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Prakoso, Nurcahyo Iman
UII
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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PEMANFAATAN BAHAN ALAM DALAM KONSERVASI DAN ANALISIS PRASASTI TIMAH Prakoso, Nurcahyo Iman; Alifia Tia , Aulia; Ria Diar Stya, Primastiti
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 10 No. 1 (2025): Volume 10, ISSUE 1, 2025
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol10.iss1.art4

Abstract

Artifact preservation efforts require conservation approaches that are environmentally friendly and compatible with the original materials of the object. This study examines the use of natural materials in artifact conservation, focusing on three main materials: rabbit skin glue as an adhesive, beeswax as a protective layer, and compositional analysis on tin inscriptions. FTIR testing showed the presence of protein content in rabbit skin that can produce gelatin to be used as an adhesive. Rabbit skin glue adhesion testing was conducted on ceramic and wood media with various glue concentrations (5%, 10%, 15%, 20%, and 37.5%) under humid conditions (90% humidity and 26°C temperature) for three consecutive days. The test results showed that on the third day, only the 37,5% concentration was able to survive. In the colorimetric test, the average value of ∆E was still below 4, thus, rabbit skin glue is still safe to be used in conservation. In the case of beeswax, the mixture of beeswax with olive oil proved to be superior to the mixture of beeswax with turpentine, as it produced a more even, glossy coating, and provided better protection against moisture and prevented mold growth more effectively. XRF analysis of the tin inscriptions revealed that the main composition of the inscriptions was tin (Sn) with the highest content of 93,145% in inscription D, while lead (Pb) was found with the highest content of 21,755% in inscription A. Overall, this study shows that natural materials such as rabbit skin glue and beeswax have good potential in artifact conservation applications, providing a safer and more effective alternative compared to synthetic materials, especially in maintaining the authenticity and durability of artifacts against damaging environmental influences.
Molecular Modeling of An Analog Of Curcumin Compounds Pentagamavunon-0 (PGV-0) And Pentagamavunon-1 (PGV-1) Through Computational Chemistry Methods Ab-Initio HF/4-31G Prakoso, Nurcahyo Iman; Hakim, Lukman; Hidayati, Nuri
INDONESIAN JOURNAL OF CHEMICAL RESEARCH VOLUME 2, ISSUE 1-2, 2017
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1474.984 KB) | DOI: 10.20885/ijcr.vol2.iss1.art4

Abstract

Breast cancer is the second largest number of cancer cases in Indonesia, after cervical cancer. The growth of these cancer cells can be prevented with compounds Pentagamavunon-0 (PGV-0) and Pentagamavunon-1 (PGV-1). This compound is an analog of curcumin compounds that have anti breast cancer activity. Modeling the structure of compound PGV-0 and PGV-1 through computational chemistry methods Ab-initio HF/4-31G could be used to predict the geometry and structure elucidation spectra associated with pharmacological activity such as anticancer compounds theoretically.This research involves modeling the structures and spectra prediction calculation compounds PGV-0 and PGV-1 by computational chemistry methods Ab-initio HF/4-31G, using Gaussian03W. The result using Ab-initio HF/4-31G method then compared with data from experimental geometry and the results of calculations with AM1.The results showed that computational chemistry methods Ab-initio HF/4-31G calculations give better results for modeling the structure compared semiempirik method AM1.
Application of Lignin as Adsorbent for Silver (Ag) and Copper (Cu) on Electroplating Waste in Kota Gede Prakoso, Nurcahyo Iman
INDONESIAN JOURNAL OF CHEMICAL RESEARCH VOLUME 3, ISSUE 1, 2018
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.013 KB) | DOI: 10.20885/ijcr.vol3.iss1.art1

Abstract

Lignin was a component of wood and always eliminated by chemical processing in many industries. On the other hand, oil palm bunches were the waste of palm oil industry, where that also containing high lignin.This study used lignin from residual waste of palm oil industry as biomass to adsorb silver (Ag) and copper (Cu) metal that is contained in electroplating waste by looking at lignin mass ratio, temperature and time in order to obtain optimal adsorption condition. The mass variations used were 100 mg, 200 mg, 300 mg, 400 mg, and 500 mg. While for the variation of contact time were 2 hours, 3 hours, 4 hours, 5 hours, 6 hours. For temperature variations were 30 °C, 40 °C, 50 °C,   and  60 °C.The results showed that the most optimal lignin mass ratio in adsorbing silver and copper metals was 200 mg/ 50 mL. While the most optimal contact time were 4 hours for Ag and 2 hours for Cu. For the most optimum temperature in adsorbing Ag metal at 50 °C and for Cu metal at 30 °C.
Temperature Effects on Growth and Culture Stability of Chlorella sp. in Laboratory Cultivation Anggraini, Winda Trisna; Santoso, Ruth Suci Wadini; Saputri, Wulandari Prasetya; Prakoso, Nurcahyo Iman; Utami, Maisari; Sasongko, Setyo Yanus; Purwiandono, Gani
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 11 No. 1 (2026): Volume 11, ISSUE 1, 2026
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol11.iss1.art5

Abstract

The growth behavior of chlorella sp. was evaluated under different temperature conditions to examine how thermal variation influences microalgal biomass production and culture dynamics. Cultivation experiments were conducted at 28, 35, and 40°C under continuous illumination with aeration. Biomass accumulation was monitored through optical density measurements at 680 nm, while physicochemical parameters including pH and total dissolved solids (TDS) were recorded throughout cultivation. Stable biomass accumulation was observed at 28°C, whereas growth became less consistent at 35°C and declined at 40°C, indicating increasing thermal stress at higher temperatures. Variations in pH and TDS during cultivation supported the observed temperature-dependent metabolic response. The analytical workflow used to monitor microalgal growth was further evaluated using the AGREE metric based on the principles of Green Analytical Chemistry. The estimated AGREE score of approximately 0.76 indicates a moderately green analytical procedure. The results highlight the importance of temperature control in maintaining stable microalgal cultivation and demonstrate the potential of integrating environmental performance assessment into microalgal growth studies.
Co-Authors Alifia Tia , Aulia Anggraini, Winda Trisna Gani Purwiandono, Gani Lukman Hakim Nuri Hidayati Ria Diar Stya, Primastiti Santoso, Ruth Suci Wadini Saputri, Wulandari Prasetya Sasongko, Setyo Yanus Utami, Maisari