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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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Journal : PROSIDING SEMINAR KIMIA

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EKSTRAKSI DAN PREPARASI GLUKOMANAN UMBI PORANG (Amorphophallus muelleri Blume) SEBAGAI EDIBLE FILM Juntia Kirana Pratiwi; Subur P. Pasaribu; Chairul Saleh; Aman Sentosa Panggabean
PROSIDING SEMINAR KIMIA Vol 1 No 2 (2023): Prosiding SNKT II 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Glucomannan extracted from porang tubers (Amorphophallus muelleri Blume) can be used as a raw material for made edible films. In this research, extraction of glucomannan with graded ethanol method resulted in a yield of 10% and the composition of the edible film forming solution used was 6% glucomannan porang tubers and 25% (w/w) glycerol. The resulted edible film was clear and transparent with the characteristics tested are water content, thickness and water vapor transmission respectvely 20.16%, 0.15 m2 and 22.89 g/m2/hour. Based on the results of SEM analysis showed that the surface of the edible film of glucomannan porang tubers, the morphology of the surface was somewhat smooth but still less homogeneous. So, efforts are still needed to improve the characteristics so that to acording the required standards Keywords: Preparation, edible film, glucomannan, porang tubers
DETERMINATION OF CONTAMINATION LEVELS OF HEAVY METALS LEAD (Pb) AND CADMIUM (Cd) IN FOOD SAMPLES BY CARBON ATOMIC ABSORPTION SPECTROPHOTOMETRY (GRAPHITE FURNACE ATOMIZER AAS/ GF-AAS) Oktavia, Dwina Putri; Panggabean, Aman Sentosa; Pasaribu, Subur P.; Widodo, Nanang Tri
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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Research on the determination of lead (Pb) and cadmium (Cd) heavy metal contamination levels using the GFA-AAS method has been carried out in food samples. The aim of this study was to determine the levels of lead (Pb) and cadmium (Cd) metal contamination so that they do not exceed the threshold limit set according to the Food and Drug Supervisory Agency Regulation No. 9 of 2022. The research was carried out by destroying the sample using HNO3(p) and H2O2(p) into microwave. Additions were made of matrix modifiers (mixture of Mg(NO­3)2. 6H2O in 0,5% HNO3 and 1% NH4H2PO4 in 0,5% HNO3 (1:1)). Determination of heavy metal content in food was determined by the Carbon Furnace Atomic Absorption Spectrophotometry (GFA-AAS) method with a wavelength of 283.3 nm for lead (Pb) and 228.8 nm for cadmium (Cd). The results of measuring the levels of heavy metal lead (Pb) contamination in food samples were 0,016 mg/kg and 0,015 mg/kg for the heavy metal cadmium (Cd). Based on the Regulation of the Food and Drug Supervisory Agency No 9 of 2022 concerning Requirements for Heavy Metal Contamination in Processed Foods, the maximum limit for metal contamination of lead (Pb) and cadmium (Cd) in processed food is 0,30 mg/kg, where the results obtained do not exceed threshold, so that the sample is fit for consumption. Keywords: Lead, Cadmium, Carbon Furnace Atomic Absorption Spectrophotometry, Food.
SYNTHESIS AND SWELLING PROPERTIES OF CHITOSAN-BASED HYDROGELS CROSSLINKED FORMALDEHYDE AND TRIPOLYPHOSPHATE Ramadhani, Fadilah; Pasaribu, Subur P.; Panggabean, Aman Sentosa
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

Hydrogel is a hydrophilic polymer network that can experience swelling with the ability to absorb and retain large amounts of liquid without decomposing and is widely applied in the fields of health, environment and agriculture. The swelling properties of hydrogels are influenced by the type of tissue and the density of crosslinks that form it. In this study the hydrogel was prepared by stirring a 2% chitosan solution (w/v) as much as 7 mL with 3 ml of formaldehyde-tripolyphosphate crosslinking mixture at variations of 3:0, 2:1, 1:1, 1:2 and 0:3 (v/v) at room temperature and swelling tests were carried out by immersing each hydrogel produced in aquades for a span of 24 hours at the same temperature. Based on the observations, the gel formation time was 420, 97, 84, 75 and 58 minutes respectively which showed the lower the chitosan concentration and the higher the tripolyphosphate, the faster the gel formation process. Then the degree of consecutive sweling was 581.43; 78,23; 75,17; 48.85 and 20.97% (w/w) indicate that covalent cross-networks formed by amine groups on chitosan with aldehyde groups on formaldehyde are more stable and more difficult to degrade than physical cross-networks formed by groups on chitosan and tripolyphosphates. Keywords: Hydrogel, Crosslinking, Chitosan-tripolyphosphate, Degree of swelling.
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.
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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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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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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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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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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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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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.
Co-Authors Abdul Aziz Ade R. Fajaryantie Aman S. 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 Eva Marliana, Eva Fadilah Ramadhani Fahmi, Miraz’hul Farida Kristiana Febrianti, Irna Hairani, Rita Hairus Abdullah Hardy Shuwanto Ika Y. L. Sari Indra Masmur 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, Teguh Wahidatul Nuriah Winni Astuti Wirdhaningsih Wirdhaningsih Yusuf, Irfan Maulana Zia Rahmana Putra