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All Journal Jurnal Fisika FLUX Indonesian Journal of Chemistry Akta Kimia Indonesia Chemistry Indonesian Journal of Chemical Research Jurnal Pelayanan dan Pengabdian Masyarakat (Pamas) Jurnal Pengabdian Kepada Masyarakat (Mediteg) Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Molekul: Jurnal Ilmiah Kimia

Dewi Umaningrum

Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Lambung Mangkurat University, Jl. A. Yani Km 35,8 Banjarbaru, Kalimantan Selatan, 70714

Author-ID : 407671

Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences

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PEMBUATAN HAND SANITIZER ALAMI DI DESA CEMPAKA BARU KOTA BANJARBARU Noer Komari; Dwi Rasy Mujiyanti; Dewi Umaningrum; Dahlena Ariyani
Jurnal Pengabdian Kepada Masyarakat (MEDITEG) Vol 6 No 1 (2021): Jurnal Pengabdian Kepada Masyarakat (MEDITEG)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Tanah Laut (Politala)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/mediteg.v6i1.81

The spread of Covid-19 was out of control and spread throughout Indonesia, including Banjarbaru which had a red zone. Desa Cempaka Baru Kota Banjarbaru is a transmigration settlement that is still safe against Covid-19. Even though it is safe, the community is quite at high risk of contracting it. People are required to comply with health protocols, especially cleaning their hands, including using a hand sanitizer. The demand for hand sanitizers in the market is increasing and the price is also rising, so an alternative is needed to make your own hand sanitizer. The aim of the activity is to educate village communities to make hand sanitizers by utilizing materials around their environment. The activity stages include socialization, implementation of making hand sanitizers, and evaluation. Assistance in the form of hand sanitizer products, hand washing stations, and banners advising the prevention of Covid-19 transmission were also provided to the public. The process of making hand sanitizers was demonstrated by students who helped with activities and involved 15 women who were members of the “Sasirangan Working Group”. The service product is a natural hand sanitizer made from lemongrass and betel leaves. The community was very enthusiastic about participating in this activity and promised to make their own later.

Perbandingan Metode Potensiometri dan Spektrofotometri pada Penentuan Formalin Dewi Umaningrum; Radna Nurmasari; Maria Dewi Astuti; Ani Mulyasuryani; Diah Mardiana
Jurnal Fisika FLUX Vol 1, No 1 (2019): Jurnal Fisika Flux Edisi Khusus Januari 2019
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v1i1.6148

Penelitian tentang penentuan formalin menggunakan metode potensiometri dan spektrofotometri telah dilakukan. Tujuan dari penelitian ini adalah untuk membandingkan hasil pengukuran kadar formalin antara metode potensiometri menggunakan sensor berbasis Screen Printed Carbon Electrode (SPCE) dengan metode standar spektrofotometri. Metode penelitian diawali dengan membuat sensor formalin yang digunakan untuk mengukur kadar formalin menggunakan selulosa asetat sebagai ionofor. Tahap berikutnya adalah mengukur kadar formalin sampel menggunakan sensor dan metode standar spektrofotometri. Hasil pengukuran kadar formalin kemudian dibandingkan diantara kedua metode tersebut. Hasil penelitian menunjukkan bahwa pada penentuan formalin antara kedua metode tersebut tidak menunjukkan beda nyata.

Pembuatan Sensor Methanil Yellow Tipe Kawat Terlapis Berbasis Kitosan menggunakan Dioktil Sebakat (DOS) sebagai Plasticizer Dewi Umaningrum
Akta Kimia Indonesia Vol 6, No 1 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25493736.v5i2.7829

Pembuatan sensor methanil yellow tipe kawat terlapis berbasis kitosan telah dilakukan dengan menggunakan dioktil sebakat (DOS) sebagai plasticizer. Tujuan penelitian ini adalah menentukan komposisi campuran membran optimum dan waktu perendaman optimum. Variasi komposisi campuran membran yang digunakan adalah kitosan:PVC:DOS = 3:34:62 (komposisi 1), 3:35:62 (komposisi 2), 4:34:62 (komposisi 3), 4:35:61 (komposisi 4), 5:33:62 (komposisi 5), 5:34:62 (komposisi 6), 5:35:60 (komposisi 7) dilarutkan dalam pelarut THF (1:3). Waktu perendaman membran dilakukan pada rentang waktu 10 - 80 menit. Hasil penelitian menunjukkan komposisi campuran membran optimum yang pada komposisi membran (3) 4:34:62 pada waktu perendaman optimum pada 30 menit

IMMOBILIZATION OF HUMIC ACID ONTO CHITOSAN USING TOSYLATION METHOD WITH 1,4-BUTANEDIOL AS A SPACER ARM Uripto Trisno Santoso; Radna Nurmasari; Dewi Umaningrum; Sri Juari Santosa; Bambang Rusdiarso; Dwi Siswanta
Indonesian Journal of Chemistry Vol 12, No 1 (2012)
Publisher : Universitas Gadjah Mada

Immobilization of humic acid (HA) onto chitosan using tosylation method with 1,4-butanediol as a spacer arm has been evaluated. Chitosan was phthaloylated selectively using phthalic anhydride in dimethylformamide as solvent with addition of 5% water (v/v) as cosolvent prior to be tosylated. N-phthaloyl-chitosan and HA were tosylated using tosyl chloride in excess and triethylamine as catalyst at temperature < 10 °C for 12 h. The 6-O-tosyl-N-phthaloyl-chitosan was reacted with 1,4-butanediol in order to obtain a spacer arm attached chitosan. The 6-O-butanol-N-phthaloyl-chitosan was activated by reacting with tosyl chloride. For evaluation on immobilization of HA on chitosan with and without spacer arm, 6-O-tosylbutane-N-phthaloyl-chitosan was reacted with HA and the 6-O-tosyl-N-phthaloyl-chitosan was reacted with HA. The HA immobilized onto chitosan was characterized by XRD and FTIR spectrophotometric method. The result showed that HA can be immobilized covalently onto chitosan after attaching 1,4-butanediol as spacer arm onto 6-O-tosyl-N-phthaloyl-chitosan and activating the product with tosyl chloride, but HA cannot be reacted directly onto 6-O-tosyl-N-phthaloyl-chitosan.

ADSORPTION KINETICS OF Pb(II), Cd(II) AND Cr(III) ON ADSORBENT PRODUCED BY PROTECTED-CROSSLINKING OF HUMIC ACID-CHITOSAN Dewi Umaningrum; Uripto Trisno Santoso; Radna Nurmasari; Rahmat Yunus
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

Study on adsorption kinetics of of Pb(II), Cd(II) and Cr(III) on adsorbent which was produced by protected-crosslinking of humic acid-chitosan has been done. The Langmuir-Hinshelwood, pseudo first- and second-order kinetics models were used to describe the kinetic data, and the rate constants of adsorption were also evaluated. The experimental data fitted well the second-order kinetics model, indicating that the chemical sorption is the rate-limiting step, instead of mass transfer. The initial metal ion concentration significantly affects the adsorption rate. An increase in initial metal ion concentration results in the decrease in adsorption rate of the metals.

IMMOBILIZATION OF HUMIC ACID ON CHITOSAN BEADS BY PROTECTED CROSS-LINKING METHOD AND ITS APPLICATION AS SORBENT FOR Pb(II) Radna Nurmasari; Uripto Trisno Santoso; Dewi Umaningrum; Taufiqur Rohman
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

Immobilization of humic acid (HA) on chitosan beads has been done using a protected cross-linking reaction method and the product was then utilized as sorbent for Pb(II). Protection of the active sites of HA was carried out by interacting HA with Pb(II) before performing the cross-linking reaction in order to maintain its adsorption capacity. Protected-HA was cross-linked with chitosan beads using glutaraldehyde in order to obtain sorbent insoluble both in aqueous acidic and basic solution. The result showed that the amount of immobilized HA on beads chitosan was 88.60% by weight. The adsorption capacity of the protected-sorbent beads for Pb(II) was 784 mg/g. As a comparison, the adsorption capacity of the non-protected sorbent beads for Pb(II) was only 142 mg/g.

IMMOBILIZATION OF HUMIC ACID ON CHITOSAN USING PROTECTED CROSS-LINKING REACTION METHOD AND ITS APPLICATION AS SORBENT FOR Pb(II), Cd(II), AND Cr(III) Uripto Trisno Santoso; Dewi Umaningrum; Utami Irawati; Radna Nurmasari
Indonesian Journal of Chemistry Vol 8, No 2 (2008)
Publisher : Universitas Gadjah Mada

Immobilization of humic acid (HA) on chitosan has been done by using a protected cross-linking reaction method and the product was then utilized as sorbent for Pb(II), Cd(II), and Cr(III). HA was cross-linked with chitosan by using glutaraldehyde in order to obtain sorbent insoluble in aqueous acidic and basic solution. Protection of the active sites of HA was carried out by interacting HA with Pb(II) before performing the cross-lingking reaction in order to maintain its adsorption capacity The result showed that the amount of immobilized HA on chitosan was 99.7% by weight. The solubility of the immobilized HA were < 0.5% at pH 6 and < 1.0% at pH 12. The amount of immobilized HA and its solubility indicated that the protection pretreatment did not interfere the cross-linking reaction between HA and chitosan. The adsorption capacity of the sorbent for Pb(II), Cd(II), and Cr(III) were 416.7 mg/g, 332.3 mg/g, dan 714.3 mg/g, respectively.

ELARUTAN FOSFAT YANG TERJERAP PADA TANAH MINERAL MASAM OLEH ASAM FULVAT DARI TANAH GAMBUT Uripto Trisno Santoso; Dewi Umaningrum; Radna Nurmasari; Amelia Harianti
Jurnal Sains dan Terapan Kimia Vol 9, No 1 (2015)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Telah dilakukan kajian efektivitas asam fulvat dalam melarutkan fosfat yang terjerap pada tanah mineral masam pada skala laboratorium. Dua parameter yang mempengaruhi pelarutan fosfat, yakni konsentrasi awal asam fulvat dan waktu reaksi, telah dipelajari secara statistik. Hasil penelitian menunjukkan bahwa waktu reaksi mempengaruhi jumlah P-tersedia secara signifikan. Keberadaan asam fulvat dapat melarutkan fosfat yang terjerap secara signifikan. Namun demikian, variasi konsentrasi asam fulvat 50 hingga 250 ppm tidak meningkatkan kemampuan asam fulvat dalam melarutkan fosfat yang terjerap tetapi pada konsentrasi asam fulvat 500 ppm terjadi peningkatan P-tersedia secara signifikan. Kata kunci: asam fulvat, pelarutan, fosfat, tanah mineral masam

ISOLASI SELULOSA DARI JERAMI PADI MENGGUNAKAN VARIASI KONSENTRASI BASA Dewi Umaningrum; Radna Nurmasari; Maria Dewi Astuti; Mardhatillah Mardhatillah; Ani Mulyasuryani; Diah Mardiana
Jurnal Sains dan Terapan Kimia Vol 12, No 1 (2018)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Telah dilakukan penelitian tentang isolasi selulosa dari jerami padi menggunakan variasi konsentrasi basa. Pada penelitian ini dipelajari tentang pengaruh basa dan variasi konsentrasinya dalam isolasi selulosa dari jerami padi. Kajian pengaruh basa dan konsentrasi dilakukan dengan melarutkan ekstrak jerami padi pada NaOH dan KOH dengan variasi konsentrasi 1%, 3%, 5%, 7% dan 9% dan kemudian dilakukan analisis IR terhadap selulosa hasil isolasi serta dihitung rendemen selulosa dan lignin sisa. Hasil penelitian menunjukkan bahwa pada isolasi selulosa dari jerami padi digunakan NaOH 7% dengan rendemen selulosa yang diperoleh sebesar 33,63% dengan lignin sisa sebesar 2,42%.Kata kunci : isolasi, selulosa, lignin sisa

TOKSISITAS EKSTRAK N-HEKSANA DAN METANOL DAUN KELOPAK TAMBAHAN TUMBUHAN PERMOT (Passiflora foetida L) Maria Dewi Astuti; Dewi Umaningrum; Kamilia Mustikasari
Jurnal Sains dan Terapan Kimia Vol 8, No 2 (2014)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Telah dilakukan penelitian tentang skrining fitokimia dan uji toksisitas ekstrak n-heksana dan metanol dari daun kelopak tambahan tumbuhan permot (Passiflora foetida L). Skrining fitokimia dilakukan berdasarkan uji kualitatif dengan pereaksi spesifik untuk fitokimia tertentu dan uji toksisitas dilakukan berdasarkan metode BSLT (Brine Shrimps Lethality Test). Hasil penelitian tentang skrining fitokimia menunjukkan bahwa ekstrak n-heksana mengandung alkaloid, flavonoid, dan steroid sedangkan ekstrak metanol mengandung alkaloid, flavonoid, tanin, triterpenoid, steroid, dan saponin. Uji toksisitas memperlihatkan bahwa ekstrak metanol lebih toksik (LC50 546,56 ppm) daripada ekstrak n-heksana (LC50 821,41 ppm). Kata kunci: skrining fitokimia, uji toksisitas, permot, Passiflora foetida L, daun kelopak tambahan

Co-Authors A.A. Ketut Agung Cahyawan W Abdullah Abdullah Ade Mutia Rahmah Ahmad Budi Junaidi Amelia Harianti Ani Mulyasuryani Ari Wahyudi Azidi Irwan Bambang Rusdiarso Budi Junaidi, Budi Dahlena Ariyani Diah Mardiana Diah Mardiana Dwi Nurwijayanti Dwi Rasy Mujiyanti Dwi Rasy Mujiyanti Dwi Siswanta Eka Yuliyanti Hasanuddin Hasanuddin Hermin Sulistyarti Idris, Muddatstsir Ika Kusuma Nugrahaeni Ika Kusuma Nugraheni Isnani Yuniarti Kamilia Mustikasari Mardhatillah Mardhatillah Maria Dewi Astuti Noer Komari Pradita, Hapsari Tyas Radna Nurmasari Rahmat Eko Sanjaya Rahmat Yunus Rahmat Yunus Raihanah Raihanah Raihanah Raihanah Resna Maulia Rodiansono Rodiansono Seniwaty Seniwaty Sri Juari Santosa Sunardi Sunardi Syana Asri Nurmuhaimina Taufiqur Rohman Umi Baroroh Lili Utami Uripto Trisno Santoso Utami Irawati Wiwin Tyas Istikowati Yunitawati Yunitawati

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