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All Journal Jurnal Rekayasa Proses Reaktor International Journal of Renewable Energy Development Eksergi: Chemical Engineering Journal Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences KOVALEN: Jurnal Riset Kimia Jurnal Fitofarmaka Indonesia Mesin Chemistry Indonesian Journal of Chemical Research CHEESA: Chemical Engineering Research Articles Jurnal Rekayasa Proses JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Teknik Kimia Indonesia International Journal of Renewable Energy Development Jurnal Rekayasa Proses International Journal of Oil Palm Biodiversitas Journal of Biological Diversity Nusantara Bioscience

Johnner P Sitompul

Institut Teknologi Bandung

Author-ID : 337985

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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SIFAT POLIMER DAN KEMAMPUAN TERBIODEGRADASI BLEND BIODEGRADABLE POLYMER POLI (L-ASAM LAKTAT) (PLLA) Johnner P Sitompul; Rizki Insyani; Hyung Woo Lee
Reaktor Volume 15, No.2, OKTOBER 2014
Publisher : Dept. of Chemical Engineering, Diponegoro University

Poly(D,L-lactic acid) (PDLLA) and poly(ethylene glycol) (PEG) was used to modify mechanical and biodegradability properties of poly(L-lactic acid) (PLLA) through solution blending method using solvent mixture of dichloromethane-ethanol. Polymer samples were then characterized using FTIR, DSC, UTM, and enzymatic degradation test. FTIR spectrum of pure PLLA showed specific IR absorption peaks at wavenumber of 3504 cm-1 (-OH), 1757 cm-1 (-C=O), and 1381 cm-1 (-CH3 symmetric). Further, polymer blend samples showed absorption peak shifts at 1755 cm-1 and 1382 cm-1 for PLLA/PDLLA due to stereocomplex interaction and at 3429 cm-1 due to hydrogen bond interaction. DSC results showed that there was melting temperature depression for all polymer blend samples compared to pure PLLA with increasing of either PDLLA or PEG composition. In PLLA/PDLLA, two melting points were discovered because of homocrystallite and stereocomplex phase formation. While PLLA/PEG samples showed increasing crystallinity to 69% at 20%-wt PEG composition. Mechanical analysis showed that 10%-wt of PDLLA addition in PLLA produced better mechanical performance than pure PLLA while 20%-wt of PEG addition showed highest elongation at break with the value of 89%. Polymer blend samples were degradable during enzymatic degradation test represented by percent weight loss with maximum value of 21% for PLLA/PEG sample. Keywords: polymer properties, solution-blending, Poly(lactic acid), polymer blend, enzymatic degradation

STUDI METODE-METODE EKSTRAKSI PEWARNA MAKANAN ALAMI ANNATTO DARI BIJI KESUMBA (Bixa orellana) Johnner Parningotan Sitompul; Martha Situ Situmorang; Tatang Hernas Soerawidjaja
Reaktor Volume 14, Nomor 1, April 2012
Publisher : Dept. of Chemical Engineering, Diponegoro University

Annatto is natural food colorant extracted from Bixa orellana seeds. The main constituent of annatto is bixin, a carotenoid having carboxylic acid groups at both ends of its molecular chain and one of these is methyl-esterified. The carboxylic acid groups of bixin and norbixin cause the molecule to dissolve in aqueous bases. The methyl ester structure causes the molecule dissolving in oil and other organic solvents. The double bond conjugated chain causes bixin dissolved in most organic solvents. These characteristics are mainly bases for extraction solvent selection. The objectives of this research are to evaluate the performance of ethyl acetate and acetone as solvents for annatto extraction with different method of extraction and to obtain a procedure for preparing general purpose annatto extract having the highest possible of bixin yield. Two methods of extraction are carried out using Soxhlet method (at solvent boiling temperature) and ultrasonic bath extraction at room temperature. The selected solvents are ethyl acetate and acetone that have medium polarity index and low boiling point. The bixin quality is examined by measuring pigment content with spectrophotometer at certain wavelength. Two types of seeds from different places in Indonesia will be the investigated as sources of annatto. Experimental results for extraction with Soxhlet method shows that yield of bixin (upon seed) from ultrasonic bath extraction is higher that is 0.584% (w), compared to Soxhlet extraction 0.443% (w). For ultrasonic bath extraction, yield of bixin (upon seed) with ethyl acetate as solvent is 0.602%, much higher compared to that from acetone 0.565%. Extraction with Soxhlet method gives different results. Yield of bixin (upon seed) with acetone as solvent is higher which is 0.460%, compared to ethyl acetate which is 0.427%. Seeds from Bandung (West Java) and Duri (Riau) do not give significant difference of bixin yield from two methods of extraction. Annatto merupakan pewarna alami makanan yang didapatkan melalui ekstraksi dari biji pohon kasumba (Bixa orellana) dengan komponen pewarna utamanya adalah bixin. Keberadaan ikatan rangkap terkonjugasi menyebabkan bixin dan norbixin larut dalam sebagian besar pelarut organik. Ciri struktur kimia dari bixin ini yang menjadi dasar dalam pemilihan pelarut untuk ekstraksi pewarna annatto. Tujuan makalah ini adalah studi metode-metode ekstraksi terhadap perolehan bixin, metode Soxhlet pada temperatur didih pelarut dan metoda ultrasonic bath pada temperatur kamar, dengan dua tempat sumber biji kasumba, Bandung dan Duri. Pelarut yang digunakan adalah etil asetat dan aseton. Pengujian dilakukan dengan mengukur kadar pigmen yang dihasilkan menggunakan spektrofotometri pada panjang gelombang tertentu. Dari penelitian ini, didapatkan data yield (perolehan bixin) dari berbagai variasi percobaan. Perolehan bixin (terhadap biji) yang didapat dari ekstraksi ultrasonic bath lebih tinggi yaitu rata-rata sebesar 0,584%, dibanding dengan metode soxhlet yang rata-rata sebesar 0,443%. Ekstraksi menggunakan metode ekstraksi ultrasonic bath, dan menggunakan pelarut etil asetat lebih tinggi yaitu rata-rata 0,602% daripada menggunakan aseton yang rata-rata 0,565%. Sedangkan dengan metode soxhlet menunjukkan perolehan bixin berbeda, dengan pelarut aseton 0,460%, sedangkan untuk pelarut etil asetat adalah 0,427%. Biji yang berasal dari 2 tempat berbeda, ketika diekstraksi dengan dua metode tersebut tidak memberikan perbedaaan hasil bixin yang signifikan

Co-Authors . Widayat A.N. Istyami A.N. Istyami, A.N. A.R. Ryadin Agus Wanadri Agus Wanadri Ahn, Jung Oh Aini, Apsari Puspita Aldhita Graffi Nabila Ana Kemala Putri Jauhari Ana Kemala Putri Jauhari Angelica, Evelyn Annisa N. Shabrina Arry K. Rizky Asep Bayu Carolus Borromeus Rasrendra Carolus Borromeus Rasrendra Chrismono Himawan Daniel I. Simangunsong Daniel Prasetyo Daniel Prasetyo Daniel Prasetyo, Daniel Daru Setyawan Emanuella, Natasha Enny Nurmalasari Faiq I. Akhiroti Gun Gun Gumilar Gun Gun Gumilar Gusdinar, Tutus H. Rahman H.W. Lee H.W. Lee, H.W. HAMIDAH RAHMAN Hamidah Rahman Hamidah Rahman Hermawan Prajitno Hermawan Prajitno Hermawan Prajitno, Hermawan Hutapea, Try H. A. Hyung W. Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Hyung Woo Lee Indra G. Pasaribu Insyani, Rizky Jung Oh Ahn KUSNANDAR ANGGADIREDJA Kusnandar Anggadiredja Lee, Hyung Woo Lee, Hyung Woo Mario C. Gultom Martha Situ Situmorang Matthew W. Chang Matthew W. Chang Megawati Zunita Michael D.M. Sitompul Permata A. Priyadi Prajitno, Hermawan Prasetyo, Daniel R. Muhtadi R. Muhtadi, R. Rasrendra, Carolus Borromeus Retno G. Dewi Retno G. Dewi Riadi, Indra Rizki Insyani Rizki Insyani Rizki Insyani Rizky Insyani Simangunsong, Daniel I. SURYATI TJOKRODININGRAT Tatang H. Soerawidjaja Tatang H. Soerawidjaja Tatang H. Soerawidjaja Tatang Hernas Soerawidjaja Tika Paramitha Tika Paramitha Tirto Prakoso Try H. A. Hutapea TURSINO TURSINO Tursino, Tursino TUTUS GUSDINAR Tutus Gusdinar Tutus Gusdinar Vita Wonoputri Vita Wonoputri Wanadri, Agus Widayat Widayat Yook Chan Kim Yook Chan Kim Yosandi Calimanto Yosandi Calimanto

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