Article Per Year (5 Year)
p-Index From 2021 - 2026
0.659
P-Index
This Author published in this journals
All Journal Menara Perkebunan
Firda Dimawarnita
Indonesian Oil Palm Research Institute
Agriculture, Biological Sciences & Forestry

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Stability of B50 biodiesel added with glycerol ester additive based on palm oil oleic acid: Firda Dimawarnita; Yora Faramitha; Erliza Hambali
Menara Perkebunan Vol. 91 No. 1 (2023): 91 (1), 2023
Publisher : INDONESIAN OIL PALM RESEARCH INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iribb.jur.mp.v91i1.526

Abstract

Biodiesel in Indonesia is a mixture of Fatty Acid Methyl Ester (FAME) and diesel oil. Mixing FAME and diesel oil is challenging since FAME is separated from diesel oil at low temperatures. Changes in the physico-chemical properties of biodiesel during storage decrease biodiesel quality due to dissolved oxygen, potentially damaging the engine. Using glycerol ester (GE) as an additive can be an alternative solution to tackle that problem. This research examined the stability of GE-added biodiesel. As a comparison, commercial diethyl ether (DEE) additive was used. The concentration of additive added to biodiesel varied at 1000, 2000, and 3000 ppm while the storage temperature varied at 12, 25, and 42℃. The stability of biodiesel was evaluated for three months by measuring the acid value, viscosity, corrosion rate, and water content. The acid values ​​​​of the various types and concentrations of additives still meet the SNI 7182-2015 standard (0.5 mg KOH g-1 sample) with a value range of 0.148-  0.392 mg KOH g-1 sample. Kinematic viscosity had a value range of 3.12-3.58 cst, which also meets the SNI 7182-2015 standard (2.3-6 cst). The highest corrosion rate for GE and DEE was in the first week, with values of 0.447 and 0.261 mpy, respectively. Both B50 biodiesel control and the addition of 1000 ppm GE had the same water content value on the 18th day, which was 0.046%, and this value was considered the highest water content. This means adding an additive can maintain the water content in B50 biodiesel. Overall, GE additives in B50 biodiesel with various concentrations comply with SNI 7182-2015 standard.
Extraction and characterization of fulvic acid from oil palm empty fruit bunches Firda Dimawarnita; Khairy Yunda Maharani; Sutanto Sutanto; Yora Faramitha; Donny Nugraha Kalbuadi; Didiek Hadjar Goenadi
E-Journal Menara Perkebunan Vol. 93 No. 2 (2025): 93(2), 2025
Publisher : INDONESIAN RESEARCH INSTITUTE FOR BIOTECHNOLOGY AND BIOINDUSTRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iribb.jur.mp.v93i2.669

Abstract

Oil palm empty fruit bunches (OPEFB) contain 27.78% lignin, which can serve as an alternative source of renewable fulvic acid, alongside soil and coal. This study aims to conduct the fulvic acid extraction process using a microwave extractor. The extraction process was carried out using H2O2 solvents with concentrations of 18, 21, and 24% and various sample types (OPEFB, shilajit, and commercial fulvic acid fertilizer), with three repetitions. The resulting liquid fulvic acid extract was then made into powder using freeze-drying. Quantitative testing was conducted using the spectrophotometric method, while qualitative testing employed Fourier-Transform Infrared Spectroscopy (FTIR), Proton Nuclear Magnetic Resonance (¹H NMR), spectrofluorometry, a CHN analyzer, and Thermogravimetric Analysis - Differential Scanning Calorimetry (TGA-DSC). The results showed that the best solvent concentration for the fulvic acid extraction process was H2O2, 21% of the total in the OPEFB sample. The highest fulvic acid content was found in the OPEFB sample at 23.59%; in the shilajit sample, it was 9.62%, and in the commercial fulvic acid fertilizer sample, it was 6.97%. The characterization results from spectrophotometric analysis, elemental analysis, and TGA-DSC analysis showed the potential of fulvic acid in the OPEFB sample, as it exhibited similarities with the analysis results of commercial fulvic acid (shilajit & commercial fulvic acid fertilizer).
The Impact of Pasteurization on Tetracycline Residues, Physicochemical, Microbiological, and Antioxidant Properties of Acacia Honey Fuad Al Farisi; Lilik Eka Radiati; Abdul Manab; Fitri Amalia; Woro Dyah Pinilih; Metrizal Metrizal; Firda Dimawarnita
E-Journal Menara Perkebunan Vol. 94 No. 1 (2026): 94(1), 2026
Publisher : INDONESIAN RESEARCH INSTITUTE FOR BIOTECHNOLOGY AND BIOINDUSTRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iribb.jur.mp.v94i1.704

Abstract

Honey is recognized for its high nutritional and functional value, yet it remains vulnerable to contamination by antibiotic residues such as tetracycline when beekeeping practices are not properly managed. Post-harvest pasteurization is widely utilized to improve honey safety and quality. This study examined the effects of pasteurizing honey at 60°C for 10, 20, or 30 minutes on tetracycline and oxytetracycline residue levels, as well as on the physicochemical, microbiological, and antioxidant properties of acacia honey (Apis mellifera). Honey samples were artificially contaminated with antibiotics at 1 µg/g and analyzed using high-performance liquid chromatography (HPLC). Pasteurization at 60°C reduced oxytetracycline residues by approximately 33% (P<0.01). Pasteurization also decreased moisture content and diastase enzyme activity, while acidity increased with longer heating durations. Hydroxymethylfurfural levels remained very low (<1 mg/kg), indicating minimal thermal damage. Reducing sugar and sucrose levels were largely unchanged, total plate count (TPC) decreased slightly but not significantly, and yeasts and molds were undetectable after 10 minutes of pasteurization. Antioxidant activity showed a slight, non-significant reduction, whereas flavonoid content declined substantially due to heat exposure. In summary, pasteurization at 60°C effectively reduces antibiotic residues and microbial presence in honey, but also affects certain quality parameters, particularly diastase enzyme activity, acidity, and flavonoid content.
Co-Authors Abdul Manab Didiek Hadjar Goenadi Donny Nugraha Kalbuadi Erliza Hambali Fitri Amalia Fuad Al Farisi Khairy Yunda Maharani Lilik Eka Radiati Metrizal Metrizal Sutanto Sutanto Woro Dyah Pinilih Yora Faramitha