Article Per Year (5 Year)
p-Index From 2021 - 2026
0.778
P-Index
This Author published in this journals
All Journal IPTEK The Journal of Engineering Eksergi: Chemical Engineering Journal Seminar Nasional Teknik Kimia Kejuangan
Syafira, Nesha Permata
Unknown Affiliation
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Sintesis dan Karakterisasi Hidroksiapatit Cangkang Rajungan dengan Variasi Suhu Kalsinasi dan Konsentasi KH2PO4 menggunakan Metode Presipitasi Sebagai Sediaan Biomaterial Implan Tulang Romadhona, Novelia Gita; Syafira, Nesha Permata; Gumelar, Tobing; Rizqiyah, Vita Fatichah; Ningrum, Eva Oktavia
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

Bone implants are mostly made of non-degradable metal materials that are toxic to the body. An alternative biodegradable material being developed is Poly-L-Lactic Acid (PLLA). However, PLLA has the disadvantage of being incompatible with bone tissue. So, materials that are biodegradable and biocompatible are needed, such as hydroxyapatite, which has similarities with the minerals in bone and teeth, it suitable as an alternative biomaterial in the biomedical. This research aims to determine the effect of synthesis conditions, with calcination temperature (850, 900, 950, 1000°C) and KH2PO4 concentration (0.25, 0.5, 0.75, 1 M), on the production of hydroxyapatite using raw materials from local blue crab shells, in terms of calcium content, functional group presence, and conformity of hydroxyapatite peaks with JCPDS 09-0432. The synthesized product was characterized using XRF, which showed a relatively high calcium in crab shells of 94.89% at calcination temperature 850°C. The FTIR test results after the mixing of KH2PO4 with CaO showed the formation of hydroxyapatite functional groups, namely OH- and PO43-, in all variables. The XRD test results showed that at 850°C and KH2PO4 concentration of 0.75 M the main peak of hydroxyapatite was closest to JCPDS 09-0432, at a diffraction angle (2θ) of 31.7634.
Green Extraction of Microcrystalline Cellulose from Cabbage Waste (Brassica Oleracea L.) via Steam Explosion Under Pressurized and Non-Pressurized Nitrogen (N2) Syafira, Nesha Permata; Airlangga, Bramantyo; Sumarno
Eksergi Vol 22 No 2 (2025)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i2.14826

Abstract

Agricultural residues such as cabbage waste (Brassica oleracea L.) are rich in cellulose and offer promising potential for sustainable microcrystalline cellulose (MCC) production. This study aims to extract and characterize MCC from cabbage waste using an environmentally friendly approach that combines high-speed blending, low-concentration oxalic acid hydrolysis (0–2% w/v), and steam explosion at 130 °C for 15 minutes, under both pressurized and non-pressurized nitrogen (N₂) atmospheres. The application of pressurized N₂ significantly improved delignification efficiency and preserved cellulose crystallinity. The optimal treatment (2% oxalic acid with N₂) yielded a cellulose content of 79.18%, with hemicellulose and lignin contents reduced to 15.28% and 0.10%, respectively. FTIR analysis confirmed the effective removal of non-cellulosic components, while XRD analysis revealed a crystallinity index 66%, which is high compared to typical MCC values from other biowastes (~50–60%). SEM revealed clean and well-dispersed fiber morphology. These results indicate that oxalic acid combined with N₂-assisted steam explosion is an effective and eco-friendly method for producing MCC. This approach minimizes chemical use and oxidation, making it suitable for pharmaceutical excipients, biodegradable composites, and other green material applications. Overall, the process aligns with circular economy principles and contributes to the Sustainable Development Goals (SDGs).
Sintesis dan Karakterisasi Hidroksiapatit Cangkang Rajungan dengan Variasi Suhu Kalsinasi dan Konsentasi KH2PO4 menggunakan Metode Presipitasi Sebagai Sediaan Biomaterial Implan Tulang Romadhona, Novelia Gita; Syafira, Nesha Permata; Gumelar, Tobing; Rizqiyah, Vita Fatichah; Ningrum, Eva Oktavia
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

Bone implants are mostly made of non-degradable metal materials that are toxic to the body. An alternative biodegradable material being developed is Poly-L-Lactic Acid (PLLA). However, PLLA has the disadvantage of being incompatible with bone tissue. So, materials that are biodegradable and biocompatible are needed, such as hydroxyapatite, which has similarities with the minerals in bone and teeth, it suitable as an alternative biomaterial in the biomedical. This research aims to determine the effect of synthesis conditions, with calcination temperature (850, 900, 950, 1000°C) and KH2PO4 concentration (0.25, 0.5, 0.75, 1 M), on the production of hydroxyapatite using raw materials from local blue crab shells, in terms of calcium content, functional group presence, and conformity of hydroxyapatite peaks with JCPDS 09-0432. The synthesized product was characterized using XRF, which showed a relatively high calcium in crab shells of 94.89% at calcination temperature 850°C. The FTIR test results after the mixing of KH2PO4 with CaO showed the formation of hydroxyapatite functional groups, namely OH- and PO43-, in all variables. The XRD test results showed that at 850°C and KH2PO4 concentration of 0.75 M the main peak of hydroxyapatite was closest to JCPDS 09-0432, at a diffraction angle (2θ) of 31.7634.
Green Synthesis of Microcrystalline Cellulose from Cabbage Waste (Brassica Oleracea L.) Using Steam Explosion and Low-Concentration Chemical Treatment Syafira, Nesha Permata; Airlangga, Bramantyo; Sumarno
IPTEK The Journal of Engineering Vol. 11 No. 2 (2025)
Publisher : Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember.

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

Abstract

The increasing generation of agricultural waste presents both environmental challenges and opportunities for the development of sustainable materials. This study explores the extraction of microcrystalline cellulose (MCC) from cabbage waste using a combination of steam explosion and low-concentration chemical treatments to optimize lignocellulose degradation. The process involved sequential delignification with NaOH, bleaching with NaOCl, and steam explosion applied to samples that had been soaked in oxalic acid at varying concentrations (0%–2%). After drying, the samples were analyzed using FTIR, XRD, and SEM to evaluate the extracted MCC product. The analytical results showed that the applied method significantly increased cellulose purity, from 31.05% in untreated fibers to 69.88% after steam explosion following soaking in 2% oxalic acid. FTIR analysis confirmed the removal of lignin and hemicellulose, while XRD analysis indicated an increase in crystallinity from 39% to 57%, suggesting improved structural integrity. SEM analysis revealed enhanced fiber separation and reduced particle size, indicating efficient defibrillation. These results highlight the potential of an environmentally friendly approach to producing high-quality MCC, supporting green chemistry principles and sustainable development goals (SDGs). eThe extracted MCC holds promising applications, particularly as a biopolymer for drug delivery systems, polymer composites, and food additives.
Co-Authors Airlangga, Bramantyo Gumelar, Tobing Rizqiyah, Vita Fatichah Romadhona, Novelia Gita Sumarno