JURNAL KIMIA MULAWARMAN
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    227 research outputs found

    Studi Molekul Kitosan Sebagai Membran Penghantar Proton (H) Dengan Metode Ab Initio

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    The aim of this research to know chitosan compound able to replace nafion performance as a conductor of proton (H+). The assessment process and computational chemistry calculations done using ab initio methods. The analysis showed chitosan energy is -1384.7601 eH and chitosan energy after bringing proton (H +) decreased respectively by -1385.2275 eH, -1385.8487 eH, -1386.3393 eH, -1386.9652 eH, -1387.4508 eH. The result obtained proved of chitosan becomes stable so that it can be used as a proton conductor.Penelitian ini bertujuan untuk mengetahui apakah senyawa kitosan mampu menggantikan kinerja nafion sebagai penghantar proton (H+). Proses pengkajian dan perhitungan dilakukan secara kimia komputasi dengan menggunakan metode ab initio. Hasil analisis menunjukkan nilai energi kitosan sebesar -1384.7601 eH dan energi kitosan setelah membawa proton (H+) mengalami penurunan masing-masing sebesar -1385.2272 eH, -1385.8487 eH, -1386.3393 eH, -1386.9652 eH, -1387.4508 eH. Hal ini membuktikan bahwa kitosan menjadi stabil sehingga mampu digunakan sebagai penghantar proton (H+)

    CHITOSAN-BASE COAGULANTS IN COAGULATION-FLOCCULATION OF KAOLIN SUSPENSION

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    Coagulation-flocculation is one of the waste water treatments using coagulant/flocculants agent. Using coagulant/flocculants based on natural polymers were many used due to many available, renewable source, and environment friendly. One of that coagulant/flocculants was chitosan that can be produced through deacetylation of chitin. Amino groups in the chitosan structure play important role in the coagulant/flocculants process. The aim of research is using chitosan-based coagulants in the coagulation-flocculation of kaolin suspension. In here, there were two coagulants type, first, single coagulant which chitosan with different molecular weight  added alone in kaolin suspension. Second, mix coagulants which chitosan aid with alum in kaolin suspension. As the result, functional group analysis showed that chitosan with different molecular weight have the same functional groups. Increasing molecular weight of chitosan increase NH2 groups and degree of deacetylation. The removing turbidity of kaolin suspension showed that increasing molecular weight chitosan increase removing turbidity of kaolin suspension. Using double coagulant (chitosan and tawas) have the removing turbidity greater than single coagulant

    MODIFIKASI KARET ALAM SIKLIS DENGAN KOMONOMER MALEAT ANHIDRAT DAN ASAM OLEAT MELALUI METODE PENCANGKOKKAN DENGAN TEKNIK REFLUKS MENGGUNAKAN INISIATOR BENZOIL PEROKSIDA

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    Penelitian mengenai modifikasi Karet Alam Siklis (KAS) dengan komonomer maleat anhidrat (MA) dan karet alam siklis (KAS) dengan komonomer asam oleat (AO) melalui metode grafting dengan teknik refluks menggunakan inisiator Benzoil Peroksida (BPO) telah dilakukan, yang bertujuan untuk mengetahui komonomer yang paling baik antara maleat amhidrat (MA) dengan asam oleat (AO) dalam memodifikasi KAS menggunakan inisiator BPO membentuk material baru yaitu KAS-g-MA dan KAS-g-AO, yang hasilnya dilakukan pengujian persentase derajat grafting dan dianalisis menggunakan spektroskopi FTIR. Modifikasi ini dilakukan dengan cara melarutkan sejumlah KAS dengan xylena pada suhu 45-55oC, kemudian dicampurkan larutan KAS tersebut dengan MA atau AO, yang dilanjutkan dengan penambahan inisiator BPO, sambil tetap diaduk selama satu jam, dicuci dengan etanol dan aseton, didiamkan dalam desikator, dan hasil yang diperoleh diketahui bahwa pada nilai dearajat grafting KAS-g-MA sebesar 1,49% sedangkan pada KAS-g-AO sebesar 3,34%. Hasil analisis dengan FTIR, untuk MA dan AO keduanya menunjukkan bahwa ada pemunculan serapan tajam pada bilangan gelombang 1711,23 cm-1 (MA) dan 1709,88 cm-1 (AO) yang mengindikasikan adanya gugus karbonil C=O, hal ini berarti kedua komonomer tersebut benar telah tercangkok pada KAS

    DAYA HAMBAT EKSTRAK ETANOL SABUT KELAPA (Cocos nucifera Linn) TERHADAP PERTUMBUHAN Staphylococcus aureus DAN Escherichia coli PADA TAHU

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    Telah dilakukan pengujian daya hambat ekstrak etanol sabut kelapa (Cocos nucifera Linn) terhadap pertumbuhan Staphylococcus aureus dan Escherichia coli pada tahu. Penelitian ini bertujuan untuk mengetahui konsentrasi ekstrak etanol sabut kelapa yang dapat menghambat pertumbuhan mikroba S.aureus dan E.coli pada tahu. Sabut kelapa diekstrak menggunakan etanol 96% dan di aplikasikan pada tahu dengan variasi konsentrasi 1000 ppm, 2000 ppm, 3000 ppm, 4000 ppm, 5000 ppm, 6000 ppm dan 7000 ppm. Selanjutnya diaplikasikan pada tahu dengan metode cawan menggunakan total plate count. Hasil perendaman ekstrak etanol sabut kelapa terhadap tahu menunjukkan konsentrasi ekstrak yang paling menghambat yaitu pada konsentrasi 7000 ppm dengan waktu 24 jam sebesar 3751 Cfu/mL untuk bakteri S.aureus dan konsentrasi 7000 ppm dengan waktu 96 jam pada bakteri E.coli. Ambang batas cemaran mikroba pada tahu sesuai SNI 2009 nomor 7388 yaitu 5×104 koloni/mL

    PEMBUATAN SENYAWA METIL ESTER YANG DITURUNKAN DARI DARI MINYAK BIJI BINTARO (Cerbera manghas L.) SEBAGAI BAHAN BAKU DASAR PEMBUATAN SURFAKTAN

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    Synthesis methyl ester can be formed from kernel bintaro oil (Carberra Mangas L.) with two stages which is esterification and trans-esterification. The test result of methyl ester of bintaro kernel oil have iod value 92,82 g iod/100 gr oil, acid value 1,67 mg KOH/g oil with acid concentration 12,470% and saponification value 185.225 mg KOH/gr oil. From GC-MS analysis fatty acid dominant composition from methyl ester is methyl oleat with walue 45.86%. From HLB analysis show value 0,539. Result of analysis of FT-IR show methyl ester from bintaro kernel oil have typical absorbtion peak on wave number 17443.65 (C=O Ester). &nbsp

    UJI ANTIBAKTERI Ag/SBA-15 DARI ABU DAUN BAMBU PETUNG TERHADAP BAKTERI Escherichia coli

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    Antibacterial tests of Ag/SBA-15 from petung bamboo leaf ash against Escherichia coli were carried out. Modification of SBA-15 with Ag was conducted using the wet impregnation method while the antibacterial test was carried out by well diffusion method and disc diffusion method with various concentrations of Ag/SBA-15. The Ag/SBA-15 has a surface area of ​​143 m2/g, pore diameter of 8.4 nm and pore volume of 0.35 cm3/g. The SAXS pattern of   Ag /SBA-15 showed 3 typical SBA-15 peaks in the 0o -2o 2θ range with the miller index [100], [110] and [200], indicating modification with Ag did not change the hexagonal structure of SBA-15. Ag / SBA-15 material has the potential as an antibacterial agent for Escherichia coli; the inhibitory zone diameters for the well diffusion method and disc diffusion method were 7.00 ± 0.57 mm and 13.16 ± 0.16 mm, respectively. Increasing the concentration of Ag/SBA-15 samples resulted in greater inhibitory zone diameters for the bacteria

    AKTIVASI BIOCHAR DARI KAYU Macaranga gigantea MENGGUNAKAN ZnCl2

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    Aktivasi biochar hasil pirolisis lambat Macaranga gigantea dengan ZnCl2 telah dilakukan. Penelitian ini bertujuan untuk mengetahui karakteristik dari biochar sebelum dan sesudah aktivasi. Tahap yang dilakukan meliputi preparasi biochar dan aktivasi menggunakan ZnCl2 yang selanjutnya dikarakterisasi menggunakan TGA, FTIR dan SEM. Hasil analisa TGA menunjukkan kadar abu (%) biochar sesudah aktivasi (6,38%) lebih besar dibandingkan biochar sebelum aktivasi (1,71%), kadar zat terbang (%) biochar sebelum aktivasi (46,83%) lebih besar dibandingkan biochar sebelum aktivasi (10,29%) dan kadar karbon terikat (%) biochar sesudah aktivasi (66,28%) lebih besar dibandingkan biochar sebelum aktivasi (47,03%). Analisa FTIR biochar sebelum aktivasi menunjukkan adanya gugus –OH, C=C, C-H, C=O dan CN, sedangkan biochar sesudah aktivasi menujukkan adanya gugus C=C dan CO. Analisa SEM menunjukan adanya perbedaan morfologi biochar sebelum aktivasi dengan sesudah aktivasi

    STUDI POTENSI SENYAWA DERIVATIF FLAVONOID DARI TANAMAN GENUS MACARANGA TERHADAP PROTEIN E6 HPV DENGAN METODE DOCKING MOLECULAR

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    Interaction study of active compounds of a medicinal plant with cervical cancer cells using the Docking Molecular (In Silico) method. In this research design the active compound sophoraflavanone B, 5,7,3 \u27, 4\u27-tetrahidroxy-3,6-diprenylflavone, apigenin and quercetin are first calculated using a quantum approach based on SCF method set 3-21G to obtain a stable compound form and has the lowest energy. Stable compounds interact with cervical cancer cells obtained from protein bank data (GDP) that have been prepared previously to obtain an inhibitory energy value, the number of hydrogen bonds and other factors that influence a Docking Molecular calculation. The interaction of compounds 5,7,3 \u27, 4\u27-tetrahydroxy-3,6-diprenylflavone against E6-HPV of 4 hydrogen bonds with a distance of 2.7-3.23 Å

    ANALISIS KADAR ION BESI (Fe2+) DAN ION TIMBAL (Pb2+) DALAM IKAN MAKAREL KEMASAN KALENG BERDASARKAN LAMA WAKTU PENYIMPANAN

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    Analysis of iron ion (Fe2+) and lead ion (Pb2+) content in canned mackerel based long storage time has been investigated. The content of iron ion (Fe2+) and lead ion (Pb2+) has been analysed used the instrument Atomic Absorption Spectrophotometer (AAS). Based on long storage time result analysis of the content of iron ion (Fe2+) in canned mackerel the lowest is 2,71 mg/Kg with long storage time of 33 month and the highest is 5,21 mg/Kg with long storage time of 9 month while the result analysis of lead ion (Pb2+) in canned mackerel is not detected. Based on the result conclude is long storage time not affect the levels iron ion (Fe2+) and lead ion (Pb2+) in canned mackerel. &nbsp

    SINTESIS SURFAKTAN TURUNAN AMIDA YANG DIPEROLEH DARI REKASI METIL RISINOLEAT DAN ETILENDIAMINA

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    Interesterification of castor oil with methanol using base catalyst gave mixture of fatty acid methyl esther (FAME) castor oil. Methyl risinoleate as major composition of methyl esther castor oil was subjected to column chromatography using petroleum ether:diethyl ether (19:1, v/v) as eluent, to give yield 73%. Amidation of methyl risinoleate with ethylendiamine under refluks condition using benzene as solvent for  ± 12 hours and catalyst NaOCH3, gave 1,3–Dirisinoleil-Etilendiamida compound and 59% yield. The reactioned product 1,3–Dirisinoleil-Etilendiamida has been confirmed its structure using FT-IR spectroscopy, and Hidrofile Lipofile Balance (HLB) value was determined by titration method 12,5

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