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All Journal VALENSI Jurnal Teknik Mesin FIKkeS Jurnal Profesi Kependidikan Jurnal Matematika & Sains The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Jurnal Kimia dan Kemasan Indonesian Journal of Biotechnology Jurnal Keramik dan Gelas Indonesia JURNAL NASIONAL TEKNIK ELEKTRO Science and Technology Indonesia Jurnal Sains Teh dan Kina Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Communications in Science and Technology Molekul: Jurnal Ilmiah Kimia Jurnal Keramik dan Gelas Indonesia Jurnal Kimia dan Kemasan Jurnal Manusia dan Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis Borneo Journal of Pharmacy Scientific Contributions Oil and Gas

Didin Mujahidin

Institut Teknologi Bandung

Author-ID : 253969

Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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Encapsulation of Fe3O4 with amina modified silica Robby Roswanda; Didin Mujahidin
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Superparamagnet iron oxide Fe3O4 particles were encapsulated with amina modified silica via Stober Method. The particles generated were rod-like whose length was c.a. 2 µm and the thickness of silica shell was c.a. 75 nm. Magnetization measurements show that the silica shell does not disrupt the superparamagnetic property of Fe3O4. The amine group on the encapsulated particles was confirmed by attaching FITC (Fluorescein isothiocyanate) dye and checked under fluorescence microscope. The encapsulated particle is useful to be modified further for various applications that need magnetic field control.

Studi Penggunaan Metil Ester Minyak Sawit Sebagai Minyak Isolasi Peralatan Listrik Abdul Rajab; Andi Pawawoi; Aminudin Sulaeman; Didin Mujahidin
JURNAL NASIONAL TEKNIK ELEKTRO Vol 3 No 1: Maret 2014
Publisher : Jurusan Teknik Elektro Universitas Andalas

This paper discusses experimental results on some parameters of palm methyl ester as insulating oil. Destillations are firstly made to obtained the composition of oil that provide the optimal compromise among measured parameters. Breakdown voltage, dissipation factor, dielectric constant, viscosity and oxidation stability were then tested on original, destilled, and destillation residual oils. The results showed that the dissipation factor and viscosity of destilled palm methyl ester comply with the standard spesification for natural ester to be used as insulating oil. Sadly, the breakdown voltage and oxidation stability of oils do not fulfill the standard. However, the lower breakdown voltage of oils seem to be tolerable as their value are still higher then that of mineral oil. Dielectric constant of oils which were higher then that of mineral oil is an advantage when the oils will be used in combination with solid insulation for more uniformly field reason. Key words : Methyl ester, breakdown voltage, dissipation factor, dielectric constant, viscosity, oxidation stability. AbstrakMakalah ini membahas beberapa parameter metil ester minyak sawit sebagai minyak isolasi. Destilasi dilakukan untuk mendapatkan komposisi minyak yang paling mungkin digunakan sebagai kandidat minyak isolasi. Minyak asli, hasil destilasi dan residu dari destilasi kemudian diuji beberapa parameternya seperti tegangan tembus, faktor disipasi, konstanta dielektrik, viskositas dan stabilitas oksidasi. Hasilnya menunjukkan bahwa faktor disipasi dan viskositas metil ester minyak sawit memenuhi standar sebagai minyak isolasi. Sayangnya tegangan tembus dan stabilitas oksidasinya termasuk kurang memadai. Namun demikian, tegangan tembusnya mungkin bisa ditolerir karena nilanya lebih baik dibanding minyak mineral. Konstanta dielektrik minyak yang lebih tinggi dibanding minyak mineral termasuk menguntungkan untuk keseragaman medan yang lebih baik saat penggunaan bersama dengan isolasi padat.Kata Kunci : Metil ester, tegangan tembus, faktor disipasi, konstanta dielektrik, viskositas, stabilitas oksidasi

Unexpected Dimer from Demethylization Reaction of Eugenol under Acidic Conditions Anita Alni; Meilisa Dara Puspita; Didin Mujahidin
Journal of Mathematical and Fundamental Sciences Vol. 51 No. 1 (2019)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2019.51.1.5

Eugenol is an alkenyl phenol compound obtained as an essential oil from different parts of the clove such as its leaves and flowers. The essential oil from cloves can contain up to 90% eugenol, which is mainly responsible for its aroma. Eugenol is an interesting compound due to its simplicity and richness in functionalities, making it a valuable building block in synthesis. One of the key steps in eugenol transformation is demethylation to produce a hydroxycavicol. Demethylation is commonly carried out using a nucleophilic or an acidic method. In this study, a simple yet reliable nucleophilic method for demethylation using lithium chloride (LiCl) was attempted. The product was characterized by NMR, FTIR and HRMS spectroscopy. The absence of a methoxy signal at 3.5-4 ppm in the 1H NMR spectrum suggests that demethylation was successful. The HRMS result showed m/z 149.0596, confirming the formation of product. The demethylation reaction under acidic conditions formed a dimer of eugenol with the methoxy group still intact. This was supported by the 1H NMR data, which showed methoxy signals at 3.85 and 3.82 ppm and integration in the aromatic region, which suggests a dimer structure.

Artelastokromen Suatu Diprenilpiranoflavon dan B-Resorsilaldehid dari Kayu Batang Artocarpus Lanceifolius Didin Mujahidin; Sjamsul Arifin Achmad; Yana Maolana Syah; Euis Holisotan Hakim; Lukman Makmur; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama; Rusjdi Tamin
Journal of Mathematical and Fundamental Sciences Vol. 32 No. 2 (2000)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstrak. Dua senyawa, yaitu artelactokromen (1), suatu diprenil piranoflavon, dan B-resorsilaldehid (2) telah ditemukan untuk pertama kalinya pada kayu batang tumbuhan Artocarpus lanceifolius Roxb. (Moraceae), suatu tumbuhan langka yang endemic untuk Indonesia dan dikenal dengan nama Keledang. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi (MS, 1H dan 13C NMR). Baik artelastokromen (1) maupun B-resorsilaldehid (2) tidak terlalu toksik terhadap nauplii udang Artemia salina Leach., masing-masing dengan LC50 298,2 dan 79,7 ug/mL. Artelastochromene a Diprenylphyranoflavone and Î’-Resorcylaldehyde from the Wood Trunk of Artocarpus LanceifoliusAbstract. Two phenolic constituent, namely artelastochromene (1), a diprenyl pyranoflavone, and Î²-resorcylaldehyde (2) had been isolated from the wood trunk of Artocarpus lanceifolius Roxb. (Moraceae), an endemic species of Indonesia, locally known as Keledang. The structures of both compounds were elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR). Both artelastochromene (1) and Î²-resorcylaldehyde (2) showed very slight toxic effect against shrimp nauplii Artemia salina Leach., LC50 298,2 and 79,7 Î¼g/mL, respectively.

Suatu Senyawa Stilbene Terprenilasi dari Kayu Akar Tumbuhan Artocarpus Altilis Euis Holisotan Hakim; Valentina Adimurti; Lukman Makmur; Sjamsul Arifin Achmad; Didin Mujahidin; Yana Maolana Syah; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 3 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Suatu stilben terprenilasi, trans-4-(3-metil-E-but-l-enil)-3,5,2',4'-tetrahidroksistilben telah ditemukan untuk pertama kalinya dari ekstrak kloroform kayu akar tumbuhan Artocarpus altilis (Moraceae), yang dikenal dengan nama Sukun. Struktur molekul senyawa ini telah ditetapkan berdasarkan data fisika dan spektroskopi UV, IR, MS, 1H dan 13C NMR. Senyawa ini bersifat toksik (LC50 = 45,7 µg/mL) terhadap benur udang Artemia salina Leach. A prenylated stilbene from the root trunk of Artocarpus altilisA prenylated stilbene, trans-4-(3-methyl-E-but-l-enyl)-3,5,2',4'-tetrahydroxystilbene had been isolated for the first time from the chloroform extract of the root trunk of Artocarpus altilis (Moraceae), locally known as Sukun. The structure of this compound was Elucidated based on physical and spectroscopic data UV, IR, MS, 1H and 13C NMR. It showed strong toxicity (LC50 = 45,7 µg/mL) agains Atrtemia salina Leach shrimp.*Bagian ke-25 dari seri "llmu Kimia Tumbuhan Moraceae lndonesia". Untuk Bagian ke-24 lihat pustaka (5)

Artoindonesianin D: a New Bioactive Pyranoflavone Derivative and Chaplashin from Artocarpus Maingayi Euis Holisotan Hakim; Affrida Affrida; Eliza Eliza; Sjamsul Arifin Achmad; Lukman Makmur; Didin Mujahidin; Yana Maolana Syah; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama
Journal of Mathematical and Fundamental Sciences Vol. 32 No. 1 (2000)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Sari. Suatu senyawa baru flavonoid terisoprenilasi turunan piranoflavon, yakni 5-hidroksisiklomorusin yang diberi nama artoindonesianin D (1), dan suatu senyawa turunan oksepinoflavon, yakni chaplasin (2), telah ditemukan untuk pertama kalinya, masing-masing pada kulit akar dan kayu akar tumbuhan Artocarpus maingayi King (Moraceae). Tumbuhan langka ini berasal dari Sumatera Barat dan endemik untuk Indonesia, serta dikernal dengan nama daerah Cubadak Utan. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi (MS, 1H dan 13C NMR). Artoindonesianin D (1) dan chaplasin (2) bersifat toksik terhadap nauplii udang Artemia salina Leach. Artoindonesianin D: a New Bioactive Pyranoflavone Derivative and Chaplashin from Artocarpus MaingayiAbstract. A new isoprenylated flavonoid, a pyranoflavone derivative 5'-hydroxycyclomorusin named artoindonesianin D (1), and an oxepinoflavone derivative chaplashin (2) were isolated for the first time, respectively from the root bark and root trunk of Artocarpus maingayi King. (Moraceae). This plant is locally known as Cubadak Utan, a rare species found in West Sumatera and endemic to Indonesia. The structure of both compounds were elucidated based on physical and spectroscopical data (MS, 1H and 13C NMR). Artoindonesianin D (1) and chaplashin (2) showed toxic effect against shrimp nauplii Artemia salina Leach.

Artonol B and Sikloartobilosanton dari Artocarpus teysmanii MIQ Lukman Makmur; Syamsurizal Syamsurizal; Tukiran Tukiran; Yoharmus Syamsu; Sjamsul Arifin Achmad; Euis Holisotan Hakim; Didin Mujahidin; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 2 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Dua senyawa masing-masing turunan santon lakton, yaitu artonol B (1) dan turunan furanodihidrobenzosanton, yakni Sikloartobilosanton (2), telah ditemukan pada tumbuhan Artocarpus teysmanii Miq. (Moraceae), suatu tumbuhan langka yang endemik untuk Indonesia dan dikenal dengan nama Tipulu. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi (MS, 1H dan 13C NMR). Artonol B (1) dan sikloartobilosanton (2) memperlihatkan toksisitas yang tinggi terhadap udang Artemia salina, dan senyawa 2 juga memperlihatkan aktivitas antimitotik yang rendah terhadap target cdc2 kinase dan cdc25 fosfatase. Artonol B and Cycloartobiloxanthone from Artocarpus teysmanii MIQTwo compounds, a xanthone lactone derivative, namely artonol B (1) and a furanodihydrobenzoxanthone derivative, namely cycloartobiloxanthone (2) had been isolated from Artocarpus teysmanii Miq. (Moraceae), locally known as Tipulu. The structures of both compounds were elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR). Both artonol B (1) and cycloartobiloxanthone (2) showed strong toxicity against Artemia salina in the shrimp bioassay, and compound 2 also showed weak antimitotic activity against cdc2 kinase and cdc25 phosphatase as the targets. Bagian ke-8 dari seri Ilmu Kimia Tumbuhan Moraceae Indonesia, untuk bagian ke-6 lihat pustaka [10].

Senyawa Turunan Piranoflavon dan Furanodihidrobenzoxanton dari Artocarpus Ianceifolius Euis Holisotan Hakim; Asnizar Asnizar; Fera Kurniadewi; Tedi Abdul Ghofar; Sjamsul Arifin Achmad; Lukman Makmur; Didin Mujahidin; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama; Rusjdi Tamin
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 2 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Sari. Dua senyawa turunan piranoflavon dan furanodihidrobenzosanton, masing-masing artelastin (1) dan sikloartobiloksanton (2), telah ditemukan masing-masing pada kayu dan kulit batang tumbuhan Artocarpus lanceifolius Roxb. (Moraceae), suatu tumbuhan langka yang endemik untuk Indonesia dan dikenal dengan nama Keledang. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi (MS, 1H dan 13C NMR). Artelastin (1) sangat menghambat transportasi asam amino leusin melalui membran usus ulat sutera Bontbyx mori, sedangkan sikloartobilosanton (2) menunjukkan toksisitas yang tinggi terhadap udang Artemia salina. Pyranoflavone and Furanodihydrobenzoxanthone Derivatives from Artocarpus IanceifoliusAbstract. Two pyranoflavone and furanodihydrobenzoxanthone derivatives, namely artelastin (1) and cycloartobiloxanthone (2), had been isolated respectivelfy from the wood and the tree bark of Artocarpus lanceifolius Roxb. (Moraceae), an endemic species of lndonesia, locally known as Keledang. The structures of both compounds were elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR). Artelastin (1) strongly inhibited leucin amino acid transport in Bombyx mori midgut, while cycloartobiloxanthone (2) showed high toxicity against Artemia salina shrimp. Bagian ke-6 dari seri Ilmu Kimia Tumbuhan Moraceae Indonesia, untuk bagian ke-5 lihat Pustaka (8)

Artocarpin ad Heteroflavanone-A, Two Bioactive Flavonoids from Artocarpus champeden Euis Holisotan Hakim; Emilia Evi Marlina; Didin Mujahidin; Sjamsul Arifin Achmad; Lukman Makmur; Emilio L. Ghisalberti
Journal of Mathematical and Fundamental Sciences Vol. 30 No. 1 (1998)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Suatu senyawa flavon terisoprenilasi, yaitu 3-(y,y-dimetilalil)-6-(3-metil-1-butenil)-7-metoksi-5,2, 4-trihidroksiflavon atau artokarpin (1), bersama-sama dengan suatu senyawa flavanone langka, yakni 5-hidroksi-7,2,4,6-tetrametoksiflavanon atau heteroflavanon-A (2); telah ditemukan masing-masing pada kayu dan kulit batang tumbuhan Artocarpus champeden Spreng (Moraceae), suatu tumbuhan pangan yang endemik untuk Indonesia dan dikenal dengan nama cempedak. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi. Kedua senyawa flavonoid ini menghambat transportasi asam amino leusin melalui membran usus ulat sutera Bombyx mori, sedangkan artokarpin (1) juga menunjukkan toksisitas yang tinggi terhadap udang Artemia salina. Artocarpin ad Heteroflavanone-A, Two Bioactive Flavonoids from Artocarpus champedenAn isoprenylated flavone, 3-(Î³,Î³-dimethylallyl)-6-(3-methyl-1-butenyl)-7-methoxy-5,2',4'-trihydroxyflavone or artocarpin (1), together with rare flavanone derivative, 5-hydroxy-7,2',4',6'-tetramethoxyflavanone or heteroflavanone-A (2) were isolated from the wood and the tree bark of Arocarpus champeden Spreng (Moraceae), an endemic plant of Indonesia, locally known as cempedak. The structures of both compounds were elucidated based on physical and spectroscopic data. Both flavonoids inhibited the amino acid transport in Bombyx mori midgut, while artocarpin (1) also showed high toxicity against Artemia solina shrimp.

Artoindonesianin-E suatu senyawa baru turunan flavanon dari tumbuhan Artocarpus Champeden Euis Holisotan Hakim; Asep Aripin; Sjamsul Arifin Achmad; Norio Aimi; Mariko Kitajima; Lukman Makmur; Didin Mujahidin; Yana Maolana Syah; Hiromitsu Takayama
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 3 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Sari. Suatu senyawabaru turunan flavanon, yakni 5,7-dihidroksi-2',4',6'-trimetoksiflavanon yang diberi nama artoindonesianin-E(1 ), telah ditemukan untuk pertama kalinya bersama-samad engan artokarpin (2) dan heteroflavanon-A (3) pada ekstrak benzena kulit batang tumbuhan Artocarpus champeden Spreng (Moraceae), suatu tumbuhan yang endemik untuk Indonesia, serta dikenal dengan narna Cempedak. Struktur molekul senyawa tersebut telah ditetapkan berdasarkan data fisika dan spekroskopi (MS, 1H dan 13C NMR).Artoindonesianin-E a New Flavanone Derivative from Artocarpus ChampedenAbstract. A new flavanone derivative, 5,7-dihydroxy-2',4',6'-trimethoxyflavanone named artoindonesianin-E (1) had been isolated for the first time, together with artocarpin (2) and heteroflavanone-A (3) from benzene extract of the tree bark of Artocarpus champeden Spreng. (Moraceae), a species endemic to Indonesia and locally known as Cempedak. The structure of this compound was elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR).

Co-Authors Abdul Rajab Achmad Romadin Ade Danova Affrida Affrida Agustono Wibowo Ahmad Fauzi Ahwan Ahwan Aisyah Aisyah Aisyah Aisyah Alfhons Daniel Sirampun Aminudin Sulaeman Andi Pawawoi Andi Suhendi Anita Alni Anita Alni Anita Alni, Anita Ari D. Pasek Aryadi Suwono Asep Aripin Asnizar Asnizar Buchari Buchari Chavasiri, Warinthorn Dadan Damayandri Danova, Ade Eliza Eliza Emilia Evi Marlina Emilio L. Ghisalberti Euis Holisotan Hakim Euis Holisotan Hakim Euis Holisotan Hakim Fareza, Muhamad Salman Fera Kurniadewi Hans Martin Rudolf Hoffman Hans Martin Rudolf Hoffman, Hans Martin Rudolf Hermawati, Elvira Hiromitsu Takayama Hiromitsu Takayama Ilham ardatul putra Indra Noviandri Iqbal Musthapa Irfansyah Rizal Joko Santoso Kurniadewi, Fera Lia Dewi Juliawati Lukman Makmur Lukman Makmur Lukman Makmur Lukman Makmur Lukman Makmur Lukman Makmur Mariko Kitajima Mariko Kitajima Meilisa Dara Puspita Muhtadi Muhtadi Nila Berghuis Tamaela Nila Berghuis Tamaela, Nila Berghuis Nindita Fransiska Rahmawati Norio Aimi Norio Aimi Nuryanti Nuryanti Pirim Setiarso Pirim Setiarso Rehana Rehana Reny Rosalina Reny Rosalina Rino Rakhmata Mukti Robby Roswanda Rusjdi Tamin Rusjdi Tamin Sa'adah, Pipih Lutfi Shinta Ellisya Fauzia Siti Nurbayti Siti Zubaidah Sjamsul Arifin Achmad Sjamsul Arifin Achmad Sjamsul Arifin Achmad Sjamsul Arifin Achmad Sjamsul Arifin Achmad Sjamsul Arifin Achmad Soerya Dewi Marliyana Soerya Dewi Marliyana Sulaeman, Aminudin Syamsurizal Syamsurizal Tedi Abdul Ghofar Teguh Hafiz Ambarwibawa Tukiran Tukiran Valentina Adimurti Yana M Syah Yana Maolana Syah Yani F. Alli YAYA RUKAYADI Yohanes B.D. Wangge Yoharmus Syamsu Yudha Taufantri Yuli S. Indartono

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