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2. Long-lasting Relief The viscosity of HPMC allows the drops to stay in contact with the eye surface for extended periods, providing longer-lasting hydration compared to lower-viscosity alternatives.

Hydroxyethyl starch is synthesized from natural starch sources such as corn and potatoes. The process involves introducing hydroxyethyl groups into the starch molecule, resulting in a product that retains the biocompatibility of natural starch while providing desirable properties for medical applications. HES is characterized by its high molecular weight, which can be adjusted during production to create different formulations that suit varying clinical needs. The viscosity and solubility of HES can also be modified, making it adaptable for different therapeutic contexts.

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HPMC can also play a role in modulating pH in various applications. For instance, in certain formulations, HPMC can help stabilize pH during storage or usage, thereby prolonging the shelf life of products. Its ability to bind water allows it to retain moisture and prevent degradation of sensitive compounds, thereby reducing pH fluctuations.