Subjects -> CHEMISTRY (Total: 1021 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (746 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (49 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (746 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal  
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 36)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 14)
ACS Catalysis     Hybrid Journal   (Followers: 76)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 25)
ACS Combinatorial Science     Hybrid Journal   (Followers: 25)
ACS Macro Letters     Hybrid Journal   (Followers: 34)
ACS Materials Letters     Open Access   (Followers: 3)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 49)
ACS Nano     Hybrid Journal   (Followers: 448)
ACS Photonics     Hybrid Journal   (Followers: 19)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 40)
Acta Chemica Iasi     Open Access   (Followers: 8)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 81)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 15)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 14)
Advanced Science Focus     Free   (Followers: 7)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 108)
Advances in Chemical Science     Open Access   (Followers: 50)
Advances in Chemistry     Open Access   (Followers: 39)
Advances in Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 21)
Advances in Drug Research     Full-text available via subscription   (Followers: 27)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Enzyme Research     Open Access   (Followers: 13)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 20)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 35)
Advances in Nanoparticles     Open Access   (Followers: 20)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 20)
Advances in Polymer Science     Hybrid Journal   (Followers: 53)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 22)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 7)
Advances in Science and Technology     Full-text available via subscription   (Followers: 17)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Aggregate     Open Access   (Followers: 3)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 3)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 5)
Alchemy : Jurnal Penelitian Kimia     Open Access   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 71)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 24)
American Journal of Chemistry     Open Access   (Followers: 41)
American Journal of Plant Physiology     Open Access   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 40)
Analytical Science Advances     Open Access   (Followers: 2)
Angewandte Chemie     Hybrid Journal   (Followers: 235)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 353)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 8)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 6)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 13)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 16)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 12)
Applied Spectroscopy     Full-text available via subscription   (Followers: 27)
Applied Surface Science     Hybrid Journal   (Followers: 33)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 3)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access   (Followers: 2)
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 3)
Atomization and Sprays     Full-text available via subscription   (Followers: 8)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 484)
Biochemistry Insights     Open Access   (Followers: 7)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 11)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 3)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 4)
Biomacromolecules     Hybrid Journal   (Followers: 27)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 11)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 4)
BioNanoScience     Partially Free   (Followers: 6)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 213)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 88)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 4)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 26)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 13)
Canadian Mineralogist     Full-text available via subscription   (Followers: 7)
Carbohydrate Polymer Technologies and Applications     Open Access   (Followers: 3)
Carbohydrate Polymers     Hybrid Journal   (Followers: 13)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 76)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 13)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 14)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 17)
Cereal Chemistry     Full-text available via subscription   (Followers: 6)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 11)
Chemical and Engineering News     Free   (Followers: 25)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 88)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 28)
Chemical Physics Letters : X     Open Access   (Followers: 4)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 25)
Chemical Reviews     Hybrid Journal   (Followers: 265)
Chemical Science     Open Access   (Followers: 44)
Chemical Science International Journal     Open Access   (Followers: 1)
Chemical Technology     Open Access   (Followers: 71)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 23)
ChemInform     Hybrid Journal   (Followers: 9)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 31)
Chemistry & Industry     Full-text available via subscription   (Followers: 8)
Chemistry - A European Journal     Hybrid Journal   (Followers: 224)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 20)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 24)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry Education Research and Practice     Free   (Followers: 8)
Chemistry Education Review     Open Access   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry Letters     Full-text available via subscription   (Followers: 49)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 336)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Full-text available via subscription   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 14)
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access   (Followers: 1)
ChemSystemsChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 13)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 5)
Ciencia     Open Access   (Followers: 1)
Clay Minerals     Hybrid Journal   (Followers: 9)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 12)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 24)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)

        1 2 3 4 | Last

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Al-Kimia : Jurnal Penelitian Sains Kimia
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2302-2736 - ISSN (Online) 2549-9335
Published by Universitas Islam Negeri Alauddin Makassar Homepage  [6 journals]
  • Perubahan Pola Kromatografi Lapis Tipis Ekstrak Daun dan Batang Teh
           (Camellia sinensis (L.) Kuntze) yang Menjadi Inang bagi 3 Benalu Berbeda

    • Authors: Irmanida Batubara, Lydia Octifani, Jarwadi Budi Hernowo
      Pages: 104 - 112
      Abstract: Plants produce primary and secondary metabolite compounds depending on their growth conditions. The tea plant (Camellia sinensis (L.) Kuntze that hosts Loranthus produces different metabolites compared to those not hosting. This study aims to determine the change in the thin layer chromatography pattern (TLC) of leaf and stem tea extract that is the host 3 types of Loranthus tea namely Loranthus atropurpureus, Loranthus cochinchinensis, and Loranthus pentandrus. Leaf and stem tea extracts that host 3 types of Loranthus were separated using TLC with stationary phase of silica gel 60 F254 and the mobile phase of DCM: MeOH: n-hex (48:1:1). Separation results was detected using UV lamps 254 and 366 nm. The changes of the band's area of each extract were determined using software ImageJ. The results showed a change in TLC patterns. The declining band's area was found in bands detected at 366 nm for the host's stem and tea leaves. The increasing band's areawere found on bands detected at 254 nm especially on tea leaves that host. In conclusion, the change in TLC pattern can be used to determine the compounds that change due to tea plants to host and can be alternative utilization.
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.14764
      Issue No: Vol. 8, No. 2 (2020)
  • Antituberculosis Activity Test of N-p-Methylbenzyl-p-coumaramide (MBC)
           Against M. tuberculosis H37Rv

    • Authors: Nasriadi Dali Wela, Arniah Dali Wela, Seniwati Dali, Hilda Ayu Melvi Amalia
      Pages: 113 - 121
      Abstract: An antituberculosis activity test of N-p-Methylbenzyl-p-coumaramide (MBC) against M. tuberculosis H37Rv has been carried out. The purpose of this study was to determine the antituberculosis activity of MBC against M. tuberculosis H37Rv. The study was conducted using agar diffusion method. The test solution was prepared by dissolving MBC in 20 mL Ogawa medium to a final concentration of 0.25; 0.50; 1; and 2 mg/L. PDA media that had been inoculated with M. tuberculosis H37Rv (seeded agar) were poured over the base layer on the petridish surface. Paper disks that have been immersed in the test solution were put symmetrically on the seeded agar. Furthermore, the seeds were incubated at 37 oC for 48 hours. Then the diameter of the inhibition zone was measured to the accuracy of 0.5 mm with a ruler. The results showed that MBC has biological activity as an antituberculosis. MBC can inhibit the growth of M. tuberculosis H37Rv at a concentration of 0.25; 0.50; 1; and 2 mg/L with a diameter of inhibitory zones respectively 8.9; 13.7; 18.5; and 21.3 mm. This showed that the inhibition of MBC on the growth of M. tuberculosis H37Rv increased with increasing concentration of MBC used.
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.10761
      Issue No: Vol. 8, No. 2 (2020)
  • Active Compounds Of Ethyl Acetate Extract Of Stylotella Sp. Sponges From
           Selayar Islands Against Mcf-7 Breast Cancer Cells

    • Authors: Asriani Ilyas, Sahyuni Hamzah, Firnanelty Firnanelty, Titik Andriani
      Pages: 122 - 128
      Abstract: Stylotella sp. sponge is a type of marine invertebrate animals that are widely distributed in Indonesian marine areas. One of the spreading areas of the Stylotella sp. sponge is in the Selayar Islands, South Sulawesi, Indonesia. Sponges have potential as a drug because they contain secondary metabolites. The aim study was to identify the types of secondary metabolite compounds and determine the bioactivity of Stylotella sp. compounds against MCF-7 breast cancer cells. The extraction method was used in the process of obtaining isolates because it is easy and economical. Testing the level of purity of isolates was carried out with three eluent systems which showed a single stain result. FTIR characterization results showed that pure isolates contained alkaloids which were characterized by the appearance of O-H, C-N, and C-H groups. The activity of MCF-7 cells using the colorimetric method showed an IC50 value of 14987.50 µg / mL, not toxic.
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.12840
      Issue No: Vol. 8, No. 2 (2020)
  • Aplikasi Tepung Cacing Tanah (Lumbricus rubellus) Untuk Meningkatkan Kadar
           Omega-3 Dan Omega-6 Ikan Bandeng (Chanos chanos) Budidaya Tambak

    • Authors: Ismail Marzuki, Irwan Paserangi, Muhammad Yusuf Ali
      Pages: 129 - 138
      Abstract: The quality of milkfish (Chanos chanos) in ponds cultivation is low. Small body size, pale body surface, odor of mud and low nutritional value cause not compete in the retail market, due to ponds experiencing burnout due to excessive use of synthetic fertilizers and pesticides. The aim of this study was improved the quality of milkfish farming with earthworm flour (Lumbricus rubellus) (TCT). Adding TCT to feed with four different treatments for 30 days. The results showed that the administration of 5%, 10% and 15% TCT, could improve the quality of milkfish ponds, both qualitative and quantitative. Qualitative improvement aspects, namely the surface of the fish's body was brighter, scales cleaner and whiter, the smell of mud was not felt, while the achievement of quantitative aspects was the fish's weight increased sharply in the range of 1.465% - 1.846% per day and omega-3 levels increased in the range of 1.9834 % - 5,5693% and omega-6 increased in the range of 1.4993% - 4.8796% or an increased of nearly 10 times each compared to levels of omega-3 and omega-6 milkfish samples without TCT
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.13807
      Issue No: Vol. 8, No. 2 (2020)
  • Dekolorisasi Malachite Green oleh Reagen Fenton: Optimalisasi Parameter
           dan Studi Kinetika

    • Authors: Said Ali Akbar
      Pages: 139 - 148
      Abstract: The study of the decolorization of Malachite Green in solution using the Fenton reagent has been investigated. The effects of different reaction parameters such as hydrogen peroxide concentration, iron ion concentration, pH of the solution, and initial dye concentration have been carried out. In this study the experimental range for H2O2 concentrations varied from 0.2 mM to 4 mM and Fe2+ ions were 0.01-0.1 mM. All experiments were carried out at room temperature of 27 oC. Furthermore, the optimal oxidation condition with the concentration of MG dyes of 20 mg/L was with H2O2 0.5 mM, Fe2+ 0.05 mM, and pH at 3. The dye decolorization process of MG was also observed kinetically, it was found that the degradation process took place with first-order reaction rate. Under optimal conditions, the dye solution with a concentration of 20 mg/L completely decolorized within 60 minutes at 27ºC, and 76% of the Chemical Oxygen Demand (COD) was removed. This proves that MG was not only decolorized but also mineralized.
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.13261
      Issue No: Vol. 8, No. 2 (2020)
  • Deasetilasi Kitin Cangkang Rajungan (Portunus pelagicus) Menjadi Kitosan
           Menggunakan Iradiasi Microwave

    • Authors: Robby Gus Mahardika, Muhammad Jumnahdi, Yekti Widyaningrum
      Pages: 149 - 158
      Abstract: The crab shell (Portunus pelagis) is still an untapped waste, especially on Bangka Island. Actually, this shell has a high value because there is chitin and chitosan. Chitosan is a biopolymer which has recently been developed into adsorbents, membranes and edible films. The deacetylation process of chitin will be the key to the quality of chitosan produced. Therefore, the purpose of this study is to see the effect of the chitin deacetylation process into chitosan using a microwave. Microwave deacetylation process is carried out with various time variations at 1200 W and 100oC. Characterization and degree of deacetylation (DD) of chitosan crab were analyzed by Fourier Transform Infrared (FTIR) spectroscopy. The results showed that deacetylation using conventional methods for 120 minutes at a temperature 100oC had DD 76.67% while deacetylation using microwave for 40 minutes at a temperature of 100oC had a DD  77.89%. Microwave deacetylation is three times faster than conventional methods.
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.7999
      Issue No: Vol. 8, No. 2 (2020)
  • Aplikasi Membran Filter Keramik Untuk Menurunkan Konsentrasi Zat Warna
           Remazol Red dan Nilai COD Limbah Cair Batik

    • Authors: Nur Fitriana, Maya Rahmayanti
      Pages: 159 - 167
      Abstract: Research on the application of ceramic filter membranes in reducing remazol red dye concentration and COD value of batik liquid waste has been carried out. The purpose of this study was to reduce the remazol red dye concentration and the COD value of batik wastewater using a ceramic filter membrane. The ceramic filter membrane used was made from clay and silica sand with variations in the number of additions of wood sawdust as much as 0, 1, 3, 5 and 7%. Then the porosity of the ceramic filter membrane was tested to determine the percentage of the pore volume that the ceramic filter membrane had. The ceramic filter membrane with the composition of clay, silica sand and 1% wood sawdust was the most optimum in reducing remazol red dye up to 86.68% and reducing COD value up to 97.87%. Keywords: filtration, remazol red, COD, ceramic filter membranes, batik liquid waste 
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.15932
      Issue No: Vol. 8, No. 2 (2020)
  • Determination of Ascorbic Acid Content using the Reverse Phase–High
           Performance Liquid Chromatography (RP-HPLC) Method

    • Authors: Nurul Ismillayli, Dhony Hermanto, I. G. A. Sri Andayani, Ruru Honiar, Ulul Khairi Zuryati, Baiq Mariana, Linda Marta Shofiyana
      Pages: 168 - 176
      Abstract: A method of reverse phase-high performance liquid chromatography (RP-HPLC) was evaluated in ascorbic acid determination. The determination was conducted at optimum conditions for RP-HPLC method, including ethanol as mobile phase, flow velocity of 0.8 mL/min, running time of 5 minutes, injection volume of 10 µL, UV detector, wavelength of 245 nm with internal standard of ascorbic acid in metaphosphate-acetic acid. Result of measurement was validated by AOAC Official Method 967.21. It was obtained that RP-HPLC method was high sensitive and precision method due to its limit of detection was 0,5 µg/mL and  RSD  was ≤ 2%. The results of the determination of vitamin C content in fresh ceruring fruit using RP-HPLC method and the titrimetry method namely, 52.9057 ± 0.17 and 54.2066 ± 0.87 mg in 100 g sample, respectively. Based on statistical analysis (t-test), there were no significant differences for the two methods used. The percentage of recovery obtained is excellent in the range of 97.9-104.3%. Therefore, the RP-HPLC method is expected to be an accurate method for routine analysis of vitamin C. Key word: ascorbic acid, reverse phase, HPLC, titrimetric. 
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.15097
      Issue No: Vol. 8, No. 2 (2020)
  • Kapasitas Adsorpsi Biomassa Paku Air (Lemna minor linn) Teresterifikasi
           Oleh Asam Sitrat Terhadap Mangan(Ii)

    • Authors: Anita Anita, Titin Anita Zaharah, Ajuk Sapar
      Pages: 177 - 188
      Abstract: Research on the adsorption of Mn (II) ions has been carried out using  biomass duckweed (Lemna minor linn) with the esterified by citric acid. This study aims to determine the maximum adsorption capacity of Mn (II) ions in using adsorbent biomass of duckweed esterified by citric acid. Water nail biomass adsorbents were characterized using FTIR to determine the functional groups of citric acid esterified adsorbents. The stages of this research include modification of water biomass using citric acid, followed by manganese (II) ion adsorption tests with pH variations in pH, contact time of adsorption and initial concentration variations under optimum conditions. The results showed that optimum adsorption occurred at pH  5, contact time for 10 minutes and the concentration of Mn (II) solution 15 mg / L was measured using atomic absorption spectrophotometry. The equation used in the study follows the Langmuir and Freundlich equations. Based on the Langmuir isotherm equation, the maximum adsorption capacity of Mn (II) ion using citric acid modified water nail biomass is  7,645 mg/ g, the equilibrium constant is 4,317 L/ mol and the adsorption energy is 36,84039 KJ / mol.
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.16144
      Issue No: Vol. 8, No. 2 (2020)
  • Aktivitas Antioksidan Kulit Pisang Muli (Musa acuminata linn) dan Kulit
           Pisang Kepok (Musa paradisiaca formatypica)

    • Authors: Putri Ade Rahma Yulis, Yelfira Sari
      Pages: 189 - 200
      Abstract: This study examined the content of banana peel. The research began with an extraction  process then continued with phytochemical tests.  Qualitatively result showed banana peel contain quite complex secondary metabolites including flavonoids, saponins, phenolics, tannins, steroids and triterpenoids for Muli banana peels and flavonoids, saponins, phenolics, tannins, and triterpenoids for Kepok banana peels. Qualitative tests were conducted to detect total phenolic and flavonoid content using Microplate Reader.  Flavonoids averaged 19.797 mg QE / g for  Muli banana peel and for Kepok banana peel 15, 529 mg QE / g. The measurement results of the total phenolic content  of Muli banana peel was 108.336 mg GAE / g and for Kepok banana 32, 496 mg GAE / g. Antioxidant activity for Muli banana peels has an IC50 value of 27, 56 µg / ml which means it belongs to a group with high antioxidant activity and Kepok banana 479.77 µg / ml which is classified as a low antioxidant activity but still within the range of potential values as antioxidant. From this research, it is known that both  of types banana peels have the potential as raw material for developing products with high antioxidant levels  Keywords: Banana peels, antioxidants, secondary metabolites
      PubDate: 2020-12-27
      DOI: 10.24252/al-kimia.v8i2.15543
      Issue No: Vol. 8, No. 2 (2020)
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