SINTESIS DAN KARAKTERISASI SELULOSA NANOKRISTAL DARI RUMPUT LAUT Gracilaria sp.

    Nurvindhia Istiqomah Putri, - (2024) SINTESIS DAN KARAKTERISASI SELULOSA NANOKRISTAL DARI RUMPUT LAUT Gracilaria sp. S1 thesis, Universitas Pendidikan Indonesia.

    Abstract

    Rumput laut Gracilaria sp. merupakan salah satu jenis rumput laut merah (Rhodophyta), dengan >185 spesies tersebar secara global. Rumput laut Gracilaria sp berfungsi sebagai sumber polisakarida yang sangat baik. Gracilaria mengandung karbohidrat dan galaktan yang banyak digunakan untuk pembuatan agar, selain itu Grcailaria mengandung selulosa. Penggunaan CNC sebagai bahan pengisi penguat pada nanokomposit berbasis polimer telah menarik banyak perhatian di bidang nanoteknologi. Telah dibuktikan secara luas bahwa penggabungan CNC ke dalam biopolimer dapat menghasilkan bahan nanokomposit dengan sifat mekanik, optik, termal, dan penghalang yang tinggi. Sintesis selulosa nanokristal dapat dilakukan dengan cara alkalinisasi, hidrolisis asam dan pemutihan. Penelitian bertujuan untuk mengetahui pengaruh perlakuan suhu hidrolisis asam terdahap karakteristik rendemen, FTIR, TGA, XRD, FESEM. Hasil dari penelitian ini ekstraksi selulosa nanokristal dengan perlakuan suhu 40°C, 50°C, dan 60°C pada hidrolisis asam mempengaruhi karakteristik rendemen yang dihasilkan, dengan hasil masing- masing 22,36%, 23,14% dan 25,08%. Analisis FTIR menunjukkan bagian amorf berkurang selama proses hidrolisis asam, dan perlakuan suhu pada hidrolisis asam tidak mempengaruhi struktur gugus selulosa. Analisis termal menunjukkan bahwa selulosa dengan perlakuan suhu 40oC memiliki kestabilan termal yang lebih baik dibandingkan dengan selulosa perlakuan suhu 50oC dan 60oC. Indeks kristalinitas selulosa nanokristal Gracilaria sp. perlakuan suhu 40°C, 50°C, dan 60°C masing-masing adalah 47,38%, 38,51% dan 38,61%. Hasil morfologi perlakuan suhu 40°C menunjukkan morfologi lembaran yang lebih rapat dan halus daripada C. Gra 50°C dan 60°C. Kata Kunci: Gracilaria sp., Selulosa Nanokristal, Perlakuan Suhu Gracilaria sp. is a type of red seaweed (Rhodophyta) with >185 species distributed globally. Gracilaria sp seaweed serves as an excellent source of polysaccharides. Gracilaria contains carbohydrates and galactans that are widely used for making agar, in addition Grcailaria contains cellulose. Using CNCs to reinforce filler materials in polymer-based nanocomposites has attracted much attention in nanotechnology. It has been widely demonstrated that incorporating CNCs into biopolymers can produce nanocomposite materials with high mechanical, optical, thermal, and barrier properties. Cellulose nanocrystals can be synthesized by alkalinization, acid hydrolysis, and bleaching. The study aims to determine the effect of acid hydrolysis temperature treatment on yield characteristics, FTIR, TGA, XRD, and FESEM. The results of this study showed that the extraction of cellulose nanocrystals with temperature treatments of 40°C, 50°C, and 60°C in acid hydrolysis affected the characteristics of the resulting yield, with results of 22.36%, 23.14%, and 25.08%, respectively. FTIR analysis showed that the amorphous part decreased during the acid hydrolysis process, and the temperature treatment in acid hydrolysis did not affect the structure of cellulose groups. Thermal analysis showed that cellulose treated at 40°C had better thermal stability than cellulose treated at 50°C and 60°C. The crystallinity index of Gracilaria sp. nanocrystalline cellulose treated at 40°C, 50°C, and 60°C was 47.38%, 38.51%, and 38.61%, respectively. The morphology results of the 40°C temperature treatment showed a tighter and smoother sheet morphology than C. Gra 50°C and 60°C. Keywords: Gracilaria sp., Nanocrystalline Cellulose, Temperature Treatment

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    Official URL: https://repository.upi.edu/
    Item Type: Thesis (S1)
    Additional Information: https://scholar.google.com/citations?user=iGgkXe0AAAAJ&hl=en ID SINTA Dosen Pembimbing Himawan Prasetiyo: 6745744 Mad Rudi: 6746212 Dina Fransiska: 6786504
    Uncontrolled Keywords: Gracilaria sp., Selulosa Nanokristal, Perlakuan Suhu Gracilaria sp., Nanocrystalline Cellulose, Temperature Treatment
    Subjects: L Education > L Education (General)
    Divisions: UPI Kampus Serang > S1 Pendidikan Kelautan dan Perikanan
    Depositing User: Nurvindhia Istiqomah Putri
    Date Deposited: 16 Jun 2025 04:27
    Last Modified: 16 Jun 2025 04:27
    URI: http://repository.upi.edu/id/eprint/127500

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