cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
Jurnal Penelitian Saintek
Published by Universitas Negeri Yogyakarta
ISSN : 14123991     EISSN : 25287036     DOI : 10.21831
Core Subject : Science,
Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 31, No 1 (2026)" : 6 Documents clear
Synthesis, characterization, and micellar behavior of amphiphilic chitosan bearing sulfate and anisaldehyde imine groups Herayati
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.89435

Abstract

Amphiphilic chitosan derivatives bearing sulfate and anisaldehyde imine (anisimine) groups were successfully synthesized and characterized for potential applications as functional biomaterials. The synthesis involved two key steps: (1) sulfation of chitosan using chlorosulfonic acid to introduce O-sulfate groups, and (2) Schiff base formation via reaction with p-anisaldehyde to generate N-anisimine functionalities. Structural modifications were confirmed by Fourier-transform infrared (FTIR) spectroscopy, which showed characteristic absorption bands at ~1250 cm⁻¹ and ~820 cm⁻¹ corresponding to O=S=O stretching of sulfate, and a C=N stretch at ~1640 cm⁻¹ indicating imine formation. Proton nuclear magnetic resonance (1H-NMR) spectra further verified the successful attachment of aromatic protons from p-anisaldehyde and the disappearance of primary amine peaks, confirming imination. The amphiphilic behavior and micelle-forming ability of the N-anisimine-O-sulfated (NAOS) chitosan were evaluated using pyrene as a hydrophobic fluorescent probe for determining the critical micelle concentration (CMC), which was found to be 0.012 mg/mL. The observed low CMC value indicates strong self-assembly capability in aqueous media. These results suggest that NAOS chitosan possesses promising structural and surface-active properties suitable for advanced applications in drug delivery and cosmetic formulations.
Threshold space in the context of communal ritual: the kilungan fence and spatial transformation in the Buka Luwur Sunan Kudus tradition Anisa Anisa; Edi Purwanto; Agung Budi Sardjono; Resza Riskiyanto
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.89497

Abstract

Space in the cultural approach and perspective is not only a physical space but also as a meaningful phenomenon. This meaning can be formed through shared experiences and religious-ritual activities. One of the communal rituals that demonstrates the dynamics of unique spaces in the Old City of Kudus is the tradition of Buka Luwur Sunan Kudus. This tradition of Buka Luwur Sunan Kudus is a cultural-religious ritual held once a year in the month of Muharram in the Old City of Kudus. The center of the Buka Luwur activity is in the area of ​​the Mosque, Tajug, and the Tomb of Sunan Kudus. One of the architectural elements that plays a role in the Buka Luwur tradition is the kilungan fence around the center of the activity. This study aims to examine the function of the threshold space in the cultural-religious practices of the Kudus community, analyze the transformation of space during the Buka Luwur tradition, and explain how the concept of space and boundaries become an integral part of communal and spiritual experiences. In accordance with the research objectives, this study uses a post-positivistic paradigm. Data collection was carried out through field observations and interviews during the procession. The results of this study demonstrate that during the Buka Luwur tradition, the kilungan fence not only serves as a boundary but also as a threshold element. The narrow, straight corridor bordered by the tall, massive kilungan fence becomes a threshold space that conveys, mediates, and accompanies spatial experiences. This spatial experience is between everyday space and the temporal sacred space. The kilungan fence, with its long, straight form, binds the Buka Luwur activity and directs movement. The kilungan fence not only plays a physical role but also has a meaningful meaning, symbolizing the path to the sacred center. The results of this study enrich the concept of threshold space, especially when rituals occur within it.
The effect of zeolite activation and time variation of batch method on the adsorption effectiveness of iron metal ions Suyanta Suyanta; Sunarto Sunarto; Susila Kristianungrum; Lalang Egalitera Pambayun
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.91097

Abstract

This study aims to evaluate the effectiveness of three types of zeolite, namely fresh zeolite, saturated zeolite, and zeolite activated using 0.5 M sulfuric acid in adsorbing iron metal ions (Fe³⁺) from simulated wastewater solutions. This study also aims to understand the effect of variations in contact time (1 to 5 days) on the adsorption efficiency of Fe³⁺ ions, as well as to prove whether the activation process is able to regenerate the adsorption capacity of saturated zeolites. The method used is a laboratory-scale batch method, where each type of zeolite is immersed in a 10 ppm FeCl₃ solution for 1 to 5 days. Each treatment was carried out on 15 samples, and the Fe³⁺ ion content after the adsorption process was measured using an Atomic Absorption Spectrophotometer (AAS). Zeolite activation was carried out by immersing saturated zeolite in 0.5 M H₂SO₄ for 24 hours, followed by washing to neutral pH and drying at 200°C.  The results showed that the average efficiency of activated zeolite reached 99.15%, which is only 0.4% smaller than the average adsorption efficiency of fresh zeolite which is 99.55%. Saturated zeolite without activation showed a significant decrease in performance with an average efficiency of only 61.852%. Based on the results of the ANOVA test showing a p-value of 0.001 which is smaller than the p-value of 0.005 in the table, there is a difference in adsorption between activated zeolite and fresh zeolite with saturated zeolite. This indicates that acid activation of zeolite can effectively regenerate the adsorption capacity and extend the service life of zeolite in chemical waste treatment.  
The antibacterial potential of curly red chili pepper (Capsicum annuum L.) fruit stem waste against foodborne disease bacteria Dwi Susanti; Salsabilla Ardi Wardhani; Agustina Retnaningsih
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.93584

Abstract

Foodborne diseases remain a global health problem, commonly caused by bacteria such as Salmonella typhi, Escherichia coli, Bacillus cereus, and Staphylococcus aureus. The utilization of natural materials, such as curly red chili pepper fruit stem waste with antimicrobial activity, may serve as an alternative natural treatment for infections caused by these pathogens. This study aimed to evaluate the antibacterial potential of curly red chili pepper (Capsicum annuum L.) fruit stem waste extract as a natural antibacterial agent. The waste material was extracted using a maceration method with 96% ethanol as the solvent. The extract was qualitatively analyzed through phytochemical screening, which revealed the presence of flavonoids, saponins, tannins, alkaloids, steroids, and phenolic compounds. Antibacterial activity was evaluated using the disc diffusion method at extract concentrations of 100%, 90%, 80%, and 70%. The results showed that all concentrations produced inhibition zones categorized as “resistant” according to CLSI standards, with ciprofloxacin as the positive control and distilled water as the negative control. The 100% extract concentration exhibited the largest inhibition zone, with the mean inhibition zones against Bacillus cereus and Staphylococcus aureus (Gram-positive bacteria) being greater than those against Salmonella typhi and Escherichia coli (Gram-negative bacteria). These findings indicate that curly red chili pepper fruit stem extract possesses weak antibacterial activity and requires further investigation.
Effectiveness of soaking in bilimbi (Averrhoa bilimbi) extract in the treatment of formalin-contaminated salted lencam fish (Lethrinidae) Harianti Harianti; Meri Astuti; Ratnawati Ratnawati; Besse Firma Jamal
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.94485

Abstract

The widespread use of formalin as an illegal preservative in fish products poses serious risks to public health, highlighting the urgency of developing safe and natural mitigation methods. This study investigates the effectiveness of soaking salted lencam fish (Lethrinidae) in bilimbi (Averrhoa bilimbi L.) extract to reduce formalin levels. The research was conducted from August to September 2022 in three traditional markets—Palattae, Laccibung, and Patimpeng—in Bone Regency, Indonesia, with laboratory analysis performed at the Fishery Product Quality Implementation Center. An experimental approach was used, involving samples obtained from six fish traders, of which two samples (A1 and B2) were identified as positive for formalin contamination. These samples were treated by soaking in 70% bilimbi extract for 30 minutes, and data were analyzed using a paired t-test with SPSS 16.0. The results showed a notable reduction in formalin levels, where sample A1 decreased from 9 mg/kg to 5.6 mg/kg and sample B2 from 9 mg/kg to 5.2 mg/kg, with an average reduction of approximately 62% (60% and 64%, respectively). These findings indicate that bilimbi extract is effective as a natural agent for reducing formalin contamination in salted fish products. In conclusion, soaking salted lencam fish in bilimbi extract provides a practical and safer alternative for improving food safety and protecting consumer health. 
Optimization of Singkarak hydropower outflow for renewable micro hydropower development Rosnita Rauf; Harry Setya Hadi; Hazlif Najif
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.95116

Abstract

The government's initiative to enhance energy resilience and independence includes the augmented use of green energy. PLTA Singkarak is a renewable energy facility that harnesses water from Lake Singkarak to operate its turbines, featuring an average tailrace discharge of 30 m³/s. The Singkarak Hydroelectric Power Plant receives its energy from PLN's Singkarak Substation, utilizing a 5 MVA transformer for distribution to meet its own consumption needs. Consequently, each month, the Singkarak Hydroelectric Power Plant must reduce its total kWh output by its own use, averaging 4,127.8 kW each day. A small-scale Micro Hydro power plant will be developed to utilize the potential water source at the outflow of the Singakrak Hydroelectric Power Plant, serving as the primary supply for the facility, and so decreasing the company's performance target for its own consumption. A sufficiently big outflow tailrace discharge is likely to be repurposed for a micro-hydropower plant. The initial elevation of the Singkarak Hydroelectric Power Plant tailrace exit is 71 meters above sea level, whereas the end elevation is 67 meters above sea level, as measured by hand. A micro-hydropower plant (PLTMH) can be engineered with a net head of 3.8 m and a flow rate of 10.618 m³/s, yielding a maximum power output of 327.8 kW. The turbine employed is a Kaplan turbine, while the generator utilized is a 3-phase synchronous generator, with both components functioning at 1000 rpm . This PLTMH design can supplant the self-consumption of the Singkarak hydropower plant (PLTA), hence enhancing the system's energy efficiency.

Page 1 of 1 | Total Record : 6

 1 

Filter by Year

2026 2026


Reset
Filter By Issues
All Issue Vol 31, No 1 (2026) Vol 30, No 2 (2025) Vol 30, No 1 (2025) Vol 29, No 2 (2024) Vol 29, No 1 (2024) Vol 28, No 2 (2023) Vol 28, No 1 (2023) Vol 27, No 2 (2022) Vol 27, No 1 (2022) Vol 26, No 2 (2021) Vol 26, No 1 (2021) Vol 25, No 2 (2020) Vol 25, No 1 (2020) Vol 24, No 2: Oktober 2019 Vol 24, No 1: April 2019 Vol 23, No 1 (2018): April 2018 Vol 23, No 2: Oktober 2018 Vol 22, No 2: Oktober 2017 Vol 22, No 1: April 2017 Vol 21, No 2: Oktober 2016 Vol 21, No 1: April 2016 Vol 20, No 2: Oktober 2015 Vol 20, No 1: April 2015 Vol 19, No 2: Oktober 2014 Vol 19, No 1: April 2014 Vol 18, No 2: Oktober 2013 Vol 18, No 1: April 2013 Vol 17, No 1: April 2012 Vol 16, No 2: Oktober 2011 Vol 16, No 1: April 2011 Vol 15, No 2: Oktober 2010 Vol 15, No 1: April 2010 Vol 14, No 1: April 2009 Vol 13, No 1: April 2008 Vol 12, No 2: Oktober 2007 Vol 12, No 1: April 2007 Vol 11, No 1: April 2006 Vol 10, No 2: Oktober 2005 Vol 10, No 1: April 2005 Vol 9, No 1: April 2004 Vol 8, No 2: Oktober 2003 Vol 8, No 1: April 2003 Vol 7, No 2: Oktober 2002 Vol 7, No 1: April 2002 Vol 6, No 1: Saintek 2001 More Issue