride 的，內服外用都有

Hydrochloric acid (HCl), a strong acid, is a crucial component of gastric acid in the human stomach. It plays a vital role in digestion by creating an acidic environment, activating enzymes that break down proteins, and helping to kill bacteria. Specifically, it converts pepsinogen into pepsin, an enzyme that digests proteins, and helps in the absorption of essential nutrients. 

 

Here's a more detailed look at its functions: 

• Protein Digestion:

  HCl denatures proteins, preparing them for digestion by pepsin, an enzyme that breaks down proteins into smaller peptides. 

   

• Enzyme Activation:

  HCl is necessary for the activation of pepsinogen, the inactive precursor to pepsin, which is essential for protein breakdown. 

   

• Infection Control:

  The acidic environment created by HCl helps to kill bacteria and other pathogens that enter the stomach with food. 

   

• Nutrient Absorption:

  HCl aids in the absorption of certain nutrients, including iron, which is more readily absorbed in an acidic environment. 

   

• Stomach Protection:

  The stomach is protected from the corrosive effects of HCl by a thick layer of mucus that coats the stomach lining, preventing the acid from damaging the stomach walls.