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Dina Kartika Maharani
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Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231
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Unesa Journal of Chemistry
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Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 22528180     DOI : https://doi.org/10.26740/ujc.v11n2
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
UNESA Journal of Chemistry is online Journal covering all aspects of Chemistry. The journal publishes original research paper and review articles.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 103 Documents
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Sintesis dan Karakterisasi Urea Slow Release Fertilizer (SRF) dengan Matriks Kitosan Termodifikasi PVA/CaCO3 Yasfin Shafa Nurulisia; Sari Edi Cahyaningrum
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n1.p8-14

Abstract

Urea fertilizer is widely used in the agricultural due to its high content of nitrogen (±46%). However, only 30-40% of nitrogen that is effectively absorbed by plants, while the remainder is lost to the environment. Therefore, the development of SRF offers a potential solution to improve the efficiency utilization of urea fertilizer. In this study, urea based SRF was successfully synthesized using the casting method which is the urea with concentration of 0, 1000, 2000 and 3000 ppm was coated with chitosan which modified by PVA/CaCO3. In addition to synthesis, the urea SRF was also characterized through swelling and porosity test showed that the higher the concentration of urea that added, the lower of swelling degree and %porosity of the urea SRF. Meanwhile, the result of the urea release test indicated that when the urea concentration increased led to a higher urea release rate, resulting in a greater percentage of urea release.
PENGARUH PVA PADA PEMBUATAN PUPUK UREA SLOW RELEASE FERTILIZER PADA MATRIKS KITOSAN TERMODIFIKASI Marena, Betari; Cahyaningrum, Sari Edi
Unesa Journal of Chemistry Vol. 13 No. 3 (2024): Vol 13 No 3 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v13n3.p83-88

Abstract

Slow Release Fertilizer can be made with organic or inorganic materials. Several materials have been compared in their properties to produce SRF membranes that have the most suitable properties to be made as SRF. In this study, SRF was made with chitosan-PVA-Urea-Ca materials with the aim of increasing the efficiency of urea fertilizer absorption by plants. The method used in making this SRF is the casting method, the membrane solution will be spread on a surface and the solvent will be evaporated so that a dry SRF membrane can be produced. The results of the study showed that the more PVA added, the degree of swelling can be increased, its elasticity can be increased, and its porosity can be reduced so that it can increase the efficiency of urea absorption by plants
Identification Identification of Functional Groups in Sludge 120C of Ammonia IB Factory PT Petrokimia Gresik by ATR-FTIR Method Cholillah, Vidya Nur
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n1.p15-19

Abstract

The ammonia production process uses natural gas and nitrogen as raw materials with the main product being ammonia and by-product CO2. CO2 in the ammonia production process must be removed by absorption using a benfield solution and converting CO2 to CH4. Unit 144D of PT Petrokimia Gresik IB ammonia plant is poisoned by CO2 gas from the LTS (Low Temperature Shift) unit. The indication is based on the formation of deposits in the 120C cone strainer unit and it is suspected that the deposits are ammonium carbamate or ammonium carbonate. Identification was carried out using the ATR-FTIR method by comparing the sample with standard ammonium carbamate as well as with the IR spectra of ammonium carbonate and ammonium bicarbonate from the literature. The results showed that the similarity of the sample with ammonium carbamate was 87.6%. There are peaks at wave numbers 3500-3300 cm-1 showing N-H vibrations of primary amines, 1600-1700 cm-1 which shows C=O stretching vibrations. Then at 1490-1410 cm-1 which shows the presence of carbonate ions (CO32-). The wave number between 1450-1400 cm-1 shows the vibration of NH4+ ions. It is likely that the compound formed is a mixture of ammonium carbamate and ammonium carbonate because testing was not carried out to obtain the percentage of similarity of ammonium carbonate with the sample directly.
PEMANFAATAN SARI KULIT PISANG KEPOK (Musa paradisiaca L.) SEBAGAI MINUMAN FERMENTASI MENGGUNAKAN Lactobacillus plantarum B1765 Annisa Suci Hermansyah; Wikandari, Prima Retno
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n1.p20-27

Abstract

Kepok banana peel is an agricultural waste that has not been optimally utilised. Efforts are needed to utilise the waste that provides added value as a food product. Fermented beverage is one of the products that can be developed based on the nutritional potential of kepok banana peel. This study was conducted to determine the effect of variation in fermentation duration on product quality including microbiological quality (Total Lactic Acid Bacteria (LAB)), chemical quality (pH and Total Titratable Acid (TAT)) and organoleptic quality (Colour, Taste and Aroma) in kepok banana peel fermented beverage using Lactobacillus plantarum B1765. Fermentation was carried out for 0, 6, 12, 18, 24 and 30 hours at 37°C. Total LAB was calculated using the Total Plate Count (TPC) method, pH was determined using a pH meter, and TAT was tested using the acid-base titration method. Meanwhile, organoleptic was tested using the panellist's favourite level quality test. The results showed that the fermentation time reached the highest LAB growth up to 2.23 x 108 CFU/mL at 12 hours fermentation. pH decreased from 6.07 to 3.82 and TAT increased from 0.14% to 0.7% at 30 hours fermentation. Meanwhile, the level of panellists' liking reached an optimum at 24 hours with the category of liking. According to SNI 7552:2018 from the aspects of total LAB, TAT, and organoleptic, the best fermentation time is 24 hours.
SENYAWA METABOLIT SEKUNDER DAN AKTIVITAS ANTIBAKTERI TERHADAP EKSTRAK DAUN PORANG DALAM PELARUT EKSTRAKSI YANG BERBEDA I Putu Gede Adi Purwa Hita; Padmidewi Wijaya Kusuma; I Nyoman Arya Purnata Megantara; I Gusti Ngurah Agung Windra Wartana Putra; Ni Wayan Windia Indayanti
Unesa Journal of Chemistry Vol. 14 No. 3 (2025): Vol 14 No 3 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n3.p70-76

Abstract

The common bacteria that causes diarrhea is Escherichia coli. Therapy for Escherichia coli bacterial infection uses  antibiotics but the use  of  antibiotics that  are relatively high can  cause resistance, so alternative medicines are needed using herbal medicinal plants. Based on the studies, one of the plants that can be used as an antibacterial is the porang plant (Amorphophallus muelleri Blume) which is a type of plant that has potential both technologically and commercially in terms of medical, industrial and food. This study aims to determine the content of secondary metabolites and antibacterial activity contained in porang leaf extract (Amorphophallus muelleri Blume) with 96% ethanol, ethyl acetate and n-hexane as solvents. In the antibacterial activity test using the disc diffusion method with NA media (Nutrient Agar), ciprofloxacin as a positive control, 10% DMSO as a negative control and various concentrations of 15%, 30%, 45%, and 60%. The three porang leaf extracts can produce the greatest antibacterial activity at a concentration of 60%. Antibacterial activity in the ethanol extract of porang leaves had an average inhibition zone of 1.32 ± 0.59 mm, in the ethyl acetate extract of porang leaves it had an average inhibition zone of 0.73 ± 0.10 mm, and in the n- hexane extract of porang leaves it had an average zone resistance of 0.34±0.39mm. The results of this study concluded that the three porang leaf extracts with 3 solvents had a different antibacterial activity but the inhibition zone formed was in the weak category.
SINTESIS DAN KARAKTERISASI NANOKOMPOSIT TIO2-SELULOSA DARI LIMBAH AMPAS TEBU Cindhy Novita Sari; Dina Kartika Maharani
Unesa Journal of Chemistry Vol. 14 No. 2 (2025): Vol 14 No 2 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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

Abstract

Sugarcane bagasse is an abundant agricultural waste in Indonesia, reaching more than 750,000 tons annually, yet it remains underutilized. It contains a high cellulose content of up to 52.7%, one of the highest among agricultural residues. Considering its high fiber content and wide availability, sugarcane bagasse has significant potential to be recycled into high-value materials, including nanocellulose, a nanoscale biopolymer with high surface area, mechanical strength, and crystallinity. This study explores the utilization of cellulose derived from sugarcane bagasse, which was subsequently composited with titanium dioxide (TiO₂) nanoparticles to form nanocomposites. Cellulose isolation was carried out using a combined chemical and mechanical method involving alkali treatment, bleaching, and acid hydrolysis, followed by ultrasonication. The nanocomposite synthesis was performed through a wet dispersion method using a water–ethanol mixture. XRD analysis confirmed the successful isolation of nanocellulose, as indicated by an increase in crystallinity index from 51.37% to 70.55% after isolation, with crystal sizes in the nanometer range, that is 4.31 nm for nanocellulose and 35.41 nm for the nanocomposite. FTIR characterization corroborates the success of isolation, showing a decrease in the intensity of functional groups associated with amorphous components such as C=O and aromatic C=C, from 0.0181 to 0.0131 and from 0.0314 to 0.0140, respectively.
ARTIKEL REVIEW :KANDUNGAN EKSTRAK ETANOL DAUN SIRIH (Piper Betle L) SEBAGAI ANTIOKSIDAN Hidayanti, Restu
Unesa Journal of Chemistry Vol. 14 No. 3 (2025): Vol 14 No 3 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n3.p77-82

Abstract

Betel leaf (Piper betle L.) is an Indonesian medicinal plant rich in secondary metabolites with strong natural antioxidant potential. This literature review aimed to analyze the antioxidant activity of major bioactive compounds in betel leaf and to identify the most potent constituents. Relevant articles were collected from PubMed, Google Scholar, and Science Direct using the keywords Piper betle and “antioxidant activity,” focusing on studies employing the DPPH (2,2-diphenyl-1-picrylhydrazyl) assay. Antioxidant activity was expressed as IC₅₀, the concentration required to scavenge 50 % of free radicals. Results demonstrated an inverse relationship between IC₅₀ and antioxidant strength. Compounds with very strong activity included eugenol (18.27 µg/mL), hydroxychavicol (22.50 µg/mL), and total phenolics (21.48 µg/mL). Total flavonoids (35.20 µg/mL) and tannins (42.76 µg/mL) showed strong activity, whereas saponins (53.10 µg/mL) and alkaloids (60.25 µg/mL) were moderate. These findings highlight phenolic constituents—particularly eugenol and hydroxychavicol—as the main contributors to the antioxidant potential of Piper betle ethanol extract and support its use as a natural antioxidant source
PEMANFAATAN SENYAWA KOMPLEKS FE KELAT (EDTA, DTPA, EDDHA, AMINO) DALAM BIDANG PERTANIAN: SEBUAH TINJAUAN Hasibuan, Hanisah; Tarigan, Anjany Tasya Br; Jahro, Iis Siti; Nurfajriani
Unesa Journal of Chemistry Vol. 14 No. 2 (2025): Vol 14 No 2 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n2.p41-49

Abstract

This study discussed the use of iron (Fe) complex compounds in the form of chelates such as EDTA, DTPA, EDDHA, and amino chelates to overcome Fe deficiency in plants. Fe deficiency often occurs in soils with high pH or calcareous soils, which can be seen from chlorosis in leaves and decreased productivity. This study was aimed to review the synthesis, stability, agronomic effectiveness, and environmental impact of various types of Fe chelates. The methods used in this study were literature studies, with data sources covering articles from 2016 to 2025, with a particular focus on articles discussing the use of Fe chelates in plants. The findings of this study indicated that Fe-EDTA works well at low to moderate pH levels but is less stable in alkaline soils. Fe-DTPA showed moderate stability up to pH 7, while Fe-EDDHA had high stability even at pH 9, making it more suitable for calcareous soils. More environmentally friendly alternatives such as Fe-amino chelates have been proven to be more easily absorbed, have a positive impact on the environment, and also function as biostimulants. Therefore, further research is recommended to explore the development of environmentally friendly and effective Fe-chelates in alkaline soils to reduce residues from synthetic materials.
ANALISIS KUALITAS AIR SUNGAI DI SEKITAR PT MERTEX MOJOKERTO BERDASARKAN PARAMETER FISIKA, KIMIA, DAN LOGAM BERAT Ulum, Orisia Toriqotul; Dayinia, Manda Eka; Ainun, Nur; Pramesty, Shinta Dian; Rusmini
Unesa Journal of Chemistry Vol. 14 No. 2 (2025): Vol 14 No 2 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n2.p50-55

Abstract

Rivers are vital water resources that support ecosystems, yet industrial activities may reduce water quality through organic, nutrient, and heavy metal pollution. This study aims to analyze the water quality of rivers surrounding PT Mertex Mojokerto by measuring pH, TDS, DO, ammonia (NH₄⁺), nitrate (NO₃⁻), and heavy metal concentrations, and comparing the results with Indonesian water quality standards (Government Regulation No. 22/2021 and Ministry of Health Regulation No. 32/2017). Water samples were collected and analyzed using a pH meter, TDS meter, DO test kit, and specific test kits for heavy metals, ammonia, and nitrate. The results showed that pH (7.4–7.6), TDS (156 ppm), and DO (7.5 ppm) were within acceptable limits. Ammonia was not detected (0 ppm), while nitrate reached 50 ppm, exceeding the permissible limit (10 ppm). Most hazardous heavy metals were not detected, but zinc (Zn) was recorded at 5 mg/L, far above the maximum allowable concentration of 0.05 mg/L. Overall, the river water quality near PT Mertex is relatively good, although high levels of nitrate and zinc indicate potential pollution that could threaten aquatic ecosystem balance.
SINTESIS SELULOSA DARI LIMBAH AMPAS TEBU (Saccharum Officinarum L.) DENGAN METODE HIDROLISIS ASAM DAN ULTRASONIKASI Balqis Saniatul Mukarromah; Maharani, Dina Kartika
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n1.p28-32

Abstract

The annual increase in sugar factory production can lead to a yearly rise in bagasse waste. An alternative to minimize the increase in bagasse waste is to utilize it as nanocellulose. Bagasse contains 52.7% cellulose, 20% hemicellulose, and 24.2% lignin. The synthesis of nanocellulose was carried out using a combination of chemical and mechanical methods, namely acid hydrolysis and ultrasonication, resulting in a final yield of 39.96%. The FTIR spectra of raw bagasse and bagasse-derived nanocellulose showed changes indicating that the synthesis successfully removed non-cellulosic components such as lignin and hemicellulose. After the nanocellulose synthesis process, a small shoulder appeared at a 2θ angle of 14.5˚, indicating that the synthesis had successfully removed most of the amorphous structures such as lignin and hemicellulose. The nanocellulose from bagasse exhibited two diffraction peaks at 2θ angles of 16.2˚ and 22.2˚, which are characteristic of type I cellulose.

Page 10 of 11 | Total Record : 103

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