Electronic Theses and Dissertation

Carbon Quantum Dots (CQDs) sebagai nanomaterial karbon dapat diproduksi dari berbagai bahan organik yang ramah lingkungan, salah satunya dari limbah kulit buah naga merah yang memiliki banyak potensi sebagai bahan produk kosmetik. Penelitian ini bertujuan untuk memformulasikan serta menguji efektivitas krim sunblock yang mengandung bahan aktif CQDs limbah kulit buah naga merah. Formulasi krim sunblock yang dihasilkan kemudian diuji pH, homogenitas, organoleptik, viskositas, daya sebar, daya proteksi terhadap kondisi basa, SPF,dan UV blocking. Pengujian SPF dan UV blocking dilakukan dengan menghitung nilai absorbansi dengan panjang gelombang yang didapatkan dari pengukuran menggunaka spektrofotometer. Hasil dari penelitian menunjukkan kelima formulasi krim sunblock CQDs kulit buah naga merah memiliki rentang pH 6,2-6,9, bersifat homogen, tingkat penerimaan yang baik, dan sediaan krim sunblock konsentrasi 2% dan paling disukai pada parameter warna, aroma, dan tekstur, viskositas 3010,3-5827,4 cP, daya sebar pada rentang 5-6 cm, dan mampu melindungi kulit dari kondisi basa. Hasil Uji SPF menunjukkan bahwa kelima formulasi memiliki nilai SPF kategori tinggi dan mampu memblokir sinar UV pada panjang gelombang 250-300 nm. Berdasarkan hasil penelitian dapat disimpulkan bahwa krim sunblock yang paling efektif adalah formulasi 4 yang mengandung CQDs kulit buah naga merah sebesar 8% dengan nilai SPF adalah 35.

Carbon Quantum Dots (CQDs) as carbon nanomaterials can be produced from various environmentally friendly organic materials, one of which is from red dragon fruit peel waste which has a lot of potential as a material for cosmetic products. This study aims to formulate and test the effectiveness of sunblock cream containing active ingredients CQDs from red dragon fruit peel waste. The resulting sunblock cream formulation was then tested for pH, homogeneity, organoleptic, viscosity, spreadability, protection against alkaline conditions, SPF, and UV blocking. SPF and UV blocking tests are carried out by calculating the absorbance value with the wavelength obtained from the measurement using a spectrophotometer. The results of the study showed that the five formulations of CQDs sunblock cream of red dragon fruit peel had a pH range of 6.2-6.9, were homogeneous, had a good acceptance rate, and the sunblock cream preparation had a concentration of 2% and was most preferred on color, aroma, and texture parameters, viscosity of 3010.3-5827.4 cP, dispersion power in the range of 5-6 cm, and was able to protect the skin from alkaline conditions. The results of the SPF test show that all five formulations have a high category SPF value and are able to block UV rays at a wavelength of 250-300 nm. Based on the results of the study, it can be concluded that the most effective sunblock cream is formulation 4 which contains CQDs of red dragon fruit peel of 8% with an SPF value of 35.