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BAB V
KESIMPULAN DAN SARAN
5.1 Kesimpulan
Berdasarkan hasil penelitian ini didapatkan beberapa kesimpulan sebagai berikut : 1. Pati sagu dapat direaksikan dengan minyak goreng bekas 10x penggorengan dalam
pelarut CO2 bertekanan menghasilkan pati ester, namun diperlukan pre-treatment untuk mengurangi terjadinya reaksi samping.
2. Nilai Ester Content terbesar yaitu 195,7 (DS=0,035) diperoleh pada kondisi 100oC dengan rasio minyak/pati sebesar 2 mol/mol AGU. Hasil ini masih perlu ditingkatkan agar mencapai nilai DS yang umum digunakan dalam pembuatan bioplastik, yaitu 1,5-2,5.
3. Nilai Ester Content terkecil yaitu 85,4 diperoleh pada kondisi 120oC dengan rasio minyak/pati sebesar 4 mol/mol AGU.
4. Analisa FTIR menunjukkan adanya penambahan jumlah gugus C=O pada pati ester, yaitu pada rentang 1720-1750 cm-1
5. Analisa HNMR menunjukkan adanya gugus-gugus asam lemak pada pati ester yaitu pada rentang 0,7-2,3 ppm.
6. Analisa XRD menunjukkan terjadinya perubahan kristalinitas pada pati ester.
7. Analisa SEM menunjukkan terjadinya penggumpalan antar granula pati ester.
5.2 Saran
Beberapa saran yang dapat diberikan untuk penelitian selanjutnya adalah :
1. Dilakukan pencegahan terjadinya reaksi hidrolisis pada minyak goreng bekas dengan cara mengurangi kadar air pada sistem.
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2. Penggunaan temperatur 100oC untuk kondisi operasi karena pada temperatur tersebut nilai EC yang maksimum.
3. Pengkajian kembali besar rasio minyak/pati untuk didapatkan hasil optimum pada perolehan EC dengan memakai rasio reagen di bawah 2 mol/mol AGU.
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