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Endah Sayekti
Jurusan Kimia FMIPA Universitas Tanjungpura
Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Pelatihan Pembuatan Tas Berbahan Dasar Sampah Plastik Sebagai Upaya Penerapan 3R pada Kelompok Sadar Wisata Teluk Majantu, Kelurahan Sedau, Singkawang Zahara, Titin Anita; Shofiyani, Anis; Sayekti, Endah; Gusrizal, Gusrizal; Alimuddin, Andi Hairil; Sapar, Ajuk; Rudiyansyah, Rudiyansyah; Wibowo, Muhamad Agus; Usman, Thamrin; Wahyuni, Nelly; Nofiani, Risa; Widiyantoro, Ari; Rahmalia, Winda; Rahayu, Warsi Kurnia
Abdimas Galuh Vol 6, No 1 (2024): Maret 2024
Publisher : Universitas Galuh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25157/ag.v6i1.12701

Abstract

Kegiatan pelatihan pembuatan tas goodie bags pada Kelompok Sadar Wisata (POKDARWIS) di Desa Teluk Makjantu bertujuan untuk memberikan pemahaman kepada POKDARWIS untuk menjaga lingkungan dengan melakukan pengelolaan sampah 3R. Sampah pelastik dipilih karena pemakaian kantong pelastik yang sudah menjadi barang yang tidak terpisahkan dari kehidupan manusia serta memiliki sifat yang sulit terdegradasi (nonbiodegradable) di lingkungan. Goodie bags berbahan dasar limbah pelastik diharapkan dapat menjadi wadah penyimpanan souvenir bagi POKDARWIS Desa Makjantu dalam melayani wisatawan. Pelatihan ini dilakukan dengan menyajikan teori dan praktek pembuatan goodie bags secara langsung, diharapkan masyarakat POKDARWIS dapat melakukan pengelolaan sampah dengan konsep 3R dan dapat membuat goodie bags dari limbah pelastik sebagai upaya pelestarian dan pengelolaan lingkungan. Pelatihan ini juga memberikan dampak terhadap keterampilan peserta dalam mengelola limbah pelastik menjadi barang yang dapat dimanfaatkan. Dengan demikian, program mengelolaan sampah dengan metode 3R dapat diterapkan. Melihat kondisi dan antusias peserta dapat dikatakan bahwa kegiatan ini sangat memberikan dampak positif bagi masyarakat Desa Teluk Majantu untuk  mendukung kegiatan pariwisata dalam hal pengelolaan sampah pelastik dengan tingkat kebermanfaatan dan keberlangsungannya sebesar 90%
PELATIHAN PEMBUATAN KOMPOS DARI LIMBAH DAUN KERING PADA ANGGOTA KOPERASI KONSUMEN PADAIDI SIPATUO KHATULISTIWA Alimuddin, Andi Hairil; Sayekti, Endah; Shofiyani, Anis; Sapar, Ajuk; Rudiyansyah, Rudiyansyah; Gusrizal, Gusrizal; Zahara, Titin Anita; Wahyuni, Nelly
Abdimas Galuh Vol 5, No 2 (2023): September 2023
Publisher : Universitas Galuh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25157/ag.v5i2.11055

Abstract

Koperasi Konsumen Padaidi Sipatuo Khatulistiwa merupakan koperasi skala mikro yang bergerak di bidang  perdagangan eceran. Sebagai suatu koperasi yang baru berkembang dan merintis unit usaha, tentunya diperlukan suatu jenis usaha yang mudah, biaya murah dan dapat digunakan oleh berbagai lapisan masyarakat. Salah satu prospek usaha yang dapat dikembangkan adalah pembuatan pupuk kompos dari daun kering. Berdasarkan orientasi yang telah dilakukan oleh tim pengabdi dan konsultasi dengan pengurus koperasi, diperoleh informasi bahwa (1) kegiatan koperasi masih dalam bentuk usaha perdagangan, dan  (2) mayoritas anggota koperasi gemar bercocok tanam dan memiliki pekarangan untuk tanaman bunga dan buah-buahan. Solusi terhadap permasalahan koperasi yang ditawarkan tim pengabdi agar dapat menjadi unit usaha ataupun kegiatan usaha dari koperasi serta anggotanya yaitu pengolahan sampah daun kering menjadi pupuk kompos. Ketersediaan bahan baku yang mudah didapat, pengerjaan yang sangat sederhana, serta produk pupuk yang dihasilkan dapat digunakan sendiri atau dapat dijual melalui layanan koperasi. Dalam rangka transfer teknologi tepat guna dalam pembuatan pupuk kompos bagi anggota Koperasi Konsumen Padaidi Sipatuo Khatulistiwa maka metode pelaksanaan yang akan diterapkan dalam bentuk pelatihan yang diawali dengan (1) penyuluhan dan sosialisasi pemanfaatan dan pembuatan pupuk kompos, kemudian dilanjutkan dengan (2) praktek kompos dari daun kering. Tahapan kegiatan diawali dengan penyampaian materi dilanjutkan dengan praktek pembuatan kompos dari daun kering. Peserta pelatihan sangat antusias mengikuti kegiatan ini yang dapat dilihat dari banyaknya pertanyaan dan tingginya perhatian peserta dalam memperhatikan pemaparan tim pengabdi dan praktek pembuatan kompos.
Pengolahan Fraksi Solar Hasil Pirolisis Sampah Plastik Menggunakan Adsorben Zeolit Teraktivasi Asam Sulfat Wahyuni, Nelly; Sayekti, Endah; Syah, Nur Rikswan
Jurnal Teknologi Lingkungan Lahan Basah Vol 14, No 1 (2026): January 2026
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v14i1.94034

Abstract

Processing plastic waste, especially Low-Density Polyethylene (LDPE), is an environmental problem because it is difficult to decompose. One method of processing plastic waste is pyrolysis, which converts plastic into liquid fuels such as diesel. However, pyrolyzed diesel still contains impurities, such as sulfur, chlorine, and hydrocarbon compounds, which affect fuel quality, including acid number and viscosity. This study aims to determine the adsorbent characteristics of natural zeolite (ZA), chemically-physical activation zeolite (ZKF), and physico-chemical activation zeolite (ZFK), and to assess their effectiveness in improving the quality of diesel fuel from the pyrolysis of plastic waste. The test of zeolite as an adsorbent was conducted by measuring water and ash content and by characterizing it using Fourier Transform Infrared (FTIR), X-Ray Fluorescence (XRF), and a Gas Sorption Analyzer (GSA). FTIR results showed spectral changes indicative of the loss of OH groups and revealed the main functional groups of the activated zeolites. XRF results show that ZKF and ZFK have increased silica (SiO₂) content from 81.85% to 82.19% and 82.26%, and decreased iron oxide (Fe₂O₃) content from 0.94% to 0.63% and 0.62%. GSA analysis showed increases in the surface areas of ZKF and ZFK from 11.49 m²/g to 34.06 m²/g and 19.78 m²/g, respectively. Processing of pyrolyzed diesel using ZKF and ZFK showed a decrease in acid number from 1.03 mg NaOH/g to 0.25 mg NaOH/g and 0.20 mg NaOH/g, a reduction in viscosity from 5.45 cSt to 5.19 cSt and 5.13 cSt. The most effective adsorbent for reducing acid number and viscosity is ZFK, with a surface area of 19.78 m2/g, an average pore diameter of 5.99 nm, and optimal adsorption conditions at a stirring time of 4 minutes with an adsorbent mass of 1.5 grams in 50 mL of pyrolyzed diesel.
Implikasi Proses Pembelajaran secara Luring dan Daring terhadap IPK Mahasiswa FMIPA Universitas Tanjungpura Minsas, Sukal; P.W., Elvi Rusmiyanto; Sari, Reny Puspita; Sayekti, Endah; Hasanuddin; Muhardi; Imroah, Nurfitri; Yudhi; Ardiningsih, Puji; Nirmala, Irma
Arus Jurnal Psikologi dan Pendidikan Vol 5 No 1: Februari (2026)
Publisher : Arden Jaya Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57250/ajpp.v5i1.2355

Abstract

Studi ini bertujuan untuk menganalisis dampak proses pembelajaran daring dan luring terhadap kepuasan mahasiswa dan korelasinya dengan peningkatan Indeks Prestasi Kumulatif (IPK) di Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Tanjungpura. Metode survei diterapkan dengan menggunakan pengambilan sampel acak bert stratified, melibatkan 437 responden dari berbagai program studi. Instrumen penelitian diuji validitas dan reliabilitasnya, menghasilkan nilai alpha Cronbach sebesar 0,917, menunjukkan reliabilitas yang tinggi. Data dianalisis menggunakan skala Likert untuk mengukur kepuasan mahasiswa di berbagai aspek pelayanan akademik. Hasil penelitian menunjukkan bahwa kualitas pelayanan akademik termasuk dalam kategori baik–sangat baik, dengan skor interval rata-rata berkisar antara 3,01 hingga 3,43. Analisis IPK menunjukkan peningkatan yang signifikan pada pembelajaran daring (3,12–3,48) dan hibrida (3,37–3,42) dibandingkan dengan pembelajaran luring (3,09–3,18). Hasil ini menegaskan bahwa variasi metode pembelajaran memengaruhi prestasi akademik mahasiswa, sementara survei kepuasan memberikan dasar empiris untuk pembuatan kebijakan guna meningkatkan kualitas akademik di Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Tanjungpura.
EKSTRAKSI HIJAU SENYAWA BIOAKTIF DARI ALGA MERAH (Eucheuma cottoni) MENGGUNAKAN PELARUT EUTEKTIK DAN APLIKASINYA DALAM SEDIAAN LOSION Prayitno, Dwi; Rahmalia, Winda; Adhitiyawarman, Adhitiyawarman; Sayekti, Endah
Indonesian Journal of Pure and Applied Chemistry Vol 9, No 1 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i1.101282

Abstract

The need for environmentally responsible extraction techniques has driven the development of green alternatives to conventional organic solvents. Deep eutectic solvents (DESs) offer a sustainable option due to their low toxicity, biodegradability, and simple preparation. In this study, a DES composed of glycine, glycerol, and water (1:11:15 molar ratio) was used as a green extraction medium to isolate bioactive compounds from the red algae (Eucheuma cottonii), providing an eco-friendly solution for efficient marine bioresource utilization. This final product offers a simplified process, as the resulting extract requires no further separation prior to application. The DES exhibited favourable physicochemical properties, including a pH of 5, density of 1300.14 kg/m³, viscosity of 0.0198 Pa·s, and a freezing point below 263.15 K. Phytochemical screening of the DES-based extract confirmed the presence of phenolic and terpenoid compounds. The extract was directly incorporated into sunscreen lotion formulations at concentrations ranging from 0 to 15% (w/w). All formulations showed good homogeneity, with the highest sun protection factor (SPF) value of 8.37 observed in the lotion containing 15% red algae extract. This research shows the success of extracting natural anti-UV ingredients in an environmentally friendly and efficient manner.
Effect of Mackerel (Scomberomorus Commerson) Bone-Derived Gelatin on Alum Performance in Coagulation–Flocculation Processes Ramadhan, Aditya Nur; Zaharah, Titin Anita; Sayekti, Endah
POSITRON Vol 16, No 1 (2026): Vol. 16 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v16i1.88690

Abstract

Mackerel fish bones are commonly discarded as waste and may contribute to environmental pollution. This study aimed to extract gelatin from mackerel fish bones and evaluate its use as a coagulant aid with alum for the removal of organic matter and total suspended solids (TSS) from peat water. Gelatin was extracted and its functional groups were characterized using Fourier transform infrared (FTIR) spectroscopy. Treatment performance was evaluated through jar test experiments by varying Gelatin dosage (2, 4, 6, 8, and 10 g/L) and pH (4–8). Organic matter concentration was determined using the permanganometric titration method, while TSS was measured using the nephelometric method. The gelatin yield was 2.45%, and FTIR analysis confirmed the presence of amide functional groups, indicated by N–H stretching at 3353 cm⁻¹. The addition of gelatin enhanced alum performance, with optimal conditions at a dosage of 8 g/L and pH 7, achieving removal efficiencies of 89.3% for organic matter and 87.8% for TSS with a sedimentation time of 15 minutes. These findings demonstrate the potential of fish bone–derived gelatin as an effective and sustainable coagulant aid for peat water treatment.
A Flavonoid Rhamnoside from the Seeds of Nephelium lappaceum Linn. (Rambutan) Ditya Marissa; Hafidz Kamarul Hadj; Anis Shofiyani; Endah Sayekti; Rudiyansyah, Rudiyansyah
The Journal of Pure and Applied Chemistry Research Vol. 15 No. 1 (2026): Edition January-April 2026
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2026.015.01.7913

Abstract

Nephelium lappaceum L. (Rambutan) is a renowned seasonal fruit in Southeast Asia and has been cultivated for centuries in tropical regions. Research on the phytochemicals of this plant are scarce. Rambutan seeds are known to contain phenolics and flavonoids as the primary constituents. Unfortunately, the flavonoid structures in rambutan seeds remain unexamined. This study presents the extraction and structural elucidation of a flavonoid glycoside from the ethyl acetate fraction of N. Lappaceum seeds. Methanol crude extract of N. Lappaceum seeds was acquired through maceration and subsequently partitioned between n-hexane and ethyl acetate. Various chromatographic methods, such as vacuum liquid chromatography (VLC), column chromatography (CC), and preparative thin-layer chromatography (PTLC), were employed on the ethyl acetate fraction to obtain compound 1. Phytochemical assays employing 10% NaOH, Shinoda, and 5% FeCl3 on compound 1 demonstrated the presence of a flavonoid. According to the NMR data (1D and 2D) and HRTOF-MS-ES, compound 1 was characterised as the flavonoid glycoside, kaempferol-7-O-α-rhamnose or α-rhamnoisorobin.
Pelatihan Penggunaan Aplikasi Pendukung Publikasi Karya Tulis Ilmiah untuk Peningkatan Kompetensi Guru Kimia Sekolah Menengah Umum di Kabupaten Kubu Raya Andi Hairil Alimuddin; Endah Sayekti; Gusrizal Gusrizal; Ajuk Sapar; Rudiyansyah Rudiyansyah; Titin Anita Zahara; anis shofiyani; Nelly Wahyuni; Thamrin Usman; Risa Nofiani; Ari Widiyantoro; Agus Wibowo; Warsi Kurnia Rahayu; Yoga Pratama; Titik Lestari; Tria Susanti; Tariz Zharfan ME; Aderiya Munika
KOMUNITA: Jurnal Pengabdian dan Pemberdayaan Masyarakat Vol 5 No 2 (2026): Mei
Publisher : PELITA NUSA TENGGARA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60004/komunita.v5i2.595

Abstract

A workshop on the use of supporting applications for the publication of scientific papers has been carried out for Chemistry subject teachers. This activity is in collaboration with the Chemistry Subject Teachers' Conference (MGMP) of Kubu Raya Senior High Schools. This activity aims to utilize the application for compiling bibliographies and checking the similarity of scientific papers to facilitate the writing and publication of scientific papers. The method of implementing the Community Service (PKM) program is through: structural, participatory and instructional approaches; demonstration; practice and mentoring, and evaluation. The results obtained in the form of implementing a one-day workshop activity by presenting research method materials, library search tips and utilization of the Mendeley application, plagiarism checking applications and tips for avoiding plagiarism.The workshop was conducted in the form of a presentation and direct practice of using the application. In addition to being accompanied by the presenters, participants are also accompanied by instructors who have been prepared by the committee so that the activity can run smoothly. In order to increase the interest and attention of participants to participate in the activity, the organizing committee provides door prizes for participants who ask and answer quizzes from the presenters. This method can also be used as an evaluation of the level of understanding of participants in addition to the evaluation in the form of questionnaires distributed after the activity to measure the success of this PKM activity. Based on the questionnaires distributed, participants thought that this activity was very helpful in compiling scientific papers so that it was very useful for participants. Most participants considered that the facilities and training time were in accordance with those conveyed by the presenters who were in accordance with their fields. Overall, it can be concluded that the objectives of implementing this PKM have been achieved.
Uji Aktivitas Krim Tabir Surya yang Mengandung Ekstrak Etanol Alga Coklat (Sargassum sp.) Rosidah, Sofiatun; Sayekti, Endah; Rahmalia, Winda
Jurnal Ilmiah Farmasi Vol. 22 No. 1 (2026): Jurnal Ilmiah Farmasi
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jif.vol22.iss1.art6

Abstract

Background: Sunscreen protects the skin against ultraviolet (UV) radiation, particularly UVB, which is a major contributor to skin damage. Brown algae (Sargassum sp.) are rich in phenolic antioxidant compounds with potential as natural sunscreen agents. However, research on the incorporation of ethanolic extracts of Sargassum sp. into topical cream formulations and on the evaluation of both their photoprotective activity and formulation stability remains limited. This study therefore offers a fresh perspective on the dual role of brown algae extracts as natural sunscreen ingredients and stabilizing components in cosmetic preparations.Objective: This study aims to develop a cream formulation containing the ethanolic extract of Sargassum sp. and to evaluate its sunscreen activity.Method: The extract was obtained by maceration using 96% ethanol and subsequently subjected to phytochemical analysis. Cream formulations were prepared with six concentrations of the extract (0, 0.07, 0.13, 0.20, 0.27, and 0.43%) and evaluated for homogeneity, pH, spreadability, and in vitro Sun Protection Factor (SPF) using a UV-Vis spectrophotometer.Results: All cream formulations were stable, homogeneous, and exhibited pH values between 4.7 and 5.8, consistent with SNI 16-4399-1996 standards. The highest SPF value was observed in the 0.43% formulation, reaching 6.234 ± 0.503, which is categorized as extra protection. The sunscreen activity is attributed to phenolic compounds in the extract, which possess both antioxidant properties and UV-absorbing capacity.Conclusion: Sunscreen cream formulations containing the ethanolic extract of Sargassum sp. met the required physical stability standards. SPF testing revealed that the 0.43% extract formulation (KTS5) produced the highest SPF value, 6.234 ± 0.503, which is classified as extra protection and indicates optimal sunscreen activity.
Substitution Reaction of Hydroxy of Citronellol with Chloride Using A Mixture of Ammonium Chloride and Sulphuric Acid Sayekti, Endah; Silalahi, Imelda H; Zaharah, Titin Anita
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 2 (2015): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.2.720.135-146

Abstract

Substitution reaction of hydroxy of citronellol with chloride using a mixture of ammonium chloride (NH4Cl) and sulphuric acid (H2SO4) has been conducted. The citronellol was obtained from the reduction of citronellal using sodium borohydride (NaBH4) at room temperature for 30 minutes. Substitution of hydroxy of citronellol with chloride ion was carried out at 80 oC and molarity ratio of citronellol and NH4Cl 1:1, 1:2; 1:3; and 1:4 respectively. Identification of the product by gas chromatography-mass spectrometry (GC-MS) showed that the substitution reaction produced 2-isopropyl-5-methyl-1-chlorocyclohexane compound with rendemen 64,49 % in mol ratio of 1:4. The infra red (IR) analysis showed that there was a vibration at wave number 763 cm-1 which is a typical C-Cl vibrations.
Co-Authors Ade Mariadi Aderiya Munika Adhitiyawarman, Adhitiyawarman Agus Wibowo Agustiawan, Deri Ajuk Sapar Alimunddin, Andi Hairil Andi Hairil Alimuddin Andi Hairil Alimuddin Anggelita Anggelita Anim Rahmayati Anis Shofiyani Anis Shofiyani Anjarsari, Nita Ari Widiyantoro Aritonang, Anthoni Batahan Asniati, Asniati Azhar, Annisa Sylvania Dewi Dwi Purwati Ditya Marissa Diva Feraldy Dwi Siswanta Elvi Rusmiyanto Pancaning Wardoyo, Suci Lestari, Mukarlina, Emy Awalliah Eviva, Nur Fabiani, Verry A. Fathurrahman, Rizal Fitriani Fitriani Gusrizal Gusrizal Gusrizal Gusrizal Hafidz Kamarul Hadj Hasanuddin Hidayati, Isnaini Nur Imelda Hotmarisi Silalahi Imroah, Nurfitri Irma Nirmala Jumina Jumina Lestari, Titiek Lia Destiarti Masyita Masyita Minsas, Sukal Muhardi Mustofa Mustofa Narsito Narsito Nelly Wahyuni Nurlina, Nurlina P.W., Elvi Rusmiyanto Pertiwi, Imanda Firmantyas Putri Prayitno, Dwi Prayitno, Dwi Imam Puji Ardiningsih Radianti, Sri Rahayu, Warsi Kurnia Ramadhan, Aditya Nur Ratnasari, Popon Risa Nofiani Risa Nofiani Rosidah, Sofiatun Rudiyansyah Rudiyansyah Rudiyansyah Rudiyansyah Rudiyansyah Salatiana Salatiana Sari, Reny Puspita Shofiyani, Anis Sri Juari Santosa Sri Noegrohati Syah, Nur Rikswan Tariz Zharfan ME Thamrin Usman Thamrin Usman Titik Lestari Titin Anita Zahara Titin Anita Zahara Titin Anita Zahara, Titin Anita Titin Anita Zaharah Tria Susanti Uci Pradina Warsi Kurnia Rahayu Warsidah Warsidah Wibowo, M. Agus Wibowo, Muhamad Agus Widiyananta, Surya Winda Rahmalia Yamin, Bohari Mohd. Yoga Pratama Yudhi Zaharah, Titin Anita