Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mengkaji pengaruh penambahan Carbon Quantum Dots (CQDs) dari limbah ampas tahu terhadap karakteristik bioplastik berbasis pati aren dan kitosan. Sampel dibuat dengan variasi konsentrasi CQDs 0%, 1%, 3%, dan 5%. Karakterisasi dilakukan melalui uji FTIR, XRD, AFM, water uptake (WU), water vapor permeability (WVP), kekuatan tarik, elongasi, penghalang UV, dan aktivitas antioksidan. Hasil penelitian menunjukkan penambahan CQDs memperbaiki sifat fisik dan mekanik bioplastik. Formulasi optimal terletak pada konsentrasi 3% (CH/SPS-OII) dengan kekuatan tarik mencapai 63,74 MPa dan nilai WVP terendah sebesar 1,64 × 10⁻⁸ g.s⁻¹·m⁻¹·Pa⁻¹. Sementara itu, konsentrasi 5% (CH/SPS-OIII) menghasilkan perpanjangan tertinggi (103,330%), ketahanan udara terbaik dengan WU terendah (71%), serta aktivitas antioksidan maksimal sebesar 15,3%. Analisis FTIR menunjukkan adanya interaksi ikatan hidrogen tanpa pembentukan gugus fungsi baru, didukung hasil XRD dan AFM yang menampilkan struktur kristal dan morfologi permukaan yang lebih kompak. Pemanfaatan CQDs dari ampas tahu terbukti meningkatkan kinerja bioplastik pati aren-kitosan, sehingga sangat potensial diaplikasikan sebagai kemasan aktif dan cerdas (active and smart packing)

This study aims to investigate the effect of adding Carbon Quantum Dots (CQDs) derived from tofu dregs waste on the characteristics of bioplastics based on sugar palm starch and chitosan. Samples were prepared with varying CQD concentrations of 0%, 1%, 3%, and 5%. Characterization was conducted through FTIR, XRD, and AFM analyses, as well as tests for water uptake (WU), water vapor permeability (WVP), tensile strength, elongation, UV barrier properties, and antioxidant activity. The results indicate that the addition of CQDs improved the physical and mechanical properties of the bioplastics. The optimal formulation was achieved at a concentration of 3% (CH/SPS-OII), yielding a tensile strength of 63.74 MPa and the lowest WVP value of 1.64 × 10⁻⁸ g·s⁻¹·m⁻¹·Pa⁻¹. Meanwhile, the 5% concentration (CH/SPS-OIII) resulted in the highest elongation (103.330%), superior moisture resistance with the lowest WU (71%), and maximum antioxidant activity of 15.3%. FTIR analysis revealed hydrogen bonding interactions without the formation of new functional groups; this was supported by XRD and AFM results, which showed a more compact crystalline structure and surface morphology. The utilization of CQDs from tofu dregs proved to enhance the performance of sugar palm starch-chitosan bioplastics, demonstrating significant potential for application in active and smart packaging.