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Pelepasan Doxorubicin (DOX) Dari Hidroksiapatit (HA) Dengan Variasi Nilai pH Dan Rasio Dox-Ha / Phosphat Buffer Saline (PBS) Nursyaniati Nursyaniati; Ahmad Fadli; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Hydroxyapatite was a material that could be used as drug delivery in cancer by doxorubicin adsorbed on to hydroxyapatities surface. The purpose of this research were to study the effect of variation of pH and ratio DOX-HA : PBS on speed release. HA was suspended in 10 ml of DOX (100 ppm) strirred using a magnetic stirrer with speed 250 rpm at temperature 37ºC for 24 hours. After that it filtered at vacuum pressure for 24 hours. The release of DOX from 270 mg HA powder were soaked in 350 ml of solution PBS (pH 5,6 dan 7,4). The samples were taken every two hours until 120 hours. The concentration of DOX’s released were analyzed by UV-Vis. Furthermore, the DOX-HA powder were characterized with FTIR. There was HA and DOX function group which meant, there were any DOX’s adsorbed and released from HA used powder. If higher pH and more HA powder were used, would effect the released of DOX were more effective. The released in the first 40 hours of DOX concentration released in PBS was maintained at 1,25 and 6,92 ppm for each pH 7,4 and 5,6. While for mass HA variations maintained at 0,625; 3,541; 4,508; and 4,958 ppm for each 0,2; 0,3; 0,4 dan 0,5 gram.Keywords : doxorubicin, drug delivery, hydroxyapatite, phosphat buffered saline, release.
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Terumbu Karang Menggunakan Metode Hidrotermal Dengan Variasi Temperatur Reaksi Yunus Olivia Novanto; Yelmida Azis; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Coral reefs that have been damaged so far are not utilized and only pollute the coast. Even though coral reefs are composed of calcium carbonate compounds which can be used for the synthesis of hydroxyapatite, an important mineral found in human bones. The purpose of this study was to synthesize HAp from precipitated calcium carbonate (PCC) coral reef using the hydrothermal method, determine the effect of temperature on the characteristics of HAp and determine the best temperature for making HAp using the hydrothermal method. Coral PCC and (NH4)2HPO4 were reacted with an initial Ca/P ratio of 1,77 and the reaction temperature varied from 110oC, 120oC, 130oC, 140oC, 150oC, 160oC and 170oC for 14 hours. Then the crude HAp was washed using distilled water to pH 7 and dried at 110oC. The synthesized hydroxyapatite was then analyzed using X-ray Diffraction (XRD) and Scanning Electron Microscopy-Electron Dispersive X-ray (SEM-EDX). The results of the XRD analysis showed that the diffractogram peak of the synthesized HAp was similar to the standard with the best crystallinity of 82,28% at 140oC, while the smallest crystal size was 19,5 nm at 170oC. For the results of SEM-EDX analysis, the synthesized HAp has a uniform particle size with the final ratio of Ca/P at 140oC is 1,76 and at 170oC is 1,96. Based on those analysis, the hydroxyapatite synthesized from PCC coral using the hydrothermal method has the best characteristics at the reaction temperature of 140oC and has met the ISO 13779-2-2008 standard as a bone impant.Keywords: coral, hydroxyapatite, hydrothermal, PCC, temperature.
Optimasi Pembuatan Tricalcium Phospate (TCP) Berpori Dengan Metode Protein Foaming-Starch Consolidation Menggunakan Analisa Response Surface Methodology (RSM) Adi Maulana Putra; Ahmad Fadli; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Porous Tricalcium phosphate is a material that can be used as bone substitute. Protein foaming-starch consolidation method is a technique to produce Porous Tricalcium Phosphate (TCP) using yolk as an agent to form pore. This research aims to know the influence of slurry composition and temperature rising rate of sintering on physical, chemical and mechanical properties of porous TCP and to conduct characterization porous TCP in accordance with standard as synthetic bone graft. This research was begun with mixing the TCP powder, starch, Darvan 821A and yolk. Slurry was stirred mechanically in speed of 150 rpm for 3 hours. Slurry was poured in mold and heated in oven with the temperature of 180°C for an hour. Then sample was released from mold and burnt at 600°C ended by sintering at 1100°C for an hour. The result was porous TCP with porousity of 73,7-79,30%, density of 0,65-0,83 g/cm3 and compressive strength of 1,88-2,4 Mpa. Significance level between variables can be seen from pvalue < 0,05 and lack of fit > 0,05 which show that model was corresponding toward the result. R2 obtained were Y1 = 89,68%, Y2 = 89,69%, Y3 = 89,06%. The most affecting factor significantly towards all the responses was dispersant addition that followed by starch addition and temperature rising rate of sintering. In optimum condition (dispersant addition of 8,09 gr with starch addition of 9 gr and temperature rising rate of sintering of 1°C/minute) was obtained the optimum value of response for porosity by 75,7378%, density by 0,76gr/cm3 and compressive strength 2,16 Mpa.Keywords : tricalcium phophate, yolk, porosity, density, compressive strength
Kinetika Reaksi Deasetalisasi Sintesa Kitosan Dengan Pendekatan Shrinking Core Model (SCM) Annisa Rahmat; Ahmad Fadli; Amun Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Chitosan is poly (2-amino-2-deoxy-β- (1-4) -D-glucopyranose) with molecular (C8H11NO4)n which produced from chitin of ebi waste through deacetylation process. Chitosan can be synthesized from ebi waste using chemical methods through deproteinasi, demineralization and deacetylation. Research procedure was begining with the size reduction of ebi waste into powder size. Then the powder was treated with NaOH 3.5% (deproteinasi), the ratio of deproteinasi 1:10 (w / v) for 2 hours and the stirring speed of 150 rpm. Deproteinasi product was treated with HCl 1 N (demineralization), the ratio of demineralization 1:15 (w / v) for 1 h and the stirring speed of 150 rpm. Demineralised product was reacted using 50% NaOH (deacetylation), the ratio of deacetylation 1:25 (w / v) at a speed of 100.150 stirring, and 200 rpm with a temperature of 120 ° C for 2 hours. Samples were taken every 10 minutes rise as much as 10 mL, washed until pH neutral and dried. Deacetylation degree of chitosan analyzed using acid-base titration method. By the range between in the stirring speed of 100-200 rpm it proved that the faster some mixing the bigger it is of deacetylation of chitosan is between 74,54%-83,14%. Reaction kinetics model suitable to describe the events that occur in the synthesis of chitosan was a model that was a layer 2 results (chitosan) to control.Keywords: deacetylation, reaction kinetics, chitosan, waste ebi, shrinking core model.
Ball Milling Process Of Hydroxyapatite From Sea Shells By Synthesis Method With Low Temperature Hydrothermal Rahmad Rasyidin; Ahmad Fadli; Silvia Reni Renti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Ball milling of hydroxyapatite from sea shells has been successfully done by the low temperature hydrothermal method. The purpose of research is to determine the effect of time and number of ball mill in ball mill process to character of hydroxyapatite properties. Firstly,sea shells were calcined at 1000°C for 24 hours for producing CaO. And then 55.63 grams of (NH4)2HPO4was dissolved in 600 mL of distilled water and then 45.91 grams of CaO added into the solution until formed a slurry. Subsequently, the slurry was dried in an oven at 120°C for 15 hours. The drued slurry was then milled trough a ball milling process with variations of time of 1, 2, and 4 hours and variations in number of 10, 20, and 30 grinding balls then calcined temperature 900°C holding time of 2 hours. The results showed that the smallest diameter of the crystal at the ball mill process for 2 hours using 20 grinding balls is 67 nm. While the surface area obtained will increase if the resulting smaller size of the crystal.Keywords: Ball mill, Hydroxyapatite, Hydrothermal, Sea Shells and Crystal Diameter
Pengaruh Molaritas Dan Jumlah Pencelupan Pada Sintesis Copper-Cobalt Oksida Berbasis Nitrat Di Atas Substrat Aluminium Sebagai Solar Selective Absorber Dengan Metode Sol-Gel Dip Coating Muhammad Iqbal; Amun Amri; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Key component that determining the efficiency of a solar thermal collector is a thin layer on the surface of the collector that absorbs solar radiation selectively and convert it into heat energy or commonly called solar selective absorber (SSA). Solar selective absorber can be synthesized using sol-gel dip coating method. The purpose of this research is to know the effect variation molar of copper nitrate-cobalt nitrate and number of dipping-drying cycles to absorptance copper-cobalt coating. Pieces of aluminum with size 2x4 cm were cleaned using a solution of phosphoric acid 10% wt at temperature ±50oC for 10 minutes. Sol precursor prepared by mixing copper nitrate and cobalt nitrate in ethanol and the addition of propionic acid as a catalyst and complexing agent. The mixture was stirred for 2 hours at room temperature. The coating were synthesized by varying molar percursors (ratio 1:1) 0.1M, 0.25M, 0.4M and number of dipping-drying cycles 1x, 2x, 3x, 4x, 6x, 8x and 10x, then annealed at temperature 550 oC for 1 hour. Reflektance spectra in the area of UV-Vis-NIR show that increased cycles of dipping-drying cycles (which increases the thickness of the coating) increase the value of absorptance (α), as well as the increase in the concentration of sol precursors. The results showed that the highest absorptance value found in coatings which was synthesized using mixture copper nitrate and cobalt nitrate molar variations 0.1 M at 10x cycles (dyeing and drying) with absorptance (α) = 88.69%. Further characterization showed emitance values (ε) = 12.9%. Morphological analysis showed that the surface structure of the coating was composed of nanometer-sized particles that form the porous structure. XRD analysis showed there was no change of formed crystal structure of copper oxide and cobalt oxide by increasing temperature. Adhesion test showed the adhesi between the coating and the substrate can be categorized as very strong (5B scale ASTM D 3359)Keywords : aluminum, coating, solar selective absorber and sol-gel dip coating
Kinetika Reaksi Sintesis Magnetite Menggunakan Metode Kopresipitasi Dengan Pendekatan Model Avrami Adela Shofia Addabsi; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Magnetite is a material that can be used in a drug delivery aplication. The purpose of this study is to determine the effect of temperature and stirring rate on the magnetite crystal size and determine the kinetic equation of magnetite synthesis with Avrami model approach. The magnetite was synthesized using coprecipitation method by reacting FeCl3 and FeCl2 in 2:1 mole ratio and NH4OH 10% at temperature range of 40°C, 60°C, 80°C, and a stirring rate were 300, 400, 500 rpm in a beaker. Samples were taken about 20 mL in every 5 minutes for 30 minutes. Then the sample was filtered to separate solids and filtrate. Analysis of Fe concentrations in the filtrate was using AAS, while the precipitate was washed until neutral and dried at 100°C for 2 hours. Then the magnetite powder was characterized by XRD and SEM-EDX. From the characterization we found a cubic structure of magnetite and crystals size of magnetite is about 10-12 nm formed. The morphology of the magnetite particles tended to be aglomerated but if the temperature and stirring rate increased, the aglomeration of the particles would be uniform. This synthesis of the magnetite could be approximated by the Avrami model with the core of forming function value (n) is ranging from 1.3-1.6. If the temperature and the stirring rate increased, the value of the rate constant of transformation (k) increased too. At temperature 30 °C; 300 rpm obtained the constant rate of transformation of 0.01 min-1 and 0.08 min-1 at temperature 80 °C; 500 rpm.Keywords: aglomeration, avrami, coprecipitation, drug delivery, magnetite
Adsorpsi Zat Warna Rhodamine-B Menggunakan Fly Ash Sawit Yang Dimodifikasi Dengan NaOH Sebagai Adsorben Charismayani Charismayani; Edy Saputra; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Rhodamine B contributes significantly to environmental pollution, because it is nonbiodegradable, toxic and harmful to the environment. One effort to reduce the amount of Rhodamine B is the adsorption process. The purpose of this study to determine the effect of adsorption temperature, pH, adsorbent mass. Knowing the optimum conditions for reducing the levels of dye in the water, as well as determine the adsorption equilibrium modelsRhodamine B using fly ash oil modified with 1.4 NaOH as an adsorbent. fly ash modification processes are done by mixing fly ash and NaOH in the ratio 1: 4. The adsorption process isconducted by mixing fly ash oil and pH solution of rhodamine B. The optimum conditions for reducing the levels of rhodamine B in water is the adsorbent mass of 5 g/L, temperature of45°C and pH 2. Thermodynamic data such as ΔH, ΔG and ΔS were calculated. And the mechanism of rhodamine B dye adsorption by fly ash oil is dominated by Freundlich isotherm models representing physical adsorption.Keyword: Adsorption, Rhodamine B, Fly Ash, Isothermal Adsorption
Sintesis Komposit Magnetit/Hidroksiapatit Menggunakan Metode Hidrotermal Dengan Variasi Waktu Dan Konsentrasi FeCl3 Bima Wandika Putra; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Magnetite / hydroxyapatite composite is a material that can be used as a drug carrier. The purpose of this study was analyzing variations in time and FeCl3 concentration on the characteristics of composites produced using the hydrothermal method. A total of 0.3248 gr FeCl3.6H2O (2 mmol or 0.05 M), sodium citrate 1.1764 gr (4 mmol or 0.10 M), and 0.3604 gr urea (6 mmol or 0.15 M) dissolved in 40 ml of distilled water, then 0.1 g of PEG (7.5 g/L) is added while stirring until it runs out, then added Hydroxyapatite powder as much as 30% by weight, stirring until it dissolves. After being put in a Teflon container. The container was put into an oven and set at 210 ° C. The reaction times used in this study were 5, 7, 9, 12 and 15 hours. Furthermore, it was carried out with the help of an external magnetic field (permanent magnet) so that the process can be carried out quickly and more effectively. Furthermore, it was settled by completion. The sample is then dried at oven temperature 120°C for 12 hours. The resulting composite powder was characterized by XRD, BET, TEM, and VSM. Increasing hydrothermal time to 15 hours at a concentration of 0.15 M, increasing the surface area of particles from 64.48 m2/gr to 67.41 m2 /gr. Where as the variation of higher FeCl3 concentration from 0.05 M to 0.15 M is the large size of magnetite crystals 18.41 nm to 22.77 nm. Variation of higher FeCl3 concentration enlarged the surface area of particles from 48.21 m2/gr to 67.41 m2/gr, increased magnetic saturation value from 13.24 emu / gr to 17.27 emu/gr, with the shape of the particles produced round shape measuring 15 nm.Keywords: composite, drug delivery, hydrothermal, hydroxyapatite, magnetite
Efforts to Maximize the Performance of SMEs and Partnerships Through Experience and Business Capital Junaidi Junaidi; Zulkarnain Lubis; Ihsan Effendi; Nasib Nasib; Ahmad Fadli
Budapest International Research and Critics Institute-Journal (BIRCI-Journal) Vol 5, No 2 (2022): Budapest International Research and Critics Institute May
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birci.v5i2.4641

Abstract

The main objective of this study is to determine the direct and indirect effect of the variables of business experience and venture capital on the partnership and performance of SMEs. This type of research includes causal research. As for the population in the study, namely the SMEs fostered at PTPN III Nusantara, which amounted to 98 SME business actors. Where these 98 SMEs are all engaged in trading businesses. The sampling technique used was a saturated canoe. So that the sample in this study is 98 SME business actors. The data was collected using a questionnaire that was compiled based on each variable indicator item. The data analysis technique used Structural Equation Modeling with Smart PLS. The results of the study indicate that business capital directly has a significant direct effect on the partnership, while business experience is not significant. Furthermore, direct business experience, venture capital, and partnerships have a significant direct influence on the performance of SMEs. Lastly, only business capital indirectly has a significant influence on the performance of SMEs through partnerships, while business experience does not have an indirect effect.
Co-Authors Abdul Kohar Abdul Malik K.A Abdul Rasyid Achmad Noerkhaerin Putra Adam Samsudin Noor Ade Pratama Adela Shofia Addabsi Adha Widoni Adi Maulana Putra Adi Mulyadi Putra Adrianto Ahmad Aep Saefullah Afrila Afrila Agung Prabowo Agung Prabowo Agus Susanto Agya Mutia Alifta Ahmad Aguswin Ahmad Fadhil Nugroho Ahmad Riadi S Hasibuan Ahmad Zaki Akhmad Akhmad Akhmad Akromusyuhada Alfarisi, Cory Dian Allailus Syah Safara Aman aman Amun Amri Andi Risfan Rizaldi Annisa Aprilya Putri Annisa Rahmat Ap’aluddin Ari Aditia Sukma Sukma Arifin Setiabudi Arisky Rahmatulloh Arosyidin Arosyidin Aulia Permatasari Bahruddin Benny Ahmadi Bima Wandika Putra Cahyo Dwi Rachmadi Calvin Prasetyo Chaniago, Sabaruddin Charismayani Charismayani Chorina Ika Ristanti Damayanti, Elok Debora Tambunan Deni Astika Derry Hanriansyah Pratama Deska Deska Devia Febrina Dewi Indah Pratiwi Dewi Rafiah Pakpahan Dhamala Shobita Chandra Dhanang Hayuningwang Dingot Hamonangan Sitanggang Dion Julio Iskandar Dovy Reyandi Drastinawati Drastinawati Dwi Yerlis Rahmi Edy Saputra Effendi, Ihsan Elvira Sitna Hajar Emizatul Aini Ervina Ervina Esty Octiana Sari Fadhil Mubarak Fajril Akbar Fernando Susilo Fisy Amalia Gading Bagus Mahardika Gede Indra Ludy Wirata Gunawan Atmaja Halim Wijaya Heni Sugesti Herry Novriansyah I Wayan Sudiarta Idral Amri Ika Agustina Ika Karina Ika Puspa Satriany Ilham Habib Indah Fitriani Indra Yasri Indrawan Indrawan Ines Indriyani Irdoni HS Irdoni Irdoni Irwan Ahussalim Jabosar Ronggur Hamonangan Panjaitan Jannatin Ardhuha Jayaun Jayaun Jenial S Jenni Kristina Br Panjaitan Jessica Andre Julharmito Julharmito Junaidi Junaidi Kania Farida Komalasari Komalasari LALU RUDYAT TELLY SAVALAS Lathifah Cahyani P3 Lia Yuningsih Lilis Suriani Luci Octaria M Satria Haruda M. Ferdinansyah M. Zamroni Mahendra Aswit Sandra Barata Manda Dwipayani Bhastary Marlinda Martin Maya Andiriani MAYANG SARI Mega Safana Mega Sanjaya Melda Helena S Miftah Anugrah Mochamad Reizal Ath Thariq Moh. Tahang Mona Lisa Muchlis Ade Putra Muh Irwan Muhamad Hendri Diarta Muhamamad Rizky Zuriadi Muhammad Hamdani Mustika Canra MUTIARANI MUTIARANI Nanda Nabila Maharani Nasib Nisa Mulya Nissa Aqhilla Novika Sri Wardani Novirsari, Emma Nuraina Siregar Nurjamilah Nursyaniati Nursyaniati Nurul Afifah Ongky Alexander Opik Hidayat Abdul Latif Padil Pancasila Putri Peter Peter Puji Rahayu Purnama Sari Putri Arini Putri Julia Maemum Putri Rahmadani Rahmad Rasyidin Ramadani Pardian Ramadhana Eka Rani Handayani Rathesa Najela Ratih Amelia Rawdatul Fadila Reny Novianti Ridho Hafizh Maulana Ridho Wijaya Riki Rahmadhan Riko Ervil Rio Andika Rizky Gimnastiar Robin Roni Juliansyah Rozanna Sri Irianty Rusydy &#039; Sai Vinodhini Samsoni Samsoni Septiana Veronika S Septianing Tyas K Silvia Reni Renti Silvia Reni Yenti Silvia Reni Yenty Sintia Siska Priscillia Aledya Siti Chotijah Siti Nurkhaliza Sri Murda Niati Subkhan Maulana Sunarno Sunarno Syarifuddin Oko Syelvia Renni Yenti Thomson Simanjuntak Thufail Mujaddid Al-Qoyim Tina Linda Toni Ardi Ulfa Dwiyanti Ulfah Naida Marbun Wan Elsa Novtari Adiani Wasty Rusjaya Wilda Zakiah Wiriyan Jordy Wyda N Saragi Yelmida Azis Yesi Afriani Yopy Ratna Dewanti Yuli S Yunus Olivia Novanto Zubair Arza Zuchra Helwani Zulkarnain Lubis Zultiniar Zultiniar