Dwiningsih , Tatik (2005) Pengaruh zat warna Cochineal Reda terhadap kekuatan tarik dan kristalinitas Nata de Coco. Undergraduate thesis, FMIPA UNDIP.
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Abstract
Nata de coco merupakan hasil fermentasi Acetobacter xylinum dalam s bstrat air kelapa yang mengandung gula. Satu hal yang penting dalam industri nitta de coca adalah penambahan zat warna sebagai penarik minat konsumen. P nelitian ini bertujuan untuk memodifikasi medium biopolimerisasi dengan zat ama Cochineal Red A dan menentukan penganthnya terhadap kekuatan tank dan stalinitas nata de coco. Zat wama Cochineal Red A dengan variasi konsentrasi ditambahkan kedalam edia biopolimerisasi kemudian dipanen setelah delapan hari. Sampel nata de coca d analisis dengan spektroskopi IR, uji tensile strength dan XRD kemudian d bandingkan dengan nata de coca tanpa zat warna. Spektra FTIR produk selulosa nata de coca dengan zat warna telah enunjukkan penambahan jumlah ikatan hidrogen dengan bertatnbahnya konsentrasi zat warna. Dari data XRD diketahui bahwa penambahan zat wama ochineal Red A meningkatkan kristalinitas nata de coco sebesar 151,73 %. Data uji k kuatan tank menunjukkan bahwa nata de coco dengan zat warna Cochineal Red A empunyai kekuatan tank yang lebih kecil dibandingkan nata de coca tanpa zat ama. Nata de coco produced from Acetobacter xylinum fermentation in coconut wat r substrate that contains sugar. The most important thing in the development of nat de coca industries is the addition of coloring agent in order to attract con umen's appetite. The aims of this are research are to determine the effect of colo ing agent to nata's tensile strength and crystallinity. The coloring agent Cochineal Red A with variation of concentration were add -d into biopolymerization medium and taken during 8 days. The products of nata de .oco were analysed by FTIR spectroscopy, tensile strength and XRD, resp ctively and then compared with uncolored nata. FTIR spectra of cellulose product from colored nata shown that the hyd ogee bonding increase as the increase of coloring agent concentration. From the > I I spectra known that by adding of coloring agent Cochineal Red A the crys alinity of nata de coca increase by 151,73. Tensile strength data shown that cold ed nata has smaller tensile strength than nata de coco, but increased of coloring age t concentration caused the increase of tensile strength of colored nata.
Item Type: | Thesis (Undergraduate) |
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Subjects: | Q Science > QD Chemistry |
Divisions: | Faculty of Science and Mathematics > Department of Chemistry |
ID Code: | 31089 |
Deposited By: | Mr UPT Perpus 1 |
Deposited On: | 14 Nov 2011 14:43 |
Last Modified: | 14 Nov 2011 14:43 |
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