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Dina Kartika Maharani
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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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ANALISIS PENAMBAHAN ETANOL PADA PEMBENTUKKAN MISEL DARI SURFAKTAN KATIONIK DAN IMPLIKASINYA TERHADAP DESORPSI CESIUM DARI KAOLINIT Wijayanto, Herry
Unesa Journal of Chemistry Vol. 12 No. 3 (2023): Vol 12 No 3 (2023)
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.v12n3.p83-88

Abstract

This research investigates the impact of adding ethanol to the preparation of cationic surfactant tetradecyltrimethylammonium bromide (TDAB) solutions on the formation of micelles and the efficiency of cesium ions (Cs) desorption from kaolinite surface. The results of the study demonstrate that an increase in TDAB concentration enhances Cs desorption efficiency, reaching a maximum desorption of approximately 84%, attributed to the significant positive charge of the formed micelles. However, the addition of ethanol results in smaller micelles with lower positive charges, consequently reducing the efficiency of Cs ion desorption. Furthermore, the addition of ethanol also raises the critical micelle concentration (CMC), indicating the potential for micelle formation at higher concentrations. The findings of this study offer crucial insights into understanding the complex interactions among surfactants, ethanol, and mineral surfaces, and their relevance in mineral ion recovery applications.
PREPARASI DAN KARAKTERISASI NANOPARTIKEL ZNO/TIO2 DENGAN EKSTRAK DAUN PEPAYA (CARICA PAPAYA L) Ayunda, Defi; Maharani, Dina Kartika
Unesa Journal of Chemistry Vol. 12 No. 3 (2023): Vol 12 No 3 (2023)
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.v12n3.p100-105

Abstract

Green synthesis of metal nanoparticles has become an interesting research area because it offers an environmentally friendly and cost-effective alternative. Green synthesis was successfully carried out using papaya leaf extract (Carica papaya L) where polyphenol compounds were responsible as reducing agents and capping agents. The aim of this research is to determine the characteristics of nanoparticles that have been successfully synthesized using the sol-gel method. ZnO/TiO2 (ZT) nanoparticles have been successfully synthesized using the green synthesis method with papaya (Carica papaya L.) as a reducing agent. FTIR results from ZnO2 nanoparticles produced an absorption pattern of 880.18 cm-1; 850.43 cm-1; 868.57 cm-1; and 874.76 cm-1 is the stretching vibration of Zn-O-Ti. The particle size of ZnO/TiO2 nanoparticles in variations ZT-0, ZT-1, ZT-3, ZT-5, and ZT-7 is 10.469 nm; 10.98nm; 10.21nm; 11.65nm; and 11.04 nm.
REVIEW ARTIKEL: TEKNOLOGI FERMENTASI L-LISIN DAN APLIKASINYA SEBAGAI BAHAN ADITIF PAKAN Hidayah, Nailil; Herdyastuti, Nuniek
Unesa Journal of Chemistry Vol. 12 No. 3 (2023): Vol 12 No 3 (2023)
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.v12n3.p89-99

Abstract

L-lysine is an essential amino acid used in various sectors of the food, chemical and pharmaceutical industries. L-lysine has significant commercial value as a feed additive to promote growth and health in livestock. L-lysine can be produced through two main methods, namely chemical synthesis and microbial fermentation. The demand for L-lysine has been steadily increasing in recent years and is produced every year throughout the world almost through microbial fermentation. L-lysine production through microbial fermentation has the advantage of producing by-products that are non-toxic and have high commercial value. In general, L-lysine is produced using heterotrophic bacterial strains, such as Escherichia coli and Corynebacterium glutamicum. Fermentation time, pH, temperature, glucose concentration, air flow rate and aeration rate are the most important factors in the fermentation process. The L-lysine fermentation process is divided into four parts, namely molasses preparation; preparation of culture media; fermentation; and purification. L-lysine is separated and purified by appropriate downstream processes, involving classical separation or extraction methods (ultrafiltration or centrifugation, ion exchange separation or extraction, crystallization, drying) and sold as powder. Adding L-lysine to feed can improve feed quality. L-lysine can provide benefits in the form of accelerating growth and shortening the production period, so that operational costs can be reduced. This review article discusses L-lysine production, factors influencing L-lysine fermentation, and its application as a feed additive.
REVIEW ARTIKEL: BIOAKTIVITAS SENYAWA FITOKIMIA DUWET (Syzygium cumini) Asry, Meutia; Wikandari, Prima Retno
Unesa Journal of Chemistry Vol. 12 No. 3 (2023): Vol 12 No 3 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

Duwet (Syzygium cumini) merupakan tanaman khas daerah tropis, namun tergolong tanaman langka karena jarang dibudidayakan masyarakat.  Sebenarnya tanaman ini memiliki potensi besar untuk dikembangkan karena senyawa fitokimia di dalamnya memiliki banyak manfaat untuk kesehatan. Kandungan senyawa fitokimia dalam tanaman duwet membuat tanaman ini terindikasi memiliki bioaktivitas yang bervariasi, di antaranya yaitu dapat berperan sebagai antioksidan, antidiabetes, dan antiinflamasi.  Kandungan senyawa flavonoid, fenolik, dan antosianin dalam buah duwet dapat berperan sebagai antioksidan. Senyawa flavonoid, triterpenoid dan tannin dalam duwet dapat menghambat aktivitas enzim yang terlibat dalam metabolisme glukosa sehingga dapat berperan sebagai antidiabetes. Senyawa flavonoid dalam buah duwet juga dapat berperan sebagai antiinflamasi. Artikel review ini membahas tentang botani duwet, kandungan fitokimia dan bioaktivitasnya sebagai antioksidan, antidiabetes, dan antiinflamasi, serta mekanisme kerjanya di dalam tubuh. Informasi ini akan sangat bermanfaat untuk menambah wawasan tentang duwet sebagai salah satu pangan fungsional dan sebagai dasar pengembangan penelitian inovatif berbahan dasar buah duwet untuk meningkatkan nilai tambah tanaman duwet di masa mendatang.
POTENSI MINUMAN SARI KULIT SINGKONG FERMENTASI DENGAN KULTUR STARTER Lactobacillus plantarum B1765 SEBAGAI ANTIOKSIDAN Khoiriyah, Istamanul; Wikandari, Prima Retno
Unesa Journal of Chemistry Vol. 12 No. 3 (2023): Vol 12 No 3 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

Cassava peel is a source of phenolic that function as antioxidants. However, phenolic in nature is in the bound-shaped limits its potential as an antioxidant. A method to optimize antioxidant activity is fermentation. This research studied the growth of lactic acid bacteria (LAB), pH, total titratable acid (TTA), total phenolic content (TPC), and antioxidant activity of cassava peel extract drink with Lactobacillus plantarum B1765 as culture starter that fermented in 0, 12, 24, 36, 48, and 60 hours at 37ºC. Total LAB was determined using Total Plate Count, pH determination using pH meter, TTA using acid-base titration, TPC using Folin-Ciocalteu method, and antioxidant activity using DPPH radical scavenging method. These results showed that the length of fermentation affected increasing the total LAB, TTA, TPC, antioxidant activity, and decreasing of pH Total BAL increased optimally reached 4.91×107 CFU/mL at 48 hours, while pH decreased, TTA, TPC, and antioxidant increased still occur up to 60 hours, with pH 3.52, TTA 0.247%, TPC 115.948 mg GAE/g, and IC50 value 64.392 ppm which categorized as strong antioxidants. The resulting product has met the standards of fermentation beverage, so it could be developed as a potentially functional beverage as antioxidant agent.
PERBANDINGAN PENGARUH PENGGUNAAN ZAT PENGATUR TUMBUH EKSTRAK BAWANG BOMBAY MERAH (Allium cepa L.) DAN BAWANG MERAH (Allium ascalonicum L.) TERHADAP PERTUMBUHAN TANAMAN SELADA (Lactuca Sativa.) Waskito, Rusyariyanto; Anggarani, Mirwa Adiprahara
Unesa Journal of Chemistry Vol. 13 No. 1 (2024): Vol 13 No 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

Vegetables are a food ingredient that has an important role in the body. This causes increasing consumer demand for vegetables, especially organic vegetables. To meet consumer needs for organic vegetables, innovation in cultivation is needed, one of which is the use of Growth Regulators (GRS). Natural ingredients that can be used as GRS are shallots and red onions. This research aims to identify the effect of using ZPT from the allium genus on lettuce cultivation. Phytohormones can have a major influence on cell division and root elongation and stimulate the growth of leaves and stems. This research was carried out on lettuce plants using a Randomized Block Design (RBD) with 7 treatments and 6 repetitions. The parameters used in this research include plant height, leaf circumference, number of leaves, and plant wet biomass. The results of the study showed that GRS from shallots with a concentration of 45% gave the highest yields on lettuce plants with the parameters of plant height, number of leaves, leaf circumference, and wet biomass respectively, namely 20,75 cm, 20 leaves, 34 cm and 20,33 grams
A SINTESIS KITOSAN DARI CANGKANG KERANG DARAH (Anadara granosa) SEBAGAI BIOSENSOR UNTUK DETEKSI PESTISIDA MENGGUNAKAN MEMBRAN Au/KITOSAN Pharnanda, Rossella; Prasetya, Predian Yudha; Handayani, Suci Tri; Fatehah, Aura Amalia; Basukiwardojo, Maria Monica Sianita
Unesa Journal of Chemistry Vol. 13 No. 1 (2024): Vol 13 No 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

Pesticides are chemicals that can kill or control pests. However, the current use of pesticides poses a threat to humans and the environment. This research aims to develop a biosensor with Au/Chitosan membrane electrode using chitosan from blood clam shell waste which has high sensitivity to pesticides, fast response time, and long-term stability. So as to achieve the target of Sustainable Development Goals (SDG's) 3, namely health and well-being. The method used is the preparation of blood clam shells, synthesis of chitosan from blood clam shells, making Au/Chitosan membrane electrodes, characterisation of pesticide detection biosensors. The results of FTIR testing of chitosan obtained a degree of deacetylation of 86.3202%. The successfully made Au/Chitosan membrane electrode has an optimum concentration of 5% with the best measurement at pH 7, deposition time of 5 seconds, and scan rate of 0.1 V/s.  Characterisation of carbamate pesticide detection biosensor using Au/Kitosan electrode shows that the Nernst factor obtained is 35.46 mV/decade, detection limit is 2x10 -8 M, measurement range is 10-8 M to 10-2 M, response time is 5-7 minutes, and precision with coefficient of variation for 10-4 M and 10-2 M concentration is 1.095% and 0.412% so that the Au/Chitosan membrane electrode can be used to detect carbamate pesticides effectively.
PENGARUH PENAMBAHAN ENZIM PAPAIN DARI KULIT PEPAYA VARIETAS BERBEDA TERHADAP RENDEMEN DAN KUALITAS VCO khasanah, ismi; Herdyastuti, Nuniek
Unesa Journal of Chemistry Vol. 13 No. 1 (2024): Vol 13 No 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

VCO is a modification of the process of making coconut oil so that a purer product is produced. VCO can be made using various methods such as fermentation, acidification and enzymatic using protease enzymes such as papain. This research aims to determine the effect of adding the papain enzyme from Bangkok and California papaya peel varieties on the yield and quality of VCO. The quality of VCO determined is water content using the gravimetric method, free fatty acid content and peroxide value using the titrimetric method. The quality of VCO with the addition of papain enzyme from Bangkok papaya skin which has an activity value of 3.66 U/mL obtained a yield of 63.50%, water content of 0.71%, free fatty acid content of 0.32%, peroxide value of 3.50 meq /kg, and the density is 0.91 g/cm3. Meanwhile, VCO with the addition of papain enzyme from California papaya skin which had an activity value of 5.04 U/mL obtained a yield of 67.80%, water content of 0.17%, free fatty acid content of 0.16%, peroxide value of 2.00 meq/kg, and the density is 0.82 g/cm3. Based on SNI 7381-2008 VCO with the addition of papain enzyme from California papaya skin, the quality meets quality standards.
PENGARUH PENAMBAHAN ENZIM PAPAIN DAN ENZIM BROMELIN TERHADAP HIDROLISAT PROTEIN DARI AMPAS KELAPA Ridhwan, Alverdha Elvarheta Rasseta; Herdyastuti, Nuniek
Unesa Journal of Chemistry Vol. 13 No. 1 (2024): Vol 13 No 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

Coconut dregs waste has potential to be used as protein hydrolysate with addition of papain enzyme and bromelain enzyme. The study aimed to analyze the effect of enzyme concentration and hydrolysis time on coconut pulp protein hydrolysate based on yield, protein content, and degree of hydrolysis. The enzyme concentration used variations of 1, 3, 5, 6, and 7% (b/v) which were hydrolyzed for 240 minutes. Determination of protein content was done by Bradford method and measurement of hydrolysis degree by SN-TCA method. The results showed the best protein hydrolysate in addition of papain enzyme at 7% concentration with a yield of 24.70%, protein content of 0.03450 mg/mL, and degree of hydrolysis of 48.04%. These results were greater than addition of 7% concentration of bromelain enzyme with a yield of 18.46%, protein content of 0.03067 mg/mL, and degree of hydrolysis of 42.30%. The variation of hydrolysis time was 150, 180, 210, 240, and 270 minutes with 7% enzyme concentration for each enzyme. The results showed that the best hydrolysis time was 270 minutes with papain enzyme which produced 23.44% yield, 0.03550 mg/mL protein content, and 65.36% hydrolysis degree. These results are greater than the hydrolysis time of 270 minutes with bromelain enzyme producing a yield of 17.06%, protein content of 0.03360 mg/mL, and degree of hydrolysis of 50.20%. This study showed that protein hydrolysate with the addition of papain enzyme showed better results than the addition of bromelain enzyme.
PEMBENTUKAN SENYAWA MALTODEKSTRIN DARI PATI BENGKUANG (Pachyrhizus erosus L.) MELALUI HIDROLISIS ENZIM α-AMILASE Liano, Ireniza; Herdyastuti, Nuniek
Unesa Journal of Chemistry Vol. 13 No. 1 (2024): Vol 13 No 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

Jicama (Pachyrhizus erosus L.) is one of the tubers with potential as a starch source. Starch can be hydrolyzed into maltodextrin compound using α-amylase enzyme. This study aims to determine how the effect of the addition of starch weight and the length of hydrolysis time on the formation of maltodextrin compounds by manipulating the addition of bengkuang starch weight with a mass of 5, 10, 15, 20, and 25g and the length of α-amylase enzyme hydrolysis time for 100, 120, 140, 160 and 180 minutes with the α-amylase enzyme adding 20% (w/v). The results showed that the addition of 20 grams of bengkuang starch weight obtained a yield of 70.47%; dextrose equivalent value of 12.56; and residual starch content of 42.13%.  The length of time for hydrolysis of jicama starch for 180 minutes produced a yield of 72.45%; dextrose equivalent value of 15.81; and residual starch content of 26.01%. Based on the results obtained, it shows that the addition of weight of jicama starch and the length of time for hydrolysis using the α-amylase enzyme affect the dextrose equivalent value of maltodextrin.

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