PEMBUATAN FILM HIDROGEL GALAKTOMANAN
IKAT SILANG BORAT DARI GALAKTOMANAN
KOLANG-KALING (
Arenga pinnata
)
DENGAN ASAM BORAT (H
3BO
3)
ABSTRAK
Film hidrogel galaktomanan ikat silang borat telah dibuat dari galaktomanan kolang-kaling (Arenga pinnata) yang diikat silang dengan asam borat (H3BO3). Proses
pemisahan galaktomanan dilakukan dengan metode pemusingan menggunakan alat sentrifuge dengan kecepatan 7000 rpm selama 60 menit dan diekstraksi menggunakan pelarut etanol sehingga diperoleh 8,5545 gram (4,27 %) galaktomanan dari 200 gram kolang-kaling. Ikat silang galaktomanan dengan asam borat dilakukan dengan metode pengadukan dengan hotplate stirrer dengan perbandingan antara galaktomanan dengan asam borat yakni GIB 1 (1:0,05); GIB 2 (1:0,10); GIB 3 (1:0,20); GIB 4 (1:0,30); dan GIB 5 (1:0,40). Hasil analisis FT-IR menunjukkan munculnya pita serapan vibrasi stretching B-O pada bilangan gelombang 1357,89 - 1365,60 cm-1, vibrasi stretching O-H pada daerah bilangan gelombang 3394,72 - 3417,86 cm-1 dan vibrasi bending O-H pada daerah bilangan gelombang 1635,64 - 1643,35 cm-1. Hasil analisis SEM (Scanning Electron Microscopic) pada GIB 4 menunjukkan morfologi permukaan film hidrogel galaktomanan ikat silang borat tampak kasar dan bergelombang disertai adanya sejumlah lembah. Hasil pengukuran ketebalan film hidrogel galaktomanan ikat silang borat diperoleh sebesar 1,42 - 1,98 mm. Hasil pengukuran derajat swelling film hidrogel dalam air suling dan larutan Buffer Phosphate pH 7,4 maksimum pada GIB 2, dalam larutan NaCl 0,9 % mengalami peningkatan, sedangkan dalam larutan HCl 0,1 N hidrogel larut seluruhnya.
Kata Kunci : Hidrogel, Galaktomanan, Ikat silang, Asam borat
THE MAKING OF HYDROGEL FILM OF GALACTOMANNAN
CROSSLINKED BORATE FROM GALACTOMANNAN
KOLANG-KALING (
Arenga pinnata
)
WITH BORIC ACID (H
3BO
3)
ABSTRACT
Hydrogel film of galactomannan crosslinked borate was made from galactomannan kolang-kaling (Arenga pinnata) crosslinking with boric acid (H3BO3). Separation
process of galactomannan had been done by sentrifuged method that used a sentrifuge at a speed 7000 rpm for 60 minutes and extracted with ethanol solvent to obtain 8,5545 gram (4,27 %) of galactomannan from 200 gram kolang-kaling. Crosslinking galactomannan with boric acid had been done by stirring method using a hotplate stirrer with ratio between galactomannans and boric acids were GIB 1 (1:0,05); GIB 2 (1:0,10); GIB 3 (1:0,20); GIB 4 (1:0,30); and GIB 5 (1:0,40). The analysis of functional group by FT-IR showed the vibration of stretching B-O in the area of wave numbers from 1357,89 - 1365,60 cm-1, the vibration of stretching O-H in the area of wave numbers 3394,72 - 3417,86 cm-1, and the vibration of bending O-H in the area of wave numbers 1635,64 – 1643,35 cm-1. The analysis of surface morphology by SEM (Scanning Electron Microcopic) on GIB 4 showed the hydrogel galactomannan crosslinked borate was rough and perforated. The thickness measurements of film hydrogel galactomannan crosslinked borate was 1,42 - 1,98 mm. The swelling degree of hydrogel galactomannan crosslinked borate in distilled water and Buffer Phosphate pH 7,4 maximum in GIB 2, in the solution of NaCl 0,9 % increased, whereas in the solution of HCl 0,1 N dissolved entirely.
Keywords: Hydrogel, Galactomannan, Crosslinked, Boric acid
