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Chemistry Notes
Published by Universitas Nusa Cendana
ISSN : 26221071     EISSN : -     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science
This journal publishes reserach(es) in the field organic, inorganic, biochemistry, physical and analytical chemistry, applied chemistry including materials, medicines and agricaltural based chemistry applications and educational chemistry. This bilingual journal (in English or in Bahasa Indonesia) is issued in 2 (two) volumes (July and December) every year.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 66 Documents
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PREPARATION OF ACTIVATED CHARCOAL FROM Terminalia catappa L. SEED SHELL AS AN ADSORBENT OF LIQUID WASTE OF TOFU INDUSTRY Ola, Pius D.; Bria, Apriance M.; Gauru, Imanuel; Rozari, Philiphi De
Chemistry Notes Vol 5 No 1 (2023): Chem Notes 2023, 5(1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v5i1.11851

Abstract

A research on preparing activated charcoal from Terminalia catappa L. seed shell has been done. This study aimed to determine the characteristics of activated charcoal from Terminalia catappa L.seed shells and test its ability to reduce COD and TSS from a liquid waste of the tofu industry. The parameters studied in characterizing activated charcoal included moisture content, ash content, absorption of I2 and surface area using methylene blue. Analysis of the COD parameter used the redox titration method, while the TSS parameter used the gravimetric method. he optimum time for applying activated charcoal to liquid tofu waste was by measuring COD and TSS levels after interaction with activated charcoal. Results of activated charcoal characterization showed a moisture content of 5%, ash content of 2.10%, an absorption capacity of I2 761.4 mg/g and a surface area of ​​26.74 m²/g. The highest decrease in COD levels occurred at 90 minutes of contact time from initial levels of 2,976 mg/L to 2,304 mg/L, with a reduction efficiency of 22.6%, and the highest decrease in TSS levels occurred at 90 minutes of contact time from initial levels of 1,440 mg/L to 334 mg/L, with a reduction efficiency of 76.8%. Generally, activated charcoal from Terminalia catappa L. seed shells showed an ability to reduce the COD and TSS from the liquid waste of the tofu industry.
PENETAPAN KADAR TANIN DAN UJI KEMAMPUAN EKSTRAK DAUN GAMAL (Gliricidia sepium) SEBAGAI INHIBITOR KOROSI LOGAM TEMBAGA (Cu) Lapailaka, Titus; Edamuli, Tri O. N.; Kadang, Luther
Chemistry Notes Vol 5 No 1 (2023): Chem Notes 2023, 5(1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v5i1.11853

Abstract

A study has been carried out to determine the levels of tannins and the effectiveness of Gamal leaf extract (Gliricidia sepium) as a corrosion inhibitor for copper (Cu). The objectives of this research were to determine the tannin content in gamal leaf extract, observe the corrosion rate of copper with varying concentrations of the extract, identify the optimal soaking time, and evaluate the inhibitory properties of gamal leaf extract on copper corrosion. Gamal leaf extract was obtained through maceration and confirmed to contain tannins using phytochemical tests. The corrosion rate and inhibition efficiency were measured using the weight loss method. The results indicated that the gamal leaf extract contained 40.42% tannins. A concentration of 10% of gamal leaf extract reduced the corrosion rate of copper in a NaCl solution, demonstrating the highest inhibition efficiency at 80.16%. It was observed that increasing the concentration of the inhibitor and prolonging the immersion time led to lower corrosion rates. In the case of a NaCl solution as the corrosion medium, the highest concentration of gamal leaf extract used was 10%, and the longest immersion time was 9 days, resulting in a corrosion rate of 0.0593 cm/year.
Pemanfaatan Silika Gel Hasil Pengolahan Abu Tongkol Jagung Termodifikasi TiO2 untuk Mengurangi Kadar Nitrat dalam Limbah Cair Tahu Lulan, Theodore Y. K.; Ndolu, Intan C. M.; Nitti, Fidelis
Chemistry Notes Vol 5 No 2 (2023): Chem Notes, 5(2), 2023
Publisher : Universitas Nusa Cendana

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Abstract

Research has been conducted with the title Utilization of Silica Gel from the processing of TiO2-Modified Corn Cob Ash to Reduce Nitrate Levels in Tofu Liquid Waste. This study aims to determine the characteristics of silica gel from the processing of TiO2-modified corn cob ash in terms of functional groups and crystallinity and to determine the effectiveness of TiO2-modified silica gel to reduce nitrate levels in tofu liquid waste using pH, time and concentration parameters. The synthesis of silica gel from corn cob ash was carried out using the sol gel method. The results of FTIR characterization showed the successful synthesis of silica gel and TiO2 modified silica gel indicated by the presence of Si-O-Si and Si-OH absorption in silica gel and Ti-O-Ti absorption in TiO2 modified silica gel. The XRD data shows that silica gel has an amorphous structure and modified silica gel has an anatase structure. The results showed that the largest nitrate reduction occurred at pH 5 by 98.69%, contact time of 60 minutes by 97.39% and optimum concentration of 200 ppm by 98.94% with the largest silica adsorption capacity of 245.94 mg/g and the percentage of nitrate reduction in tofu liquid waste by 99.94%.
Toxicity Assay of 2,4,5-Trimethoxybenzaldehyde Using Brine Shrimp Lethality Test (BSLT) Lerrick, Reinner I.; Ximenes, Paskalia A.; Suwari, Suwari
Chemistry Notes Vol 5 No 2 (2023): Chem Notes, 5(2), 2023
Publisher : Universitas Nusa Cendana

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Abstract

Aromatic aldehydes including chalcones are known to have various biological activities. Such compound i.e. 2,4,5-trimethoxybenzaldehyde has also proven to be a COX-II inhibitor anti-inflammation and colon and breast cancer chemoprotective agent. This study aims to determine the toxicity of 2,4,5-trimethoxybenzaldehyde against artemia salina L. larvae according to the Brine Shrimp Lethality Test (BSLT) method. The results showed that the 2,4,5-trimethoxybenzaldehyde has a toxic effect with its LC50 is 70.12 µg/mL
STUDY OF KOJIC ACID PRODUCTION IN ENDOPHYTIC FUNGI AND APPLICATION IN DECAY PREVENTION TOMATO (Lycopersicum Esculentum L.) Ola, Antonius R.B.; Kadang, Luther; Bagung, Dionisius Yosama
Chemistry Notes Vol 6 No 1 (2024): Chem. Notes, 6(1), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i1.15270

Abstract

A study of kojic acid production in the endophytic fungi Aspergillus flavus was conducted to identify the effect of kojic acid on efforts to prevent decay and manage the quality of shelf life of tomato fruit (Lycopersicum esculentum L.). The kojic acid obtained showed good results in preventing tomato fruit spoilage. The organoleptic test results on the texture and aroma of tomato rot stated the highest favorability in the test treatment with kojic acid, namely in the treatment of tomato fruit stored by spraying 1% kojic acid. The ability of kojic acid to extend the shelf life of tomato fruit is seen from its antibacterial activity and is able to suppress the rate of respiration and transpiration in tomato fruit.
PEMANFAATAN ARANG BUNGA LONTAR (Borassus flabeliffer Linn.) SEBAGAI BIOADSORBEN PADA LIMBAH TENUN IKAT Kadang, Luther; Lerrick, Reinner I; Rika, Maria Aurelina
Chemistry Notes Vol 6 No 1 (2024): Chem. Notes, 6(1), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i1.15476

Abstract

Penelitian pemanfaatan arang bunga lontar sebagai bioadsorben untuk adsorpsi warna dari limbah cair tenun ikat dan penentuan beberapa parameter limbah cair tenun ikat telah dilakukan. Arang terlebih dahulu dikarakterisasi untuk mengetahui kadar air, kadar abu dan luas permukaan bioadsorben menggunakan metilen biru secara spektrofotometri. Penelitian kemudian dilanjutkan dengan penentuan kondisi optimum adsorpsi yang meliputi massa bioadsorben dan waktu kontak. Kondisi optimum yang diperoleh kemudian diaplikasikan untuk adsorpsi warna dari limbah cair tenun ikat dan penentuan beberapa parameter limbah cair tenun ikat yang meliputi TSS, COD, dan pH. Hasil karakterisasi arang menunjukkan kadar air sebesar 4,92%, kadar abu 8,63% dan luas permukaan 62,895 m2/gram. Waktu kontak optimum pada proses penyerapan pada menit ke 60 sebesar 0,0659 mg/g dan massa bioadsorben optimum 2 gram menunjukkan dalam 20 mL limbah cair. Hasil pengaplikasian kondisi optimum menunjukkan efisiensi penurunan kadar arang dalam limbah cair tenun ikat sebesar 42,4 mg/g dan penurunan kadar TSS sebesar 69%, COD 39% dan nilai pH mengalami perubahan dari 11,13 menjadi 8,30. Hal ini menunjukkan bahwa arang bunga lontar sebagai bioadsorben mampu menurunkan intensitas warna pada limbah cair tenun ikat berdasarkan ketiga parameter tersebut.
PENENTUAN KANDUNGAN FLAVONOID DAN UJI AKTIVITAS ANTIOKSIDAN FRAKSI ETIL ASETAT EKSTRAK KULIT BATANG Sterculia foetida L. DENGAN METODE 2,2-azino-bis(3-ethyl benzothiazoline-6-sulfonic acid) (ABTS) Soi, Maria Yuliana; Lulan, Theo Y.K.; Nitti, Fidelis
Chemistry Notes Vol 7 No 1 (2025): Chem. Notes, 7(1), 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v7i1.16260

Abstract

Penelitian ini telah dilakukan dengan tujuan untuk menentukan golongan senyawa yang terdapat dalam ekstrak metanol kulit batang Sterculia foetida L. serta total kandungan flavonoid dalam fraksi etil asetat ekstrak metanol kulit batang Sterculia foetida L. dengan metode spektrofotometri UV-Vis dan aktivitas antioksidan dengan metode 2,2-azino-bis(3-ethyl benzothia zoline-6-sulfonic acid) (ABTS). Hasil penelitian menunjukkan bahwa adanya kandungan triterpenoid/steroid, flavonoid dan tanin dalam ekstrak metanol S. foetida. Kandungan flavonoid total pada fraksi etil asetat ekstrak S. foetida sebesar 10,99 1,56 mg QE/g ekstrak, sedangkan untuk uji aktivtas antioksidan dari fraksi etil asetat sebesar 51,571% dengan bilai IC50 sebesar 92,04 ppm.
SINTESIS DAN UJI AKTIVITAS ANTIBAKTERI FATTY ACID METHYL ESTER (FAME) DARI MINYAK BIJI KEMIRI (Aleurites Moluccana L.) Nitbani, Febri O.; Ola, Antonius R.B.; De Carvalho, Filomena Gizela
Chemistry Notes Vol 6 No 2 (2024): Chem. Notes, 6(2), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i2.16441

Abstract

Minyak biji kemiri merupakan salah satu minyak nabati yang dihasilkan dari biji kemiri melalui proses ekstraksi soxhlet. Minyak biji kemiri dapat disintesis menjadi FAME karena mengandung komposisi asam lemak yang tinggi dengan catatan dilalukan proses penetralan sebelum disintesis menjadi FAME. Tujuan penelitian ini untuk mengetahui rendemen minyak biji kemiri dengan menggunakan metode ekstraksi soxhlet, mengetahui % rendemen FAME hasil sintesis melalui proses transesterifikasi setelah penetralan minyak dan uji sifat antibakteri FAME dari minyak biji kemiri terhadap bakteri Staphylococcus aureus dan Escherichia coli. Hasil penelitian memperoleh rendemen minyak sebesar 80,2%, rendemen FAME sebesar 68,4% dan sifat antibakteri FAME minyak biji kenari yang diuji menunjukan daya hambat terbesar terdapat pada bakteri S. aureus dengan diameter hambat sebesar 14,3 mm pada konsentrasi 20% sedangkan daya hambat FAME terhadap bakteri E. coli dengan diameter hambat sebesar 13,1 mm pada konsentrasi 20%.
PENURUNAN KADAR AMMONIA PADA LIMBAH SALON KECANTIKAN MENGGUNAKAN METODE ELEKTROKOAGULASI DENGAN ELEKTRODA Fe Ledoh, Sherly M.F; Kadang, Luther; Hasman, Masita
Chemistry Notes Vol 7 No 1 (2025): Chem. Notes, 7(1), 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v7i1.16686

Abstract

Telah dilakukan penelitian dengan judul Penurunan kadar Ammonia pada limbah salon kecantikan menggunakan metode elektrokoagulasi dengan elektroda Fe. Penelitian ini bertujuan untuk mengetahui pengaruh tegangan listrik dan variasi waktu serta mengetahui kadar ammonia pada limbah salon kecantikan menggunakan metode elektrokoagulasi dengan elektroda besi. Kondisi optimum elektrokoagulasi adalah pada waktu kontak 150 menit dengan persentase elektrokoagulasi ammonia pada limbah cair salon kecantikan adalah 60,06%, serta kondisi optimum tegangan pada 15 volt dengan persentase elektrokoagulasi ammonia adalah 63,97%
ANALISIS KOMPONEN KIMIA DAN AKTIVITAS ANTIOKSIDAN LIMBAH AIR PENYULINGAN MINYAK CENDANA Darmakusuma, Dodi; sukur, sutra; Ola, Antonius R.B.
Chemistry Notes Vol 6 No 2 (2024): Chem. Notes, 6(2), 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v6i2.16714

Abstract

ABSTRAK ANALISIS KOMPONEN KIMIA DAN AKTIVITAS ANTIOKSIDAN LIMBAH AIR PENYULINGAN MINYAK CENDANA Sutra Sukur, Dodi Darmakusuma*, Antonius R. B. Ola** Telah dilakukan penelitian dengan judul “Analisis Komponen Kimia Dan Aktivitas Antioksidan Limbah Air Penyulingan Minyak Cendana”. Penelitian ini bertujuan untuk mengetahui komponen kimia yang terkandung dalam limbah air penyulingan minyak cendana (Santalum album L.). Penelitian ini juga bertujuan unuk mengetahui aktivitas antioksidan yang terdapat pada limbah air penyulingan minyak cendana (Santalum album L.). Penelitian ini dilaksanakan mulai dari persiapan sampel, penyulingan, pengeringan dan ekstraksi. Kemudian dianalisis aktivitas antioksidan dan komponen kimia menggunakan metode analisis DPPH dan HPLC. Hasil penelitian menunjukkan bahwa masih terkandung komponen kimia dalam limbah air penyulingan minyak cendana dengan presentase sebesar 24,48%, 11,89% dan 9,51%. Selanjutnya aktivitas antioksidan pada limbah air penyulingan minyak cendana termasuk dalam kategori sangat lemah dengan nilai IC50 sebesar 244,19 ppm.

Page 5 of 7 | Total Record : 66

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