Pengaruh Penambahan Polisorbat 20 terhadap Stabilitas Human Serum Albumin (HSA) Setelah Paparan Agitasi dan Kemampuan Pengikatannya dengan Natrium Diklofenak
Unaisah, apt. Marlyn Dian Laksitorini, M.Sc., Ph.D.; Dr. apt. Nunung Yuniarti, M.Si.
2026 | Skripsi | FARMASI
Human serum albumin (HSA) is widely studied due to its important role in biological systems. Around 40% of FDA-approved drugs have poor aqueous solubility. HSA-based systems can improve drug solubility, but the protein may undergo processes that reduce its function. This study aimed to evaluate the effect of adding 0.01% polysorbate 20 on the conformational changes of HSA after agitation, its binding ability to diclofenac sodium, and its interaction with Congo red.
Protein conformational stability was analyzed using UV spectrophotometry to assess turbidity and wavelength shifts. Interaction with Congo red was evaluated using a microplate reader and optical microscopy at 10× magnification. Binding activity was determined based on the amount of free diclofenac sodium outside the dialysis membrane. Data were analyzed using one-way ANOVA at a 95% confidence level with GraphPad Prism 10.
The results showed that adding 0.01% polysorbate 20 to agitated HSA tended to inhibit protein aggregation, helping maintain structural stability. However, no significant effects were observed on binding with diclofenac sodium or interaction with Congo red (p > 0.05), suggesting that aggregation remained in an early stage.
Kata Kunci : HSA, polisorbat 20, stabilitas konformasi, uji pengikatan, natrium diklofenak