Limbah cangkang kepiting bakau memiliki potensi sebagai bahan baku untuk pembuatan nanopartikel kitosan. Tujuan penelitian ini adalah mengetahui mutu kitosan cangkang kepiting bakau (Scylla sp.) melalui analisis kadar air, abu, nitrogen total, derajat deasetilasi dan morfologinya serta mendapatkan karakteristik nanopartikel kitosan melalui analisis Particle Size Analyzer (PSA) dan Scanning Electron Microscope Energy Dispersive X-ray (SEM-EDX). Metode yang digunakan pada penelitian ini adalah deskriptif kuantitatif. Hasil dari penelitian menunjukkan bahwa rendemen kitosan cangkang kepiting bakau (Scylla sp.) sebesar 11,56%. Mutu kitosan menunjukkan nilai kadar air 0,14%, kadar abu 0,01% nitrogen total 0,77%. Derajat Deasetilasi yang diperoleh sebesar 76% sesuai dengan SNI No.7949 Tahun 2013, Protan Laboratory. Hasil karakterisasi nanopartikel kitosan dengan analisis Particle Size Analyzer menghasilkan ukuran sebesar 35,20nm, dengan Polidispersity Indeks (PI) 0,274 dan intensitas 13,54 nm. Morfologi kitosan dan nanopartikel kitosan berbentuk tidak seragam (amorf).
Kata kunci: Derajat Deasetilasi, FTIR, Morfologi, PSA, SEM-EDX

The waste of mangrove crab shells had potential as a raw material for the manufacture of chitosan nanoparticles. The purpose of this study was to determine the quality of chitosan shells of mangrove crabs (Scylla sp) through analysis of the water content, Ash, total nitrogen, degree of deacetylation, and morphology and to obtain the characteristics of chitosan nanoparticles through Particle Size Analyzer (PSA) analysis and Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX). The method used in this research was descriptive quantitative. The result of the study showed that the yield of chitosan shells of mangrove crab (Scylla sp.) was 11.56%. The quality of chitosan showed the value of water content 0.14%, Ash content 0.01%, total nitrogen 0.77%. The degree of deacetylation obtained was 76% under SNI No. 7949 of 2013, Protan Laboratory. The result of the characterization of chitosan nanoparticles with Particle Size Analyzer analysis resulted in a zise of 35.20 nm, with a Polidispersity Index (PI) of 0.274 and intensity of 13.54 nm. The morphology of chitosan and chitosan nanoparticles was different ( amorphous ). Keywoards: Degree of Deacetylation, FTIR, Morphology, PSA, SEM-EDX