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All Journal Jurnal Natur Indonesia Biologi Edukasi : Jurnal Ilmiah Pendidikan Biologi Microbiology Indonesia Jurnal AgroBiogen Elkawnie Molecular and Cellular Biomedical Sciences (MCBS) Jurnal Penelitian Pendidikan IPA (JPPIPA) Biosaintifika: Journal of Biology & Biology Education Jurnal Entomologi Indonesia
Lenni Fitri
Universitas Syiah Kuala
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Education Engineering Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Neuroscience Physics

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Perubahan morfologi larva nyamuk akibat pemberian larvasida bakteri kitinolitik Yekki Yasmin; Lenni Fitri
Jurnal Entomologi Indonesia Vol 10 No 1 (2013): April
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.208 KB) | DOI: 10.5994/jei.10.1.18

Abstract

The aim of this research is to evaluate the change of Aedes aegypti L. and Culex spp. larvae morphology effected by chitinolitic bacteria as larvacide. This research was conducted in Microbiology Laboratory, Faculty of Math and Natural Science, University of Syiah Kuala. The sample was taken from several areas in Banda Aceh and Aceh Besar. The isolation was accomplished by plating 1 ml of sample water on chitin agar medium and incubating for 48–72 hours in 30 °C temperature. In the experimental method, three concentrations of chitinolitic bacteria (0.5, 1.0, and 1.5 ml) in 7 days observation were used as a treatment. The research resulted in 6 isolates having the potential to be developed firther as chitinolitic bacteria. The result shows that chitinolitic bacteria degrades exosceleton of second instar larvae of Aedes aegypti and Culex spp. Degradation of exoskeleton started on the 4th days and occurred at the thorax region. All exoskeleton from both species are completely broken on day six.
Isolation and Characterization of Thermophilic Bacteria as Cellulolytic Enzyme Producer from the Hot Spring of Ie Seuum Aceh Besar, Indonesia RUHUL KHALILA; lenni fitri; SUHARTONO SUHARTONO
Microbiology Indonesia Vol. 14 No. 1 (2020): March 2020
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1580.621 KB) | DOI: 10.5454/mi.14.1.4

Abstract

Cellulase enzymes can be isolated from thermophile bacteria obtained from the hot spring Ie Seuum, Aceh Besar. This research aimed to recover and characterize the isolates morphologically and biochemically followed by determination of the thermophile bacterial isolates potential as cellulolytic enzyme producers,. The sampling method in this research was conducted by a purposive sampling at temperature of 70 oC, 60 oC and 50 oC. Isolation of thermophilic bacteria was carried out on nutrient agar (NA) media. There were four isolates of thermophilic bacteria isolated recovered at 70 oC, five isolates at 60 oC, and seven isolates at 50 oC. Of the 18 isolates obtained, 15 of them were able to produce cellulase enzymes. Cellulase enzyme production can be determined by the presence of clear zones around bacterial colonies on CMC media after addition of 1% congo red drops and wash with 1 M NaCl. The highest five Cellulolytic Index (CI) values ​​were obtained from isolates ISB75; ISB64; ISB52; ISB54; ISB56 that were 1.23; 2.22; 1.39; 1.59; 1.10, respectively. Biochemical tests carried out on 5 isolates with the highest cellulolytic index values showed that the bacterial isolate were suspected to be from the genera of Bacillus sp.
Production of Lipase Enzyme by Marine Actinobacteria With Various pH and Temperature Aulia, Muhammad Rizqi; Agustriana, Eva; Fitri, Lenni
Elkawnie: Journal of Islamic Science and Technology Vol 10, No 2 (2024)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v10i2.16724

Abstract

Abstract: The demand for enzymes as biocatalysts in industry is very high. Research and development of different types of enzymes from different sources has started. One very important enzyme to study is the enzyme lipase. Lipase enzymes are enzymes of the hydrolase class that catalyze the hydrolysis of triglycerides to glycerol and free fatty acids. Lipases are found in a variety of sources including animals, plants, and microorganisms. Marine microorganisms, including marine actinobacteria, cannot be separated from this enzyme source's research and development process. The purpose of this study was to obtain a test protocol and optimal pH and temperature conditions for the hydrolysis reaction by lipase enzymes from marine actinobacteria. Optimal pH and temperature conditions for hydrolysis reactions by lipase enzymes from marine actinobacteria using spectrophotometry at different pH values and different temperatures of 3, 4, 5, 6, 7, 8, 9, and 10. Temperatures of 30 °C, 40 °C, 50 °C, 60 °C, 70 °C, 80 °C and 90 °C are measured at a wavelength of 405 nm. The results showed that the activity of the lipase enzyme at pH 9 with Tris-HCl buffer was the optimum pH, and the temperature of 70°C was the optimum temperature for the lipase hydrolysis reaction of marine actinobacteria.Abstrak: Kebutuhan enzim sebagai biokatalisator dalam bidang industri sangat tinggi. Berbagai macam enzim dari beragam sumber sudah mulai diteliti dan dikembangkan. Salah satu enzim yang sangat penting untuk diteliti adalah enzim lipase. Enzim lipase merupakan enzim golongan hidrolase yang mengkatalis proses hidrolisis trigliserida menjadi gliserol dan asam lemak bebas. Lipase dapat ditemukan dalam berbagai sumber seperti pada hewan, tumbuhan, dan mikroorganisme. Mikroorganisme laut tidak terlepas dari proses penelitian dan pengembangan sumber enzim ini termasuk Actinobacteria laut. Tujuan penelitian ini adalah untuk memperoleh protokol uji dan kondisi pH dan temperatur optimum reaksi hidrolisis oleh enzim lipase dari Actinobacteria laut. Kondisi pH dan temperatur optimum reaksi hidrolisis oleh enzim lipase dari Actinobacteria laut dilakukan secara kuantitatif dengan metode spektrofotometri pada variasi pH 3, 4, 5, 6, 7, 8, 9, dan 10 dan variasi suhu 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, dan 90°C diukur pada Panjang gelombang 405 nm. Hasil menunjukkan bahwa aktivitas enzim lipase pada pH 9 menggunakan buffer Tris HCl merupakan pH optimum dan temperatur 70°C merupakan temperature optimum reaksi hidrolisis enzim lipase dari Actinobacteria laut.
Endophytic Bacteria in Acalypha indica L. Leaves and Their Antimicrobial Activity Against Staphylococcus aureus and Candida albicans Syafitri, Aini; Fitri, Lenni; Suhartono, Suhartono
Molecular and Cellular Biomedical Sciences Vol 9, No 2 (2025)
Publisher : Cell and BioPharmaceutical Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21705/mcbs.v9i2.609

Abstract

Background: The anting-anting plant (Acalypha indica L.) is used in herbal medicine in the treatment of various diseases. The leaf extract of this plant is known for its antimicrobial activity, but the antimicrobial properties of the endophytic bacteria within its leaves have never been reported. This research aims to determine the antimicrobial activity of endophytic bacteria from the leaves of the anting-anting plant. Materials and methods: The isolation of endophytic bacteria was performed using the spread plate method on nutrient agar (NA) media. Following isolation, the bacterial isolates were characterized through macroscopic and microscopic examination, as well as biochemical tests, which included indole production, hydrogen sulfide (H2S) production, motility, Simmons citrate utilization, methyl red-Voges-Proskauer (MR-VP) test, catalase test, and triple sugar iron agar (TSIA) test. Identification of the bacterial isolates was conducted according to Bergey's Manual of Systematic Bacteriology. Additionally, the antimicrobial activity of the isolates was assessed using the diffusion methodResults: Fourteen isolates of anting-anting leaf endophytic bacteria were obtained (coded as BEDA 1 to BEDA 14). The BEDA 5 isolate exhibited the largest inhibitory zone diameter against Staphylococcus aureus (31.48 mm), while BEDA 9 showed a significant inhibitory zone diameter against Candida albicans (17.84 mm). Conclusion: The two isolates (BEDA 5 and BEDA 9) exhibited significant antimicrobial activity, indicating their potential as promising candidates for alternative antimicrobial agents. These results suggest that endophytic bacteria from Acalypha indica may play an essential role in combating antibiotic resistance and in the development of new therapeutic strategies.Keywords: endophytic bacteria, characterization, antimicrobial activity, Acalypha indica
The Effect of Adding Water Hyacinth (Eichhornia crassipes) Fermented with Aspergillus niger in Feed on Protein Retention of Tilapia (Orechormis niloticus) Syavira Azzahra; Firdus Firdus; Lenni Fitri
Jurnal Penelitian Pendidikan IPA Vol 11 No 12 (2025): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i12.10029

Abstract

Feed is one of the important factors in fish farming, because it can account for 60–70% of the total operational costs of cultivation. The purpose of this study was to analyze the effect of providing water hyacinth (Eichhornia crassipes) fermented with Aspergillus niger as feed on the growth performance of tilapia (Oreochromis niloticus). This study used an experimental method and a Completely Randomized Design (CRD) consisting of five treatments and three replications, with the composition of P0 (commercial pellets) as the control, P1 (30% unfermented water hyacinth flour), and P2 (10%), P3 (20%), and P4 (30%) fermented water hyacinth flour. The results of this study showed that the addition of water hyacinth flour fermented with Aspergillus niger had no significant effect (P > 0.05) on tilapia protein retention. It was also known that the water quality in the tilapia maintenance media was within the optimal range.
Secondary Metabolites Profiling and Antimicrobial Activities of Ethanol Extract from Jamblang (Syzygium cumini L.) Stem Bark Fayza Meutia; Yulia Sari Ismail; Lenni Fitri
Jurnal Penelitian Pendidikan IPA Vol 11 No 5 (2025): May
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i5.10589

Abstract

This study was conducted to determine the secondary metabolite compounds and evaluate the antimicrobial activity of ethanol extract of jamblang stem bark (Syzygium cumini). The method used in this research is experimental method. The extraction was carried out using the maceration method with 96% ethanol as the solvent. Secondary metabolite compounds of the extract samples were analyzed using a Gas Chromatography-Mass Spectrometry (GC-MS). Antimicrobial activity of the extract against Cutibacterium acnes, Staphylococcus aureus, and Candida albicans using disc diffusion method tested on MHA (Mueller Hinton Agar) media with extract concentrations of 40%, 60%, 80%, and 100%.  Each experiment was repeated three times to ensure validity. The results revealed that the extract have dominant compounds such as 7-Tetradecenal (Z), Octadecanoic acid, and n-Hexadecanoic acid. The antimicrobial test showed that the highest inhibition zones were 7.45 mm for C. acnes, 8.04 mm for S. aureus, and 4.60 mm for C. albicans at 100% extract concentration. The inhibition zones increased with higher extract concentrations, indicating a dose-dependent relationship. Compared to the positive control results (20.70 mm; 22.29 mm; and 18.62 mm) the extract showed moderate antimicrobial activity. These findings suggest that jamblang stem bark extract has potential as a natural antimicrobial agent.
The Endophytic Actinobacterial Toxicity Test of Ginger (Zingiber officinale Roscoe) Used The BSLT (Brine Shrimp Lethality Test) Method Sri Rahayu; Lenni Fitri; Yulia Sari Ismail
Elkawnie Vol. 7 No. 1 (2021)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v7i1.8027

Abstract

Abstract: Cancer is the biggest cause of death in Indonesia. Cancer treatment efforts have been made but it could harm cancer patients. It is necessary to find another alternative from nature as an anticancer. This study aims to see the ability of endophytic actinobacterial isolates from ginger (Zingiber officinale) as an anticancer tested using the BSLT method (Brine Shrimp Lethality Test) by calculating the values of LC50 and LT50. The best value isolates from the BSLT method, then tested using phytochemical ethanol extract. The highest toxicity value was found in AJ2 isolates. LC50 and LT50 values of AJ2 isolates were 309.358 µg/ml and 11.879 hours. Phytochemical results of ethanol extract of AJ2 isolates were detected containing steroids, terpenoids, phenols, tannins, flavonoids, alkaloids, and saponins. AJ2 isolates which derived from ginger endophytic actinobacteria have potential as an anticancer because they have high toxic values that rised rapidly.Abstrak: Kanker menjadi penyebab kematian terbesar di Indonesia. Upaya pengobatan kanker sudah dilakukan namun memberikan dampak negatif bagi penderita kanker. Perlu dilakukan penemuan alternatif lain berasal dari alam sebagai antikanker. Penelitian ini bertujuan untuk melihat kemampuan isolat aktinobakteri endofit asal jahe (Zingiber officinale) sebagai antikanker. 7 isolat aktinobakteri endofit jahe diuji menggunakan metode BSLT (Brine Shrimp Lethality Test) dengan menghitung nilai LC50 dan LT50. Isolat nilai terbaik dari metode BSLT, selanjutnya diuji  menggunakan fitokimia ekstrak etanol. Nilai toksisitas tertinggi terdapat pada isolat AJ2. Nilai LC50 dan LT50 isolat AJ2 adalah 309,358 µg/ml dan 11,879 jam. Hasil fitokimia ekstrak etanol isolat AJ2 terdeteksi mengandung steroid, terpenoid, fenol, tanin, flavonoid, alkaloid dan saponin. Isolat AJ2 yang berasal dari actinobacteria endofit jahe berpotensi sebagai antikanker karena memiliki nilai toksik yang tinggi dalam waktu singkat.
Toxicity, Antioxidant and Antibacterial Test of Ethyl Acetate Extract of Jamblang Leaves (Syzygium cumini L.) Zultira Harina Roza; Lenni Fitri; Amalia
Jurnal Penelitian Pendidikan IPA Vol 12 No 4 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i4.12634

Abstract

Jamblang (Syzygium cumini L.) is a plant from the Myrtaceae family that is used as a traditional medicine, especially its leaves. This study aims to determine the toxicity, antioxidant, and antibacterial activities of the ethyl acetate extract of jamblang leaves and to identify its secondary metabolite compounds. The toxicity test using the Brine Shrimp Lethality Test (BSLT) method showed that the ethyl acetate extract of jamblang leaves had an LC₅₀ value of 174.602 ppm, which falls into the toxic category. The antioxidant test using the DPPH method showed an IC₅₀ value of 4.268 µg/mL, which is classified as strong, although still weaker than vitamin C (IC₅₀ = 2.437 µg/mL). The antibacterial test against Streptococcus mutans using the disc diffusion method produced inhibition zones of 2.58 mm (20%), 6.61 mm (30%), and 9.08 mm (40%), with a Minimum Inhibitory Concentration (MIC) value of 25%. Identification of secondary metabolites using GC-MS revealed 38 compounds belonging to terpenoid, ester and aromatic Hyhrocarbons groups. These results indicate that the ethyl acetate extract of jamblang leaves possesses toxicity, antioxidant, and antibacterial properties, thus having the potential to be developed as a phytopharmaceutical.
Co-Authors Amalia Anja Meryandini Aulia, Muhammad Rizqi Betty Mauliya Bustam Dyah Iswantini Eva Agustriana Fayza Meutia Firdus Firdus Fitria Ardani Ismail, Yulia Sari Putriani, Putriani Putriani, Putriani RUHUL KHALILA Safriani, Suri Raihan Sri Rahayu Suhartono Suhartono Syafitri, Aini Syavira Azzahra Warzatullisna, Warzatullisna Yekki Yasmin Yekki Yasmin Yekki Yasmin Yekki Yasmin Yulia Sari Ismail Yulia Sari Ismail Yulia Sari Ismail YULIN LESTARI Zultira Harina Roza