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All Journal Journal of Applied Chemical Science JMM (Jurnal Masyarakat Mandiri) Jurnal Fisika : Fisika Sains dan Aplikasinya BIO-EDU: Jurnal Pendidikan Biologi Jurnal Ilmiah Berkala Sains dan Terapan Kimia Chemistry Notes
Theodore Y. K. Lulan
Department Of Chemistry Faculty Of Science And Engineering, Nusa Cendana University
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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 1 
Purification and Characterization of Silica Rice Husk Ash (Oryza Sative L.) From Kupang Regency Lede, Mega O. L.; Wogo, Hermania Em; Lulan, Theodore Y. K.; Ledoh, Sherlly M. F.
Chemistry Notes Vol 3 No (1) (2021): Chem. Notes 2021, 3(1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v3i(1).4745

Abstract

This research had been done to purify and characterize silica from rice husk ash for two varieties of rice from Kupang Regency. The purification method used is the extraction method with alkaline solution (NaOH) and precipitation with acid solution (H2SO4). The stages in this research were preparation of rice husk ash, purification of silica rice husk ash with NaOH and H2SO4 solutions, and characterization covered: determination of acidity and surface area and determination of composition using X-ray fluorescence spectrophotometer (XRF). The results of the surface acidity test showed that the highest acidity was in Ciherang silica from Tarus, which was 2.288 mmol/g. While the surface area test showed that the largest surface area was Inpari 46 silica from Pariti, which was 184.297 m2/g with an optimum contact time of 50 minutes. The results of characterization using XRF exhibited that the highest silica purity was Ciherang rice variety from Tarus, with initial silica content data, purification with NaOH and H2SO4 were 93.9%; 98.2% and 99.1%. So that the purification process with NaOH and H2SO4 is proven to increase the silica content in the sample.
Bioaktivitas Metabolit Sekunder dari Genus Dipterocarpus Nalle, Halena A.; Lulan, Theodore Y. K.; de Rozari, Philiphi; Ola, Antonius R. B.
Chemistry Notes Vol 4 No (1) (2022): Chem. Notes 2022, 4 (1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v3i2.6078

Abstract

Research has been conducted with the title "Literature Study of Secondary Metabolites and Bioactivity of Plants Genus Dipterocarpus". The method used is a descriptive method with the aim of being to find out the active compounds in the genus plant dipterocarpus and to know the ability of the bioactivity of genus plants dipterocarpus. Based on the results of the study, bioactivity of secondary metabolites from planst of the genus dipterocarpus namely antidiabetic, antiplasmodial, antibacterial, antioxidant, anticlasses, cytotoxic, anticholinesterase, antiproliferation, anti-inflammatory and antimicrobial. Very strong biosaltivity indicated by the ethyl acetate faction plant D. Intricatus Sagai Antioxidant IC50 Nialial is 0.075 μg / mL. While very weak bioacchables are shown extract methanol stem plant D. Costatus as cytotoxic with ic50 value 973 ± 14.57 μg / mL.
Pengaruh Komposisi Daun Gamal (Gliricidia sepium Hbr.) dan Kotoran Sapi dengan Nutrisi Pisang terhadap Rasio C/N Kompos Sedo, Karolina M.; Tawa, Bibiana Dho; Lulan, Theodore Y. K.; Gauru, Imanuel; Cunha, Theodorus M. Da
Chemistry Notes Vol 3 No 2 (2021): Chem. Notes 2021, 3(2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v3i2.6089

Abstract

It has been done a research on the effect of the composition of gliricidia sepium Hbr. And cow dung with banana nutrition on the composting process on the C/N ratio. This research was conducted with the aim of knowing the effect of the composition and the length of time required for fermentation. Composting was made with a variety of cow dung : gliricidia sepium Hbr. In a ratio of 1:9, 1:1, 3:2, 7:3, 9:1, and 2:3 in % by using 25% banana nutrition and 100% water from the total weight of the manure. On this research was found that the optimal time is on 14th day with characteristic of compost that was produced, equal with the the Indonesia National Standar (SNI Kompos 19-7030-2004). The conclusion is the compcsition of cow dung and Gliricidia sepium leaves did not significant affect to the C/N compost ratio.
Analisis Kualitas Air pada Sumber Mata Air Di Desa Baumata Kecamatan Taebenu Kabupaten Kupang Kadang, Luther; Nua, Maria F.; Lulan, Theodore Y. Y. K.
Chemistry Notes Vol 4 No 2 (2022): Chem. Notes 2022, 4 (2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v4i2.9510

Abstract

Water quality is the nature of water and the content of living this, substances, energy, or other components in water as seen from physical, chemical, and biological characteristics. Pollution of the water environment often occurs, there by reducing water quality. The purpose of this study was to determine the quality and status of contamination of springs based on physical, chemical, and biological parameters in Baumata Village, Taebenu District, Kupang Regency based on the storet method. Determination of the location of water sampling is determined by the purposive sampling technique, while the water sampling refers to the Indonesian National Standard (SNI). Water quality measurements where carried out in situ and ex situ. Parameters tested in situ were temperature, tds, pH, odor and taste, while ex situ were hardness, detergent, and total coliform. The data from the analysis were compared with the quality standars according to Permenkes No. 32 of 2017. The results of the research on spring were reviewed from the parameters of temperature, tds, odor, taste, pH, hardness, and detergent showed that each value was still within safe limits except for parameters total coliform because it exceeds the required quality standars. The status of water contamination in springs based on the STORET method is lightly polluted.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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%.
PENENTUAN KANDUNGAN TOTAL FLAVONOID DAN FENOLAT EKSTRAK n-HEKSANA AKAR, BATANG, DAN DAUN TUMBUHAN Crotalaria Retusa L Santos, Adelina Dos; Lulan, Theodore Y.K.; Nitti, Fidelis
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.v6i2.18083

Abstract

Telah dilakukan penelitian dengan tujuan untuk mengetahui senyawa metabolit sekunder, kandungan total flavonoid dan kandungan total fenolat pada ekstrak n-heksana akar, batang, dan daun tumbuhan Crotalaria retusa L. Penelitian ini meliputi pengujian kualitatif dan kuantitatif. Hasil penelitian pada ekstrak n-heksana akar, batang, dan daun tumbuhan C. retusa mengandung golongan senyawa metabolit sekunder flavonoid dan fenolat. Kandungan total flavonoid pada ekstrak akar, batang, dan daun tumbuhan C. retusa secara berturut- turut yaitu; 105, 282 ± 0, 376; 13, 326 dan 97,021 ± 0,100 mg QE/g, dan kandungan total fenolat akar, batang dan daun secara berturut-turut yaitu; 220,69 ± 0,464; 152,239 ± 0,066 dan 107, 309 ± 0,066 mg GAE/g
UJI TOKSISITAS EKSTRAK AIR DAUN KELOR (Moringan oleifera, L) ASAL LAHAN KERING NUSA TENGGARA TIMUR da Cunha, Theo; Darmakusuma, Dodi; Ola, Antonius R.B.; Lulan, Theodore Y.K.
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.v7i1.22611

Abstract

Tumbuhan Kelor (Moringa oleifera Lamk) banyak tumbuh di Nusa Tenggara Timur (NTT) yang beriklim Lahan Kering. Daun Kelor banyak digunakan masyarakat NTT sebagai bahan makanan. Daun kelor mempunyai kandungan gizi yang tersebar mulai dari buah, sampai akarnya. Selain itu kelor mempunyai manfaat lain seperti koagulan, vitamin dan sebagai obat. Penelitian ini mempelajari efek toksik ekstrak air daun kelor terhadap larva udang Artemia Salina Leach dengan menggunakan metode BST. Metode ini sebagai pengujian awal dari efek anti bakteri dan anti kanker, penggunakan air (suhu kamar) sebagai pelarut agar dapat diaplikasikan secara langsung oleh masyarakat. Daun kelor dimaserasi selama 3 x 24 jam menggunakan air, hasil uji fitokimia teridentifikasi kandungan metabolic sekunder antara lain, Alkaloid, Flavonoid, Triterpen, dan Tanin. Hasil uji BSLT menunjukan bahwa ekstrak air (suhu kamar) daun kelor mempunyai tingkat toksisitas terhaap Artemia Salina Leach yang ditunjukan dengan nilai LC50 888, 34 kurang dari 1000 ppm. Dapat disimpulkan bahwa daun kelor mempunyai potensi sebagai tanaman yang nantinya dapat dimanfaatkan sebagai anti bakteri dan anti kanker.
PENENTUAN KANDUNGAN FENOLAT DAN AKTIVITAS ANTIOKSIDAN FRAKSI DIKLOROMETANA EKSTRAK KULIT BATANG TUMBUHAN Sterculia foetida L. Lulan, Theodore Y. K.; Asanab, Fitriani; Gauru, Imanuel; Rozari, Philipi D.
Chemistry Notes Vol 7 No 2 (2025): Chem. Notes, 7(2), 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v7i2.26455

Abstract

Sterculia foetida L. diketahui memiliki kandungan senyawa fenolat yang berpotensi sebagai sumber bahan baku obat dan sebagai agen antioksidan alami. Penelitian ini bertujuan untuk mengetahui total kandungan fenolat tumbuhan S. foetida serta mengetahui kemampuan aktivitas antioksidan fraksi diklorometana tumbuhan S. foetida. Total kandungan fenolat ditentukan dengan metode Follin- Ciocalteu. Pengujian aktivitas antioksidan S. foetida dilakukan secara kuantitatif menggunakan metode 1,1-difenil-2- pikrilhidrazil (DPPH). Prinsip dari metode ini adalah penurunan intensitas warna atau absorbansi larutan DPPH yang sebanding dengan kenaikan konsentrasi senyawa antioksidan. Hasilnya dinyatakan dengan nilai Inhibition Concentration 50 (IC50) yang menunjukkan konsentrasi suatu senyawa antioksidan yang mampu menangkal 50% radikal DPPH. Hasil penelitian menunjukan bahwa total kandungan fenolat sebesar 87.76 ± 0.85 mg GAE/g dan fraksi diklorometana ekstrak kulit batang tumbuhan S. foetida memiliki aktivitas antioksidan yang kuat dengan nilai IC50 sebesar 45.4521µg/mL.
Co-Authors Antonius R.B. Ola Asanab, Fitriani Bibiana D. Tawa Cunha, Theodorus M. Da Da Cunha, Theo Desiana Sanang Dodi Darmakusuma, Dodi Fidelis Nitti Gauru, Imanuel Hermania Em Wogo Kadang, Luther Lanamana, Willybrordus Laurentius Dominicus Gadi Djou Lede, Mega O. L. Ledoh, Sherlly M. F. Luther Kadang Murdaningsih Nalle, Halena A. Ndolu, Intan C. M. Novita Santalia Nika Nua, Maria F. Philiphi de Rozari Reinner Ishaq Lerrick Rozari, Philipi D. Santos, Adelina Dos Sedo, Karolina M. Sefrinus Maria Dolfi Kolo Siburian, Rikson A.F Theo Da Cunha Yakoba Tari Yohanes Buang