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All Journal Jurnal Hortikultura Indonesia (JHI) CHEMICA Jurnal Teknik Kimia Seminar Nasional Teknik Kimia Kejuangan REKAYASA Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat Kultivasi Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Teknologi Jurnal Pemberdayaan: Publikasi Hasil Pengabdian Kepada Masyarakat PRIMA: Journal of Community Empowering and Services Agro Sintesa : Jurnal Ilmu Budidaya Pertanian Formosa Journal of Applied Sciences (FJAS) Jurnal Pengelolaan Perkebunan (JPP) Jurnal Rekayasa Proses
Saputri, Lestari Hetalesi
Politeknik LPP Yogyakarta
Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Physics Social Sciences Other

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The Effects of the Blending Condition on the Morphology, Crystallinity, and Thermal Stability of Cellulose Microfibers Obtained from Bagasse Romi Sukmawan; Lestari Hetalesi Saputri; Rochmadi Rochmadi; Heru Santoso Budi Rochardjo
Indonesian Journal of Chemistry Vol 19, No 1 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.284 KB) | DOI: 10.22146/ijc.31051

Abstract

In this study, cellulose microfibers were isolated from bagasse fibers in three stages. Initially, the fibers were treated with 5 wt.% NaOH solution followed by bleaching with 5 wt.% H2O2 in an alkali condition (pH 11) to remove hemicelluloses and lignin. Whole cellulosic fibers were obtained by mechanically separating the fibers using a modified kitchen blender to produce cellulose microfibers. Morphological (Scanning Electron Microscopy (SEM)) and structural analysis of the treated fiber was performed using Fourier Transformed Infrared (FTIR) spectroscopy and X-ray Diffraction (XRD). Morphological characterization identified that the diameter of the fibers varied between 20 nm to 20 µm and the FTIR analysis demonstrated that the treatments resulted in the gradual removal of lignin and hemicelluloses from the fiber. Furthermore, the XRD studies revealed that the combination of the chemical and mechanical treatment is an effective way to increase purity of cellulose (removal of amorphous lignin and hemicellulose) and break down the microfiber into shorter crystalline parts with higher crystallinity (77.25%) than raw bagasse (40.54%). Accordingly, changing the agitation time revealed that the cellulose crystallite size in the sample varied slightly with agitation time by using a blender (3.35 nm). Finally, the higher crystallinity and crystallite size improved the thermal stability of the cellulose microfiber confirming their suitability in the manufacturing biomaterial composites.
Optimalisasi Lahan Pekarangan dengan Budidaya Tanaman Sayuran sebagai Salah Satu Alternatif dalam Mencapai Strategi Kemandirian Pangan Rina Ekawati; Lestari Hetalesi Saputri; Anna Kusumawati; Luci Paonganan; Pantja Siwi V R Ingesti
PRIMA: Journal of Community Empowering and Services Vol 5, No 1 (2021): June
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/prima.v5i1.42397

Abstract

Lahan pekarangan dapat menjadi salah satu alternatif sebagai lahan budidaya untuk memenuhi kebutuhan pangan rumah tangga, terutama tanaman sayuran. Tujuan kegiatan pengabdian ini adalah untuk memberikan pengetahuan kepada ibu-ibu anggota Kelompok Wanita Tani (KWT) Dusun Danen, Kelurahan Sumberadi, Kecamatan Mlati, Kabupaten Sleman, Provinsi Daerah Istimewa Yogyakarta tentang: (1) Pemilihan jenis media tanam yang tepat; (2) Kandungan nutrisi dalam sayuran; (3) Tahapan budidaya sayuran dalam polybag; (4) Manajemen kelompok tani; dan (5) Penghematan anggaran belanja rumah tangga dengan adanya budidaya sayuran di pekarangan rumah sendiri. Kegiatan pengabdian ini dilaksanakan pada tanggal 19 Januari 2020 dalam bentuk sosialisasi disertai dengan diskusi/tanya jawab, praktik budidaya dan evaluasi yang dilaksanakan dengan melibatkan 16 peserta. Evaluasi dilakukan tiga minggu setelah kegiatan dengan hasil yang menunjukkan bahwa peserta kegiatan sosialisasi dan penyuluhan telah mengetahui dengan baik kegiatan budidaya tanaman sayuran daun dan buah serta pemeliharaannya. Tanaman selada, paprika, cabai rawit, cabai merah, dan terung yang dibudidayakan telah tumbuh dengan baik hingga berumur 3 minggu setelah tanam (MST) ketika dilakukan evaluasi. Jika pemenuhan kebutuhan sayur rumah tangga dari pekarangan rumah 25%, maka potensi penghematan belanja rumah tangga sekitar Rp 3.000,00 per hari.
Evaluasi Kinerja Stasiun Penguapan Ditinjau dari Efisiensi Penggunaan Uap di PT. PG Rajawali II, Unit PG. Sindang Laut Cirebon Rika Wulandari; Lestari Hetalesi Saputri
Jurnal Pengelolaan Perkebunan (JPP) Vol. 2 No. 2: September 2021
Publisher : Politeknik LPP Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54387/jpp.v1i1.2

Abstract

The evaporation station has an important role in the sugar factory. This station aims to concentrate the sugar solution until it reaches its saturation point (± 60% Brix), so that the process of forming sugar crystals at the cooking station becomes easier. However, the evaporation station also contributes to the highest sucrose inversion compared other stations. Sugar solution (sucrose) is resistant to high temperatures, long periods of time, and low pH. Therefore, it is necessary to evaluate the evaporation station. To reduce the risk of sucrose inversion in the evaporation station, the sugar solution is heated in a pressure vessel (vacuum). Vacuum conditions can lower the boiling point of juice. Performance evaluation of evaporation station is measured by the total temperature drop (ΣΔT). The temperature drop is influenced by the distribution of pressure and temperature in evaporation, as well as the evaporation rate. The values of the parameters are compared with the literatures. The standard for the value of ΣΔT is 40, while the standard evaporation rate for the quadruple effect evaporation system with bleeding is 26 kg/(m2.hour). The results of the evaluation show that the highest ΣΔT value is 40.96 and the evaporation rate is 24.5 kg/(m2.hour), so it can be concluded that the operational condition of the evaporation station at PG Sindang Laut Cirebon is quite good. The evaporation system is also quite efficient. However, the evaporation rate is still categorized as inefficient
Comparison of Fiber Characteristics of Empthy Fruit Bunches (EFB) after Steaming and Boiling Treatment in Pulp Synthesis Lestari Hetalesi Saputri; Muhammad Hafiz; Muhammad Fadli
Formosa Journal of Applied Sciences Vol. 2 No. 1 (2023): January, 2023
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjas.v2i1.2519

Abstract

Empthy Fruit Bunches (EFB) is biomass from Palm Oil Mills with high cellulose content. Cellulose can be used for the manufacture of coatings, clothing fibers, bioplastics, papers and membranes. Obtaining pure cellulose for these products generally is begun with the stages of removing the following impurities, through steaming or boiling. This study aims to compare the characteristics of the EFB fiber from the two processes. Comparisons were made by steaming and boiling EFB fiber at 80℃ for 30, 60, 90 and 120 minutes. The fibers was tested for water absorption, density and tensile strength. The test results showed that the boiling process produced brighter colored fibers, tensile strength and water absorption were also better with values of 107.40 kgf/cm2 and 62.46%. Meanwhile, for the density value is is the same for each variation.
Pengaruh Waktu dan Suhu Penyimpanan Kompon Karet terhadap Karakteristik Vulkanisasi Muh. Wahyu Syabani; Suharyanto Suharyanto; Mertza Fitra Agustian; Lestari Hetalesi Saputri
Jurnal Teknologi Vol 10, No 2 (2023): Jurnal Teknologi
Publisher : Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31479/jtek.v10i2.223

Abstract

A rubber compound is an intermediate product resulting from mixing rubber with other additives before being molded through a vulcanization process. Frequently, there is a delay between the compounding process and vulcanization, therefore proper storage procedures must be prepared. The presence of a vulcanizing agent, activator, and accelerator in the compound allows the vulcanization reaction to occur during the storage period. This study aims to analyze the effect of the storage time and temperature of rubber compounds on rubber vulcanization characteristics. The rubber compound is stored at room temperatures of 25oC and 32oC. On the 1st, 3rd, and 5th day of storage, the compounds were tested using a rheometer to obtain vulcanization parameter data. The values of MH, ML, ts2, tc90, cure rate index (CRI), and effective torque of each treatment were studied. The results showed that the storage time of the compound affected each of the observed parameters. In the range of 5 days, the longer time indicates the formation of polysulfide crosslinks in the rubber polymer chain network. Higher storage temperature also faster reaction rate during storage. The increasing number of cross-links resulting a longer induction period dan vulcanization time, lower CRI, and effective torque.
Utilization of Aur-Aur Grass as A Natural Hand Sanitizer in Order To Prevent The Spread of The Covid-19 Virus Amutya, Adilla Lina Putri; Rifa'i, Alfian Zilham; Prasetiyo, Yogi; Sari, Arum; Saputri, Lestari Hetalesi
Indonesian Journal of Chemical Research Vol 9 No 3 (2022): Edition for January 2022
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2022.9-sap

Abstract

Indonesia is currently amid a Covid-19 virus pandemic. One of the efforts that can be done to prevent the spread of the Covid-19 virus is to wash your hands with soap, or you can use a hand sanitizer. However, hand sanitizers are mostly made of chemicals, many people feel side effects including dry skin, dermatitis, and irritation. This research aims to make hand sanitizer products made from natural ingredients, namely from extracts of aur-aur grass (Commelina diffusa Burm F.). Phytochemical tests showed that aur-aur grass contained 5,188.73 ppm flavonoid compounds, 8,673.60 ppm total phenol (tannin), and 466.30 ppm alkaloids. The manufacture of hand sanitizers was carried out in four variations with each sample having aur-aur extract levels of 5%, 10%, 15%, and 20%. Of the existing hand sanitizer products, all of them have a pH of ±5 and get good responses from satisfaction values ​​above 80%. Hand sanitizer products also can inhibit bacterial growth. The increase in extract levels in the hand sanitizer is directly proportional to the ability to inhibit bacteria, as shown by sample D which has an average inhibition zone of 9.77 mm.
Budidaya Tanaman Hortikultura dan Lumbung Pangan dalam Upaya Pemanfaatan Lahan Pekarangan di Kelurahan Klitren Yogyakarta Galuh Banowati; Rina Ekawati; Lestari Hetalesi Saputri; Hartini Hartini; Ratna Sri Harjanti; Retno Muningsih
Agrokreatif: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 10 No. 1 (2024): Agrokreatif Jurnal Ilmiah Pengabdian Kepada Masyarakat
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrokreatif.10.1.23-32

Abstract

One of the characteristics of urban areas is the increasingly limited land that can be used for plant cultivation. Only now, a lot of yard land has yet to be utilized optimally, especially for cultivating vegetables. Klitren Village, in the center of Yogyakarta City, has community-owned yard land that can be used even though the area is limited. This service activity aims to maximize the use of yard land for cultivating vegetable plants, herbal gardens, and food storage. This service activity was carried out in Klitren Village at the Asoka Farming Women's Group (FWG) in July 2022. The service activity was attended by 81 people who were a combination of women members of Asoka's FWG, the Village Head of Klitren Village, Village Agricultural Extension Officers, Lecturers, Students, Research and Community Service Units, and the Klitren Village community from various. The service is carried out through several activities, including making planting media for cultivating vegetable plants, arranging herbal gardens, and providing food barns. 100% of the evaluation results stated that the activity participants knew how to make planting media and food storage. In comparison, 66.7% said they knew how to organize and maintain an herbal garden. 66.7% of the participant's responses to the activities indicated that they were helpful and hoped they could be sustainable and improved.
The Effect of Different Shading Level on Growth and Plant Biomass Character of Dayak Union (Eleutherine palmifolia (L.) Merr) Rina Ekawati; Lestari Hetalesi Saputri
Jurnal Hortikultura Indonesia (JHI) Vol 11 No 3 (2020): Jurnal Hortikultura Indonesia
Publisher : Indonesian Society for Horticulture / Department of Agronomy and Horticulture

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jhi.11.3.221-230

Abstract

This study aimed to determine the effect of different shading levels on the growth and plant biomass character of Dayak onion. This research was conducted in Sukoharjo village, Ngaglik, Sleman, Yogyakarta from May until September 2020 (5 months). This experiment used a single factor treatment in randomized block design with three different shade levels, namely no shade (0%), 55% and 75% of paranet shade. The treatment was repeated five times so that there were 15 experimental units. Each experimental unit consists of ten plants. The observations were on temperature and relative humidity, sprouting age, plant height, number of leaves, leaf area, and plant biomass components. The results showed that the given of 55% and 75% produced the higher of plant height and leaf area than no shade. Seventy percent shade gave 37.1% higher plant height, while 55% shade gave 41.6% wider leaf area than no shade. The number of leaves and plant biomass components was not affected by shade. Dayak onion can be planted in the land with 55 – 75% shade. Keywords: Eleutherine palmifolia, low light intensity, performance, temperature
Potensi senyawa polifenol dalam ekstrak daun kelapa sawit untuk produk gel sunscreen alami Sujaka, Romi; Siregar, Bimas Satrio; Saputri, Lestari Hetalesi
Jurnal Rekayasa Proses Vol 19 No 1 (2025): Volume 19, Number 1, 2025
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.19469

Abstract

The bad effects of exposure to sunlights through the content of UltraViolet A (UVA) and UltraViolet B (UVB) in the long term can cause skin damage. One way of protection is through the using of sunscreen. This study aims to make a gel sunscreen from natural ingredients, polyphenolic compounds from oil palm leaf extract. The use of natural sunscreens has the advantage of the safety level of use when compared to synthetic sunscreens. The process of making sunscreen consists of several stages, namely raw material preparation (separating the leaves from the palm fornds, chopping, washing, and drying the palm leaves), extraction palm leaf by the maceration method (soaking and stirring powdered plam leaf with ethanol 96%) and making gel preparations by mixing palm leaf extract with methylparaben and a gel base, namely Hydroxy Propyl Methyl Cellulose (HPMC) and Carbopol. After the gel is made, the preparation is tested to obtain a sunscreen formulation that complies with SNI No 16-4399-1996. From the test results, several standard formulations were obtained, namely pH, spreadability, emulsion stability, antioxidant, viscosity, and SPF parameters. The best sunscreen gel product is the F2 (comparison of HPMC and Carbopol 70% : 30%) with a concentration of 1% palm leaf extract.
Pemanfaatan tandan kosong kelapa sawit dari produksi pabrik kelapa sawit Cikasungka sebagai alternatif pembuatan tinta printer Gunawan, Dandi Syahrul; Pardosi, Ridho; Widodo, Timbul; Iqbal, Muhammad; Africia, Nabillah Dwi; Sandi, Aris; Saputri, Lestari Hetalesi
Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.15659

Abstract

Tandan Kosong Kelapa Sawit (TKKS) merupakan limbah organik yang sangat banyak dijumpai diperkebunan kelapa sawit. TKKS memiliki nilai guna yang cukup tinggi karena terdapat kandungan serat di dalamnya. Namun, pemanfaatan TKKS di Pabrik Kelapa Sawit (PKS) masih sebatas sebagai pupuk. Oleh karena itu, pada riset ini dilakukan pemanfaatan kelapa sawit sebagai bahan baku pigmen organik untuk pembuatan tinta printer. Pigmen organik pada riset ini dibuat melalui beberapa tahapan, antara lain penghalusan bahan dengan parang, pengeringan dengan sinar matahari, proses karbonisasi (pengarangan) pada suhu 450oC menggunakan serangkaian alat karbonisasi, penghalusan arang (karbon) TKKS, pengayakan serbuk karbon dengan screen mesh T200 dan tahap pembuatan tinta printer dilakukan melalui pencampuran karbon TKKS dengan aquadest, alkohol, dan gum arab. Tinta yang dihasilkan akan diuji viskositas, uji transmitansi cahaya, uji adhesi, uji densitas, dan uji performa tinta. Hasil riset ini menunjukkan bahwa produk tinta printer terbaik didapatkan pada komposisi massa 2 g karbon dengan 5 mL alkohol, yang dicampur dengan bahan perekat berupa 3,5 g gum arab dalam 22,5 mL aquadest. Hasil uji cetak, transmitansi dan adhesi telah sesuai dengan Standar Nasional Indonesia (SNI) namun untuk uji viskositas perlu diteliti lebih lanjut.
Co-Authors Africia, Nabillah Dwi Ahmad Fauzi Amutya, Adilla Lina Putri Anna Kusumawati Arum Sari Budhijanto Budhijanto Budhijanto Budhijanto Budhijanto, Budhijanto Ekawati, Rina Galuh Banowati Gunawan, Dandi Syahrul Hartini Hartini Heru Santoso Budi Rochardjo Luci Paonganan Mertza Fitra Agustian Muh. Wahyu Syabani Muhammad Fadli Muhammad Hafiz Muhammad Iqbal Pantja Siwi VR Ingesti Pardosi, Ridho Prasetiyo, Yogi Ratna Sri Harjanti Retno Muningsih Rifa'i, Alfian Zilham Rika Wulandari Rika Wulandari Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi, Rochmadi Romi Sukmawan Sandi, Aris Siregar, Bimas Satrio Suharyanto Suharyanto Sujaka, Romi Widodo, Timbul