Garuda - Garba Rujukan Digital

Bead Gel dari Karagenan-Carboxymethylcellulose dengan Crosslinking Glutaraldehid sebagai Controlled Release Urea Sperisa Distantina; Faramitha Rahayu; Tamara Hanum Ghina Zalfa
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Kecepatan Pelepasan Urea dari Controlled Release Fertilizer (CRF): Pengaruh Rasio Carboxymethylcellulose (CMC) – Karagenan Sperisa Distantina; Rara Ayu Lestary; Laili Nurin Jazlina
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Pengaruh Konsentrasi dan Jenis Larutan Perendaman terhadap Kecepatan Ekstraksi dan Sifat Gel Agar-agar dari Rumput Laut Gracilaria verrucosa Sperisa Distantina; Devinta Rachmawati Anggraeni; Lidya Eka Fitri
Jurnal Rekayasa Proses Vol 2, No 1 (2008)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Rumput laut jenis Gracilaria penghasil agar-agar banyak tumbuh di Indonesia, tetapi studi pengolahannya belum banyak. Penelitian ini bertujuan mempelajari proses transfer massa pada ekstraksi agar-agar dari rumput laut Gracilaria verucosa (pantai Pekalongan) secara bacth menggunakan pelarut air. Pengaruh penggunaan alkali NaOH (1,5 N dan 3,75 N) dan asam asetat (0,2 N, 0,6 N, dan 0,8 N) pada tahap perendaman terhadap koefisien transfer massa (kca) dan sifat gel agar-agar (gel strength, melting dan setting temperature) juga dipelajari. Rumput laut direndam menggunakan larutan alkali atau asam selama 15 menit. Setelah dicuci menggunakan air sampai pH netral, rumput laut diekstraksi menggunakan pelarut air. Ekstraksi dijalankan di dalam gelas beker yang dilengkapi motor pengaduk. Cuplikan sampel diambil setiap interval waktu tertentu. Cuplikan dibekukan semalam dalam freezer, kemudian diangin-anginkan sehingga air mencair dan terpisah dari agar-agar. Agar-agar yang dihasilkan dikeringkan mengunakan oven (70C) sampai berat konstan. Hasil penelitian menunjukkan bahwa perendaman dengan alkali menghasilkan kecepatan ekstraksi yang lebih lambat, rendemen lebih rendah tetapi sifat gel agar-agar yang lebih baik dibandingkan perendaman menggunakan larutan asam. Kata kunci: Alkali, Asam Asetat, Perendaman, Ekstraksi, kca Seaweeds of Gracilaria species are abundantly cultivated in Indonesia. However, studies related to its extraction process are still rare. In the present work, the mass transfer process on a batch extraction of agar was studied by extracting seaweeds in hot water solvent. The effect of alkali (NaOH) and acetic acid (CH3COOH) in the soaking process on the volumetric mass transfer coefficient (kca) and the quality of gel agar were investigated. Seaweeds (Gracilaria verrucosa) from Pekalongan coast were soaked in aqueous NaOH (1.5 N and 3.75 N) or in aqueous acetic acid solution (0.2 N, 0.6 N, and 0.8 N). After being washed, the seaweeds were extracted in hot water of 98C and neutral pH. Some of the extract samples at various times were freezed, thawed, dried and weighed. The evaluation of experimental data showed that the mass transfer coefficient kca decreased and the gel strength of agar increased with the increase of alkali concentration. Meanwhile, the value of kca increased and the gel strength of agar decreased with the increase of acetic acid concentration. Key words: Alkali, Acetic Acid, Soaking, Extraction, Volumetric Mass Transfer Coefficient (kca), Gel strength

Kecepatan Pelepasan Parasetamol dari Crosslinked Carrageenan-PVA Film: Pengaruh Rasio Carrageenan-PVA dan Waktu Pengisian (Loading) Sri Sutriyani; Rieke Ulfha Noviyanti; Sperisa Distantina
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Carrageenan which was extracted from seaweed Eucheuma cottonii was mixed with polyvinylalcohol (PVA) andthen carrageenan-PVA was modified with crosslinking method using glutaraldehyde. The result of hydrogelfilms was applied to control the drug release rate of paracetamol. The aim of this research to determine amathematical model that can be used to describe the events of drug release paracetamol, determine the effect ofweight ratio carrageenan-PVA (5:0, 1:0.5, 1:1, 1:2, 0:5) and the loading time of paracetamol (2 and 12 hours)on the parameters of paracetamol release rate from carrageenan-PVA film in a buffer solution pH = 7,4. Theresearch include several steps, the step of making carrageenan-PVA films, crosslinking carrageenan-PVA films,filling the film with paracetamol (Loading) and releasing test of paracetamol in a buffer solution. Themathematical model arranged can describe the mass transfer rate of paracetamol. The weight ratio ofcarrageenan-PVA greatly affect the amount of paracetamol was absorbed in the hydrogel film (Xo) and therelease rate of paracetamol in a buffer solution (kCa). The longer time of loading, paracetamol could beadsorbed more. Paracetamol release rate was faster at loading time 12 hours compared to 2 hours except thePVA film without carrageenan.

Carboxymethylation of Cassava Peel: Effect Sodium Monochloroacetate and Temperature Sperisa Distantina; Inayati Inayati; Fahmi Achmad Saputra; Muhammad Fitra Arifianto
Equilibrium Journal of Chemical Engineering Vol 2, No 1 (2018): Volume 2 No 1 January 2018
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v2i1.40425

Cassava peel contains cellulose that can be chemically modified to be more useful product. In this work, carboxymethylcellulose (CMC) from cassava peel powder was prepared by alkalization using sodium hydroxyde and then followed by carboxymethylation using sodium monochloroacetate. The aims of this work were to investigate the effect of sodium monochloroacetate-powder ratio (0.59, 1.47, 2.95, 4.42) and carboxymethylation temperature (45OC and 70OC) on the degree of substitution (DS) and reaction efficiency (RE). The result of FTIR spectra indicated that carboxylmethyl groups successfully attached on the cellulose backbone to form CMC structure. The higher of sodium monochloroacetate-powder ratio and higher carboxymethylation temperature enhanced its DS but reduced the RE.

Pengaruh Konsentrasi dan Jenis Larutan Perendaman terhadap Kecepatan Ekstraksi dan Sifat Gel Agar-agar dari Rumput Laut Gracilaria verrucosa Sperisa Distantina; Devinta Rachmawati Anggraeni; Lidya Eka Fitri
Jurnal Rekayasa Proses Vol 2, No 1 (2008)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.549

Rumput laut jenis Gracilaria penghasil agar-agar banyak tumbuh di Indonesia, tetapi studi pengolahannya belum banyak. Penelitian ini bertujuan mempelajari proses transfer massa pada ekstraksi agar-agar dari rumput laut Gracilaria verucosa (pantai Pekalongan) secara bacth menggunakan pelarut air. Pengaruh penggunaan alkali NaOH (1,5 N dan 3,75 N) dan asam asetat (0,2 N, 0,6 N, dan 0,8 N) pada tahap perendaman terhadap koefisien transfer massa (kca) dan sifat gel agar-agar (gel strength, melting dan setting temperature) juga dipelajari. Rumput laut direndam menggunakan larutan alkali atau asam selama 15 menit. Setelah dicuci menggunakan air sampai pH netral, rumput laut diekstraksi menggunakan pelarut air. Ekstraksi dijalankan di dalam gelas beker yang dilengkapi motor pengaduk. Cuplikan sampel diambil setiap interval waktu tertentu. Cuplikan dibekukan semalam dalam freezer, kemudian diangin-anginkan sehingga air mencair dan terpisah dari agar-agar. Agar-agar yang dihasilkan dikeringkan mengunakan oven (70C) sampai berat konstan. Hasil penelitian menunjukkan bahwa perendaman dengan alkali menghasilkan kecepatan ekstraksi yang lebih lambat, rendemen lebih rendah tetapi sifat gel agar-agar yang lebih baik dibandingkan perendaman menggunakan larutan asam. Kata kunci: Alkali, Asam Asetat, Perendaman, Ekstraksi, kca Seaweeds of Gracilaria species are abundantly cultivated in Indonesia. However, studies related to its extraction process are still rare. In the present work, the mass transfer process on a batch extraction of agar was studied by extracting seaweeds in hot water solvent. The effect of alkali (NaOH) and acetic acid (CH3COOH) in the soaking process on the volumetric mass transfer coefficient (kca) and the quality of gel agar were investigated. Seaweeds (Gracilaria verrucosa) from Pekalongan coast were soaked in aqueous NaOH (1.5 N and 3.75 N) or in aqueous acetic acid solution (0.2 N, 0.6 N, and 0.8 N). After being washed, the seaweeds were extracted in hot water of 98C and neutral pH. Some of the extract samples at various times were freezed, thawed, dried and weighed. The evaluation of experimental data showed that the mass transfer coefficient kca decreased and the gel strength of agar increased with the increase of alkali concentration. Meanwhile, the value of kca increased and the gel strength of agar decreased with the increase of acetic acid concentration. Key words: Alkali, Acetic Acid, Soaking, Extraction, Volumetric Mass Transfer Coefficient (kca), Gel strength

Title

Found 6 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 6 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 6 Documents
Search