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All Journal Journal of Applied Chemical Science Indonesian Journal of Chemistry Jurnal Saintek Lahan Kering Molekul: Jurnal Ilmiah Kimia Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Chemistry Notes
Hermania Em Wogo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Energy Environmental Science Public Health

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Journal : Chemistry Notes

 1 
SYNTHESIS AND CHARACTERIZATION OF CHITOSAN-MAGNESIUM (II) COMPLEX IONS FROM SHRIMP SHELLS BILAUT, IDALIA; Gauru, Imanuel; Wogo, Hermania Em; Lapailaka, Titus
Chemistry Notes Vol 1 No 1 (2019): Chem. Notes 2019, 1(1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v1i1.1574

Abstract

Research has been carried out on the synthesis and characterization of Mg - Chitosan complex ions from shrimp shells using crosslink method. Chitosan isolation was made in four stages, namely deproteination, demineralization, depigmentation and deacetylation. The maximum degree of deacetylation (DD) of chitosan is 89%. Based on XRD and FTIR data, chitosan obtained is in the form of amorphous and there are typical wave number of chitosan, namely 3444.91 cm-1 and 1658.4 cm-1 associated to O-H, N-H dan C=O.
ANTIBACTERIAL AND BIODEGRADATION NATURE TEST OF EDTA-Ag IMMOBILIZED SILICA COMPOZITE PLASTICS AND CHITOSAN Wogo, Hermania Em; Ndoen, Martha C. W.; Ola, Pius Dore
Chemistry Notes Vol 1 No 2 (2019): Chem. Notes 2019, 1(2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v1i2.1687

Abstract

It has been conducted a research, which it aims to know the antibacterial and biodegradation nature of EDTA-Ag and chitosan immobilized silica composite plastics. Silica used was from rice hull processing products. Chitoson used was 0.3 and 0.7 g. Antibacterial assay was conducted over Staphylococcus aureusandEscherichia coli bacteria. the result obtained showed that the biggest inhibitory is at variation of chitosan 0.7 g, which over Staphylococcus aureusbacteria is 15.6 mm and Escherichia colibacteria is 16,7 mm. While, in biodegradation assay, the highest degradation percentage is at chitosan variation 0.3 g, namely 32.17%.
Analysis of Timor’s Hyptis suaveolens L Poit Leaves Mali, Ferdianus; Wogo, Hermania Em; Lerrick, Reinner Ishaq
Chemistry Notes Vol 2 No 1 (2020): Chem. Notes 2020, 2(1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v2i1.2341

Abstract

Analysis of essential oil contained in Timor Hyptis suaveolens L Poit leaves has been done over GC-MS spectrometer. By distilling of the pre-dried leave samples using Stahl apparatus, there was 0,134% colored yellow and typical oil yielded. The GC-MS detected 33 compounds mainly 16,47% of trans-caryophillene, 16,09% of 1,8-cineole, 8,32% of caryophyllene oxide, 6,67% of 3 cyclohexene-1ol,4-methyl-1-1 and 2,7,6,24% of 11-cyclotetradecatrien-1-ol. Moreover phenol-2-methoxy trans-caryopillene, a-gurjunne, phenol-2,4-bis, 1-hexadecene, a-cedrol and cembrene have been found as new chemotype in comparison to 10 suoveolens from different countries, planting condition and/or climates.
PEMANFAATAN ABU LAYANG (FLY ASH) SEBAGAI ADSORBEN PADA MINYAK JELANTAH Wogo, Hermania Em; Bokay, Ernawati A.; Tawa, Bibiana D.; Ledoh, Sherlly M. F.
Chemistry Notes Vol 2 No 2 (2020): Chem. Notes 2020, 2(2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v2i2.3279

Abstract

A research on the conducted on the use of fly ash as an adsorbent in used cooking oil. This research was conducted with the aim to know the characteristics of fly ash without activation and activation with 6M HCl and to improve the quality of used cooking oil from adsorbent processing based on the Indonesian national standard (SNI). This research was conducted in several stages, namely surface acidity with the titration method, determination of surface area with the blue methylene method, determination of functional groups by FTIR analysis and oil quality based on parameters of acid number, peroxide number and smoke point. The results showed that the acidity of the surface of the fly ash was activated and without activation of 4 and 3.6 m2 / g respectively. surface area of ​​fly ash without activation 17,480 m2/g at contact time 80 and activated fly ash 18,471 m2/g at contact time 70. FTIR spectra of fly ash without activation 795,38 and 779.95 cm-1 and activated 795.38 and 778,02 cm-1 which is a symmetrical stretching adsorption band of symmetric ≡Si-O (≡Si-O-Si≡). Fly ash used for refining used cooking oil (2,468 mg KOH / g) is able to reduce the acid number 0.361 mg KOH / g in activated fly ash and 0.561 mg KOH / g for fly ash without activation, the peroxide number for activated fly ash decreased by 72.34% compared to fly ash without activation 69.14%, oil smoke point purification results from activated fly ash 203ºC and without activation 210ºC which is close to the new oil smoke point value of 200ºC. When compared with SNI, the values ​​of acid numbers, peroxide numbers and smoke points meet the standard.
Spectrophotometrically Determination of Fe(III) in Manganese Processing Waste Water with Ethanol Extract of Terminalia catappa L. Leaves as a Complexing Agent Ola, Pius D.; Beti, Milce Y.; Wogo, Hermania Em; Darmakusuma, Dodi
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).4711

Abstract

Chemical analysis, including metal ions determination using the spectrophotometry method, involves using a complexing agent, mostly produced by chemical industries, reacting with the analyte to form a colored compound. The very high cost and the environmentally unfriendly are the main disadvantages of that complexing agent. The use of a complexing agent categorized as a “green” chemical is critical to overcoming those shortcomings. In this work, extract ethanol of Terminalia catappa L. leaves was employed as a complexing agent in the determination of Fe(III) from aqueous media using the spectrophotometry method. The value of correlation coefficient (r) 0.993, obtained from the calibration curve, indicated that ethanol extract of Terminalia catappa L. leaves could be applied as a complexing agent for determining Fe(III) from aqueous media using the spectrophotometry method. By comparing this complexing agent with the commonly used complexing agent of Fe(III) viz KSCN, it was found that these two complexing agents did not differ significantly in the term of precision. Unlike precision, the accuracy obtained from these two complexing agents still differs significantly. When both complexing agents were applied in the determination of Fe(III) in manganese processing waste water, we found the concentration of Fe(III) was 0.009 ppm (ethanol extract as complexing agent) and 0.0076 ppm (KSCN as complexing agent). It is recommended to purify the extract before using it as a complexing agent for Fe(III) determination.
Sintesis Etil Stearat dari Reaksi Esterifikasi Asam Stearat dan Etanol Menggunakan Katalis Asam Sulfat Nitbani, Febri O.; Sabu, Marselina; Wogo, Hermania Em; Cunha, Theo Da
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).4744

Abstract

The study about Synthesis of Ethyl Stearate through Esterification Reaction of Stearic Acid and Ethanol Using Sulfuric Acid Catalysis had carried out. The purpose of this study is to know how to synthesize Ethyl Stearate from esterification reaction of stearic acid and ethanol using sulfuric acid catalyst. Characterization of Ethyl Stearate compound was done using FT-IR and GC-MS. The study result exhibits that the yield of Ethyl Stearate product obtained is 98.85 %. Through characterization using FT-IR and GC-MS can be concluded that Ethyl Stearate compound is successfully synthesized and its purity reaches 98.87%.
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.
Co-Authors Agnes Simamora Antonius R.B. Ola Beti, Milce Y. Bibiana D. Tawa BILAUT, IDALIA Bokay, Ernawati A. Chong Dat Pham Cunha, Theo Da Dodi Darmakusuma Dodi Darmakusuma, Dodi Gauru, Imanuel Janrigo K Mere Juliana Ofi Segu Julinda Bendalina Dengga Henuk Lapailaka, Titus Lede, Mega O. L. Ledoh, Sherlly M. F. Lerrick, Reinner Ishaq Lince Mukkun Lulan, Theodore Y. K. Luther Kadang Magdalena A. Mir Mali, Ferdianus Martha C.W Ndoen Mersiana Bria Mosa Ndoen, Martha C. W. Nitbani, Febri O. Ola, Pius D. Peter Proksch Pius Dore Ola Pius Dore Ola Putra J.P Tjipta Sabu, Marselina Sherlly Ledoh Siti Arianti S.A Suwari Tjitda, Putra Jiwamurwa Pama Windy Taebenu Yoseph J. Hema