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All Journal VALENSI CHEMISTRY PROGRESS PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman Science and Technology Indonesia Indonesian Journal of Chemistry Jurnal Riset Teknologi Industri JURNAL KIMIA SAINTEK DAN PENDIDIKAN Molekul: Jurnal Ilmiah Kimia Jurnal Sains dan Kesehatan
Subur P Pasaribu
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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PERBANDINGAN PENGUJIAN VISKOSITAS LUBE OIL DENGAN MENGGUNAKAN METODE ASTM D-445 DAN ASTM D-7042 Fahmi, Miraz’hul; Pasaribu, Subur P.
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Lubricant is one of the supporters so that the machine can operate optimally within a certain period of time so that the right viscosity is needed. This literature study aims to determine the appropriate method of testing the viscosity of a product. There are two different methods for testing viscosity, namely the ASTM D-445 and ASTM D-7042 methods. In this literature study, operational methods and scope of testing are compared between ASTM D-445 and ASTM D-7042 methods. Based on the results of the literature study, the ASTM D-445 method has a different method from ASTM D-7042. In ASTM D-445 it is a test to determine kinematic viscosity (ν) while in ASTM D-7042 it is a test which includes determining dynamic viscosity (η) and density (ρ). This literature study shows that the ASTM D-7042 method is very effective in the food industry, whereas the ASTM D-445 method is found to be very effective in the natural gas processing industry. Keywords: ASTM D-445, ASTM D-7042, Dynamic viscosity, Kinematic viscosity.
Penentuan Total Flavonoid Content (TFC) dan Aktivitas Antioksidan Tumbuhan Insulin (Smallanthus sonchifolius): Determination of Total Flavonoid Content (TFC) and Antioxidant Activity of Insulin Plants (Smallanthus sonchifolius) Erwin Erwin; Irna Febrianti; Subur P. Pasaribu; Abdul Aziz
Jurnal Sains dan Kesehatan Vol. 6 No. 4 (2024): J. Sains Kes.
Publisher : Fakultas Farmasi, Universitas Mulawarman, Samarinda, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25026/jsk.v6i4.2360

Abstract

Smallanthus sonchifolius or known by the local name Insulin or Yacon is a traditional medicinal plant commonly used to treat diabetes. Apart from being a diabetic drug, insulin also has the potential to have antioxidant, anticancer, and anti-melanogenic activities. The aim of the study was to determine total flavonoid content (TFC) and DPPH radical scavenging of Insulin bark and stem wood extracts using UV-Vis spectrometry. The calculation results show that the total flavonoid content equivalents to quercetin in Insulin bark and stem wood extracts is 29.2 and 210.2 mg QE/g extract, respectively, while the DPPH radical scavenging test results are 80.01 and 58.85 ppm, respectively. Both the TFC and the antioxidant properties of the stem wood extract were higher than that of the Insulin bark extract. Keywords:          Smallanthus sonchifolius, insulin, TFC, traditional medicine   Abstrak Smallanthus sonchifolius atau dikenal dengan nama lokal Insulin atau Yacon adalah tanaman obat tradisional yang biasa digunakan untuk pengobati penyakit diabetes. Selain sebagai obat diabetic, Insulin juga berpotensi memiliki aktivitas antioksidan, antikanker, dan anti-melanogenik. Tujuan penelitian adalah untuk menentukan total flavonoid content (TFC) dan peredaman radikal DPPH dari ekstrak kulit dan kayu batang Insulin menggunakan spektrometri UV-Vis. Hasil perhitungan menunjukkan total flavonoid content yang setara dengan quarcetin pada ekstrak kulit dan kayu batang Insulin adalah 29,2 dan 210,2 mg QE /g ekstrak, secara berturut-turut, sedangkan hasil uji peredaman radikal DPPH adalah 80,01 dan 58,85 ppm, secara berturut-turut. Baik TFC maupun sifat antioksidan ekstrak kayu batang lebih tinggi dibandingkan dengan ekstrak kulit batang Insulin. Kata Kunci:         Smallanthus sonchifolius, insulin, TFC, obat tradisional
VERIFIKASI METODE PENENTUAN SULFUR DIOKSIDA (SO2) PADA SAMPEL UDARA AMBIEN DENGAN METODE PARAROSANILIN MENGGUNAKAN SPEKTROFOTOMETER UV-VISIBELE Anwar, Adliah; Pasaribu, Subur P.; Panggabean, Aman Sentosa
JURNAL KIMIA MULAWARMAN Vol 22 No 1 (2024)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v22i1.1119

Abstract

The research about verification method on determination of sulfur dioxide (SO2) on ambient air samples with the pararosaniline method using UV-Vis Spectrophotometer has been done. To obtain a valid measuring result, some important parameters of measurement on sulfur dioxide (SO2) in ambient air samples based on SNI 7119-7:2017. The results showed that the linearity of the measurement was very good as indicated by the correlation coefficient value was 0.9998. The limit of detection and limit of quantization was 2.7766 g/Nm3 and 7.4111 g/Nm3 respectively. The value of precision was good shown by %RSD < 2/3 CV Horwitz, and the accuracy of this method was good shown by a recovery percentage of 101.12%. Based on the results of this research, the pararosanilin method can be used to analyze sulfur dioxide (SO2) in ambient air samples with good results.
IDENTIFIKASI KEBISINGAN DAN PENGUKURAN INDEKS SUHU BASAH DAN BOLA (ISBB) DI LINGKUNGAN KERJA PT. GLOBAL ENVIRONMENT LABORATORY (PT. GEL) Az-zahraa, Mutiara Nur; Pasaribu, Subur P.
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Research has been carried out on finding disturbances and measuring the wet and ball temperature index (ISBB) in the PT work environment. Global Environmental Laboratory with 24 locations. Identification of disturbances is measured using a sound level meter based on Ministerial Decree. Environment Number 48/MENLH/11-. /1996 and ISBB measurements using a heat stress monitor based on SNI 7061-2019 concerning Work Climate Measurement and Evaluation. The method used is quantitative primary data collection (based on numerical). This primary data is based on the results of disturbance measurements and ISBB values ​​which are then processed into secondary data. The secondary data that has been obtained is then analyzed and calculated. The aim is to determine the value of disturbance intensity and ISBB in the PT work environment. Global Environment Laboratory based on Minister of Industry Regulation Number 5 of 2018 concerning the Threshold Value for Physical Factors and Chemical Factors in the Workplace is 85 dBA and the heavy workload category is 27.5%. The research results show that the disturbance intensity and ISBB values ​​are below the NAB which does not endanger workers while at PT. Global Environmental Laboratory. Keywords: Noise, ISBB, NAB
REVIEW ARTIKEL: POTENSI LIDAH BUAYA (Aloe vera (L.) Burm. f.) SEBAGAI BAHAN DASAR PEMBUATAN EDIBLE FILM/COATING Mayang, Julia Agustin; Pasaribu, Subur P.; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Plastic is a very common packaging material in the food industry, due to its practicality, durability, and flexibility. However, its negative impact on the environment has prompted efforts to find more environmentally friendly alternatives. One promising solution is the development of edible films and coatings, which are made from edible materials and have biodegradable properties. Aloe vera has become an interesting material in the development of edible films and coatings due to its beneficial active compounds. This article conducts a review of the existing literature on the manufacture of aloe vera-based edible films and coatings. The literature review method was used to collect relevant information from various online sources. The results showed that aloe vera edible films and coatings have great potential in food packaging, because they are not only environmentally friendly and edible, but can also improve the quality and shelf life of food products. With the addition of additional ingredients such as gelatin, chitosan, starch, alginate, PVA, and CMC, the antimicrobial, antioxidant, and antifungal properties of the films and coatings can be enhanced. The use of aloe vera edible coatings has also been shown to affect the chemical, physical, and sensory properties of coated food products. In conclusion, the use of edible films and aloe vera coatings is promising as a sustainable alternative in food packaging, as they can increase protection of food products without compromising product safety or quality. Keywords : Aloe vera (L.) Burm.f.), edible films, edible coatings
VERIFIKASI METODE PENENTUAN KADAR AMONIA SEBAGAI NITROGEN (NH3-N) DALAM SAMPEL AIR BERSIH DENGAN METODE HACH 8155 DI PT BADAK NGL BONTANG Yusuf, Irfan Maulana; Pasaribu, Subur P.; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research about method verification for determination of ammonia levels as nitrogen (NH3-N) in clean water samples using the Hach 8155 method at PT Badak NGL Bontang has been done. Method verification was carried out by testing several verification parameters such as linearity tests, determining of instrumentation detection limits, detection limits of the method, quantification limits, repeatability, reproducibility and accuracy. The research results showed that the linearity test had good results with a correlation coefficient (R2) was 0.9992; instrumentation detection limit value was 0.01 mg/L; method detection limit value was 0.01 mg/L; quantification limit value was 0.03 mg/L; the repeatability value obtained from %RSD is less than 2/3 of the Horwitz CV; reproducibility value was 0.497 obtained from the Zscore value with acceptance requirements, namely 1.96 ≥ Zscore ≥ -1.96; and the accuracy value of the measured levels was 0.483 with a concentration range limit of 0.364 – 0.533 mg/L. The research results show that the Hach 8155 method can be used as a routine analysis method at PT. Badak NGL. Keywords : Method verification, ammonia, clean water, Hach 8155 method.
MINI REVIEW: PERBANDINGAN AKTIVITAS ANTIOKSIDAN BEBERAPA SPESIES DAUN SIRIH (Piper sp.) DAN POTENSINYA SEBAGAI TABIR SURYA Ningrum, Tika Setia; Purba, Ritson; Pasaribu, Subur P.
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The betel plant (Piper sp.) is a vine that is often used as a medicine or traditional potion. The part that is generally used as medicine is the leaves. Betel leaves can be used as an antiseptic, anti-dyslipid agent, anti-fungal, anti-inflammatory, anti-bacterial and antioxidant. The antioxidants in betel leaves can be used as sunscreen because they can reduce free radicals from exposure to sunlight. Antioxidant activity was tested using the DPPH (2,2 diphenyl-1-picryhydrazyl) method. In this article, a review of the antioxidant activity of various species of betel leaves is carried out, such as green betel leaves (Piper bettle), forest betel (Piper aduncum), Chinese betel (Pepperomia pellucida), yellow betel (Piper betle), and black betel (Piper acre). The results of the literature study show that the highest IC50 value is found in forest betel leaves (Piper aduncum) at 47.252 ppm and the lowest in black betel leaves (Piper acre) at 10.41 ppm. Based on that, the betel leaf that has the best antioxidant activity and potential as a sunscreen is black betel leaf (Piper acre). Keywords: Antioxidants, Betel Leaves, Sunscreen
REVIEW ARTIKEL: KARAKTERISASI EDIBLE FILM DARI KARAGENAN RUMPUT LAUT (Eucheuma Cottoni/Kappaphycus alvarezii) Nur, Nana Septiana; Pasaribu, Subur P.; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Seaweed is a type of multicellular organism with fast growth. Seaweed is quite abundant and is in great demand in several fields, both industrial and pharmaceutical. There are 3 types of seaweed, including brown with polysaccharides such as alginate, fucoidan and laminarin. Green seaweed with polysaccharides such as ulvan. Red with polysaccharides such as agar and carrageenan. Carrageenan is a hydrocolloid of Kappaphycus alvarezii/Eucheuma cottonii which has been extracted with an alkaline solution or water. Carrageenan has the property of being able to form a stable gel, is edible, renewable and rich in fiber so it has the potential to be used as an edible film. Edible film is a layer that can be eaten and has a role as a barrier to moisture. Based on the literature, making edible film from seaweed carrageenan with a higher concentration of seaweed results in a decrease in the transmittance value and transparency level of the edible film. The addition of a higher concentration also produces edible film with a lower water content, namely 21.16%, and has a tendency for slower dissolution compared to lower seaweed concentrations. The higher the concentration of carrageenan used in making edible film, the higher its solubility, the stronger its tensile strength, the thicker and more resistant it is, and the lower the vapor transmission rate or the higher the ability to hold water. Keywords: Seaweed (Eucheuma cottonii), carrageenan, edible film
KORELASI NILAI INHERENT MOISTURE TERHADAP NILAI CALORIFIC VALUE STANDAR AMERICAN SOCIETY OF TESTING AND MATERIALS (ASTM) DI PT TRIYASA PIRSA UTAMA SAMARINDA Josephine, Josephine; Pasaribu, Subur P.; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Coal is one of the main fuel sources for electricity generation in Indonesia. Coal contains inherent moisture water content and chemical calorific value. The Inherent Moisture value in coal is one of the main characteristics of coal that determines the quality of the coal. The calorific value of coal was determined from the values ​​of Total Moisture, Ash Content and Total Sulfur which are the determining parameters for coal quality. The aim of this research is to determine the correlation between the Inherent Moisture value and the Calorific Value of coal with ASTM standards. This research was conducted at PT Triyasa Pirsa Utama Samarinda using 10 different coal samples to analyze the Inherent Moisture value and Calorific Value. Based on the data from the analysis and graphs, a correlation between the Inherent Moisture (IM) and Calorific Value (CV) values ​​is inversely proportional, where the higher the IM value, the lower the CV value in the coal sample. The factors that influence changes in IM and CV values ​​are climate, weather, coal storage time and coal grain size degradation. Keywords: Coal, Moisture, Calorific Value, ASTM Standard.
MINI RIVIEW: POTENSI ASAM MALAT (2-hydrobutanedioic-acid) DAN TURUNANNYA SEBAGAI SURFAKTAN Rachmat, A. Khafifah Dwi; Daniel, Daniel; Pasaribu, Subur P.
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Malic acid (2-hydrobutanedioic-acid) is a dicarboxylic acid (carboxylic acid) which is generally found in many apples. Several malic acid derivatives have been synthesized through esterification and amidation reactions, including methyl malate, maleyl oleate and maleyl glutamide. Based on the results of FT-IR analysis of malic acid, it is known that there is an absorption peak at wave number 3448.72 cm¬-1 indicating the presence of an alcohol group and an absorption peak at wave number 1720.50 cm-1 indicating the presence of a carboxylic group. In methyl malate, it is known that in the wave number area of ​​1735.93 cm-1, stretching vibrations of the C=O ester carbonyl group occur. In maleyl oleate, the absorption in the wave area of ​​1743.65 cm-1 is a typical absorption from the stretching vibration of C=O ester. In maleyl glutamide, it is known that there is absorption at the peak wave number of 3425.58 cm-1 which is the stretching vibration of the NH (amide) group. The results of several literatures explain that the malic acid derivative, namely methyl malate, has an HLB value of 11.2 and can be used as an O/W (Oil in Water) emulsifier. The HLB value of maleyl oleate has a value of 4.61 which can be used as a W/O (Water in Oil) emulsifier and for maleyl glutamide the HLB is 14.84 which can be used as an O/W (Oil in Water) emulsifier. Therefore, malic acid derivatives have potential as materials for surfactant synthesis. Keywords: Malic Acid, Esterification and HLB (Hydrophilic Lipophilic Balance).
Co-Authors Abdul Aziz Ade R. Fajaryantie Aman S. Panggabean Aman Sentosa Panggabean Aman Sentosa Panggabean Andi Fatmawati Padri Hasanah Anggun Ridha Avitri Anggun Ridha Avitri Anwar, Adliah Arie Novadiana Arie Novadiana, Arie Az-zahraa, Mutiara Nur Bagus Muliawan Bohari Bohari Bohari Bohari Bonita Tahir Buchari Buchari Chairul Saleh Chairul Saleh Daniel Daniel Daniel Daniel T Daniel T, Daniel Djihan Ryn Pratiwi, Djihan Ryn Erwin - Erwin - Erwin Erwin Erwin Erwin Erwin Erwin Eva Marliana, Eva Fadilah Ramadhani Fahmi, Miraz’hul Farida Kristiana Hairani, Rita Hairus Abdullah Hardy Shuwanto Ika Y. L. Sari Indra Masmur Irna Febrianti Irna Febrianti Jamaran Kaban Jenni Lie Josephine Josephine, Josephine Juntia Kirana Pratiwi Kasmirul Ramlan Sinaga Lianasari, Ika Yekti M. Bachri Amran Magdaleni, Agustina Rahayu Margaretta D. R. N. S Masmur, Hestina Mayang, Julia Agustin Mimpin Ginting Muhammad Robiansyah Nanang Tri Widodo Ningrum, Tika Setia Noviyanti Y Noviyanti Y, Noviyanti Nur, Nana Septiana Nurhasanah Nurhasanah Oktavia, Dwina Putri Putri Istiyanti Putri Istiyanti, Putri Putri, Amelia Rachmat, A. Khafifah Dwi Rico Ramadhan, Rico Ritson Purba, Ritson Rohmat Hidayat Rohmat Hidayat Rudi Kartika, Rudi Ruga, Ritbey Rumengan, Nur Khamillah Saibun Sitorus Shintia Alifah R Sujito Sujito Teguh Wirawan Wahidatul Nuriah Winni Astuti Wirdhaningsih Wirdhaningsih Yusuf, Irfan Maulana Zia Rahmana Putra