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All Journal International Journal of Renewable Energy Development Jurnal Ilmu Lingkungan BERKALA SAINSTEK Eksergi: Chemical Engineering Journal Bulletin of Chemical Reaction Engineering & Catalysis UNEJ e-Proceeding Warta Pengabdian Chemistry Indonesian Journal of Chemical Research CHEESA: Chemical Engineering Research Articles Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Jurnal Kartika Kimia Jurnal Teknologi Dedikasi: Jurnal Pengabdian kepada Masyarakat Jurnal Pijar MIPA Jurnal Sains dan Teknologi Makara Journal of Science Journal of Biobased Chemicals (JOBC) Sewagati Jurnal Teknik Kimia dan Lingkungan International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Penelitian Sains dan Teknologi Indonesia Indonesian Journal of Science and Education Dinamika Kerajinan dan Batik: Majalah Ilmiah
Bekti Palupi
Department Of Chemical Engineering, Faculty Of Engineering, University Of Jember, Jalan Kalimantan 37, 68121 Jember
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Effect of Time Variation on Chlorophyll Concentration in Cocoa Leaf Extraction using the UAE (Ultrasonic Assisted Extraction) Method Rahmawati, Istiqomah; Shabrina, Nadhilah; Fachri, Boy Arief; Amini, Helda Wika; Palupi, Bekti; Rizkiana, Meta Fitri; Nurtsulutsiyah, Nurtsulutsiyah; Pradipta, Shima Nuril; Afwal, Diza Raudhatul; Reza, Muhammad
Jurnal Kartika Kimia Vol 5 No 1 (2022): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v5i1.97

Abstract

Until now, Cocoa (Theobroma cacao L.) plantation is a sector that has been continuously cultivated. Cocoa leaves contain chlorophyll, which is an important pigment in photosynthesis as sunlight absorber. The aim of this study is to determine the effect of extraction time to the concentration of chlorophyll in cocoa leaves. The extraction time was varied from 5 to 25 min with constant variables, namely power and ratio of raw materials. In this study, Ultrasonic Assisted Extraction (UAE) method was used due to its effectiveness. The concentration of obtained chlorophyll was determined by using UV-Vis spectrophotometry. The optimum extraction time was 15 min producing concentration of chlorophyll a of 9.39 mg/L, chlorophyll b of 4.78 mg/L, and total chlorophyll of 14.16 mg/L.
Optimization of Microwave Ultrasound Extraction of Biopolymer from using Response Surface Methodology Rahmawati, Istiqomah; Annisa, Yasmin; Farwah, Zilma Aliyah; Adrian, Febri; Anggraini, Ranita Anggi; Fachri, Boy Arief; Reza, Muhammad; Rizkiana, Meta Fitri; Palupi, Bekti; Amini, Helda Wika
Jurnal Kartika Kimia Vol 6 No 2 (2023): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v6i2.174

Abstract

This study aims to determine the effect of combining the two extraction methods Microwave Assisted Extraction (MAE) and Ultrasound-Assisted Extraction (UAE) on the yield and content of ulvan polysaccharides from Ulva lactuca with the best operation condition. Algae biomass U. lactuca is abundant, according to its content, U. lactuca contains polysaccharides which can be used as biodegradable plastic materials. The extraction was carried out using Microwave Ultrasound Extraction by varying the microwave power from 100 to 800 watts, the microwave time variations from 10 to 50 minutes, the ultrasonic wave temperature range from 40-80 oC, and the ultrasonic wave time variations from 20 to 50 minutes. Optimization was performed using the response surface methodology center composite design methodology for a total of 28 runs. Several tests were carried out to determine the character of the ulvan polysaccharide, including water content, FT-IR spectroscopy, High-Performance Liquid Chromatography, and its antioxidant activity. The effect of combining Microwave Assisted Extraction (MAE) and Ultrasound-Assisted Extraction (UAE) provides an optimal extraction condition with higher yields and good quality ulvan.
Preparation and Characterization of Cellulose Acetate from Pandanus tectorius via Microwave Irradiation Rizkiana, Meta Fitri; Amrullah, Abdul Malik Karim; Elisah, Nor; Amini, Helda Wika; Palupi, Bekti; Rahmawati, Istiqomah; Fachri, Boy Arief
Indonesian Journal of Chemical Research Vol 12 No 1 (2024): Edition for May 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-riz

Abstract

This research focuses on extracting cellulose from thorn pandan and evaluating its potential as a raw material for cellulose acetate. Thorn pandan contains polysaccharides, especially cellulose. In its fabrication process, cellulose acetate is produced from cellulose acetylation reaction. Cellulose is extracted using the Microwave-assisted Extraction method with variations in NaOH concentration (1, 2, and 3%), H2O2 concentration (10, 20, and 30%), and time variables (20, 40, and 60 minutes). Extraction optimization was performed with Response Surface Methodology (RSM) model BBD (Box-Behken Design). Several characterizations were carried out to determine the characteristics of cellulose acetate, namely Degree of Acetylation, FT-IR spectroscopy and X-Ray Diffraction (XRD). The highest cellulose yield obtained in the extraction process was 50.7% with a variable of 3% NaOH, 30% H2O2 and 60 minutes. XRD analysis shows the angle value 2θ = 22.53798° of thorn pandan cellulose structure is almost similar to commercial cellulose. FTIR functional group identification of cellulose acetate showed the presence of carbonyl (C=O) and (C-O Acetyl) group, respectively seen at wave numbers 1734 cm-1 and 1256 cm-1. The acetyl content of cellulose acetate from thorn pandan produced is 35.475%. Therefore, thorn pandan biomass has the potential as a raw material for making cellulose acetate.
Polyphenol Extraction from Musa corniculata Peel Using Microwave Assisted Extraction (MAE) Method with Ethanol Solvent Rahmawati, Istiqomah; Sa’roni, Achmad; Wardhani, Maharani Tri; Fachri, Boy Arief; Palupi, Bekti; Rizkiana, Meta Fitri; Amini, Helda Wika; Reza, Muhammad
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.41494

Abstract

Banana peel (Musa corniculata) is one of the superior plants in Indonesia which is rich in polyphenolic compounds as a source of antioxidants. The potential of polyphenolic compounds as antioxidants can be used as an alternative to reduce banana peel waste. This study aims to determine the total content of polyphenols and antioxidant activity of horn banana peel extract. Extraction used the Microwave Assisted Extraction (MAE) method with ethanol solvent and the variables were extraction time (4, 7, and 10 minutes), solvent concentration (50, 73 and 96 %), ratio of simplicia mass to solvent volume (1:12, 1 :8, 1:6 g/mL) with a microwave power of 150 Watt. Determination of polyphenol content using the Folin-Ciocalteau method and the ability of polyphenols as antioxidants were analyzed by DPPH test. This study used the Design Expert 13 Response Surface Methodology software, the Box Behnken type, to determine the extraction parameters for the total polyphenol content. The highest total polyphenol content was obtained at 354.02 mg GAE/g from the combination of parameters 50% solvent concentration, 10 minutes extraction time, and the ratio of horn banana peel powder to 1:8 g/mL solvent.
OPTIMASI EKSTRAKSI SENYAWA FENOLIK DAUN SIRIH MERAH (Piper Crocatum Ruitz & Pav) MENGGUNAKAN METODE MICROWAVE ASSISTED EXTRACTION (MAE) Amini, Helda Wika; Nugroho, Yeremia Prasetya; Rahman, Agus; Rizkiana, Meta Fitri; Rahmawati, Istiqomah; Palupi, Bekti; Fachri, Boy Arief
Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Vol 7, No 3 (2024)
Publisher : Universitas Islam Kalimantan MAB Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/dl.v7i3.16431

Abstract

Karena efek samping yang lebih sedikit daripada pengobatan sintetik, pengobatan menggunakan bahan alami menjadi pilihan populer di Indonesia. Oleh karena itu, diperlukan penelitian lebih lanjut mengenai bahan alami yang dapat digunakan sebagai obat, salah satunya adalah sirih merah. Penelitian ini bertujuan mengetahui kondisi optimal untuk mengekstraksi senyawa fenolik daun sirih merah dengan menggunakan metode Microwave Assisted Extraction (MAE). Penelitian ini menggunakan daun sirih merah ukuran 60 mesh yang telah dikeringkan. Dengan pelarut etanol 96%, daun sirih merah diekstraksi dengan variabel daya microwave 150 watt, 300 watt, dan 450 watt. Rasio bahan terhadap pelarut adalah 0,05 gram/mL, 0,1 gram/mL, dan 0,15 gram/mL. Ekstraksi berlangsung selama 5-15 menit. Analisis hasil penelitian dilakukan dengan analisis total fenol menggunakan metode Folin-Ciocalteu. Pada run ke-8, total fenol tertinggi adalah 0,0736 mg GAE/g, dengan rasio pelarut 0,05 g/mL, waktu ekstraksi 5 menit, dan daya microwave 300 watt.
Pelet Unggul: Inovasi Teknologi Tepat Guna dari Sampah untuk Peningkatan Produktivitas Ternak Lele di Lamigot Ys Farm Pakusari Palupi, Bekti; Rahmawati, Istiqomah; Rizkiana, Meta Fitri; Rafif, M. Attar; Tarigan, Eigiya Nina; Herdianto, Dimas Nur; Yohanes, Yohanes; Shofiah , Laila Nur
Sewagati Vol 9 No 1 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i1.2488

Abstract

Sektor peternakan dan perikanan merupakan pilar utama ketahanan pangan di Indonesia, dengan budidaya ikan lele menjadi pilihan utama karena kemudahannya dan tingginya konsumsi oleh masyarakat. Data BPS Jawa Timur menunjukkan peningkatan produksi ikan lele dari 127.539 ton pada tahun 2020 menjadi 136.437 ton pada tahun 2021. Namun, masalah utama yang dihadapi peternak, khususnya skala kecil dan menengah seperti UMKM Lamigot YS Farm di Kabupaten Jember, adalah mahalnya harga pelet pakan ikan. Untuk mengatasi kendala ini, program pengabdian masyarakat ini menawarkan solusi berupa pengembangan Teknologi Tepat Guna (TTG) dengan menciptakan mesin pencetak pelet menggunakan bahan baku sampah organik. Solusi ini bertujuan untuk mengurangi biaya produksi, mendukung pengelolaan limbah berkelanjutan, dan meningkatkan produktivitas serta kemandirian peternak. Kegiatan ini meliputi sosialisasi, pelatihan, dan pendampingan teknis, diharapkan dapat meningkatkan pemahaman dan keterampilan peternak dalam memproduksi pelet pakan ikan secara mandiri. Dari hasil pengamatan selama 2 minggu, lele yang diberi pelet sampah organik bertambah massanya menjadi 9 gram, sementara yang diberi pelet komersial hanya memiliki massa 8,3 gram. Hal ini menunjukkan bahwa inovasi pelet dari sampah organik memiliki kualitas yang lebih baik daripada pelet komersial sehingga layak dikembangkan.
Modifikasi Fe3O4 dari Pasir Besi Pantai dengan Asam Oleat dan PEG melalui Metode co-Precipitation untuk Menangani Limbah Mikroplastik PET di Air Laut Mumtazah, Zuhriah; Bima Suci, Syeikh Maulana; Hakiki, Rizki Maulana; Muharja, Maktum; Palupi, Bekti; Rahmawati, Istiqomah; Yolanda Putri, Ditta Kharisma; Ramadana, Ifan
Jurnal Ilmu Lingkungan Vol 23, No 2 (2025): March 2025
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.23.2.418-426

Abstract

Mikroplastik diartikan sebagai plastik yang berukuran kurang dari 5 mm. Mikroplastik telah terdeteksi secara luas di lingkungan perairan dan menjadi kontaminan yang sangat mengkhawatirkan. Oleh karena itu sangat diperlukan cara untuk menghilangkan mikroplastik dari air secara efektif. Tujuan dari penelitian ini yaitu untuk mengetahui pengaruh penambahan surfaktan asam oleat (OA) dan polietilen glikol (PEG) pada nanopartikel magnetit untuk pemisahan mikroplastik polyethylene terephthalate (PET) di media air. Penambahan surfaktan memungkinkan nanopartikel dapat terdispersi dengan baik dan lebih stabil. Nanopartikel magnetit disintesis dari pasir besi pantai Watu Ulo Jember dengan metode co-precipitation. Nanopartikel magnetit dikarakterisasi menggunakan PSA untuk mengetahui distribusi ukuran partikel dan FTIR untuk menentukan gugus fungsi pada n-Fe3O4 yang telah dimodifikasi dengan OA dan PEG. Ukuran partikel yang didapatkan berkisar antara 458,7–955,4 nm dengan intensitas tertinggi 712,4 nm. Efisiensi adsorpsi mikroplastik yang diperoleh menggunakan n-Fe3O4 adalah 77,8%, n-Fe3O4/PEG 91,7%, dan n- Fe3O4/OA 95,2%.
The Optimization of Chlorophyll Extraction from Ulva Sp. with Ultrasound-Assisted Liquid Biphasic Systems Method Susilowati; Fakhri Arkaan Humaidi; Boy Fachri; Bekti Palupi; Meta Fitri Rizkiana; Istiqomah Rahmawati; Helda Wika Amini
Indonesian Journal of Science and Education Vol. 8 No. 1 (2024): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v8i1.1085

Abstract

Ulva sp. is a type of green algae that is easily found in the shallow seas of Indonesia and contains various bioactive compounds. Chlorophyll is a bioactive compound that functions as a natural dye, free radical scavenger, and antioxidant in the body. Chlorophyll extraction with conventional methods requires a relatively long time and large amount of solvent. In this research, chlorophyll extraction from Ulva sp. with the Ultrasound-Assisted Liquid Biphasic System (UALBS) method. Ulva sp. as much as 2.5 grams mixed in acetone solvent, added K2HPO4 solution, and carried out the sonification process in a dark room. The extraction process performs at a parameter range of 5-15 minutes, ratio 0.05-0.1 g/mL, and 60-100 mesh particle size. The extracted filtrate was added with petroleum ether and distilled water to form a biphasic condition. The extracted chlorophyll was analyzed with chromatography and spectrophotometry method. Antioxidant activity was analyzed using the DPPH method. The optimum result of Ulva sp. chlorophyll extraction at an extraction time of 10 minutes, the ratio of solids to solvent was 0.1, the particle size of 60 mesh produced a yield of 1.88% with chlorophyll a 20.13664%, chlorophyll b 21.58672% and total chlorophyll 41.71012%, and the percentage inhibition 45.32%.
TTG Sistem Otomatisasi Perangkap Hama Penggerek Buah Kopi (Hypothenemus hampeii Ferr.) dengan Pemanfaatan Limbah Kopi sebagai Atraktan dan Pestisida Setiawan, Arinda Sabrina; Subekhi, Jovenlee Gibran; Susanti, Eka Puji; Prayuga, Devi; Raharjo, Nadhya Cahya Dwy; Widarti, Rr Diva Naila Putri; Darojat, Zakiah; Firdausi, Adnan Maulana; Hanafi, Yogie Alfian; Palupi, Bekti
Sewagati Vol 9 No 3 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i3.2335

Abstract

Kabupaten Jember yang terletak di Provinsi Jawa Timur merupakan salah satu daerah penghasil kopi utama di Indonesia. Namun, para petani kopi di wilayah ini masih menghadapi kendala akibat serangan hama penggerek buah kopi (Hypothenemus hampeii Ferr.) yang menyebabkan penurunan mutu dan jumlah hasil panen. Bedhag Kopi sebuah usaha kecil yang berdiri sejak 2016 telah memanfaatkan pupuk organik berbahan dasar limbah kopi, tetapi belum mampu sepenuhnya mengatasi permasalahan hama tersebut. Untuk mengatasi permasalahan ini telah dilakukan pelatihan bagi petani mengenai pembuatan perangkap hama otomatis yang menggunakan teknologi sensor serta pemanfaatan limbah kopi sebagai atraktan dan pestisida alami. Kegiatan ini bertujuan untuk meningkatkan pemahaman dan keterampilan petani dalam mengelola limbah kopi secara lebih optimal, sekaligus mengintegrasikan sistem berbasis Internet of Things (IoT) guna memantau dan mengendalikan hama dengan lebih efektif. Penerapan teknologi ini diharapkan dapat menjadi solusi berkelanjutan bagi petani kopi dalam meningkatkan produktivitas dan mutu hasil panen.
Kinetics Study in Essential Oil Extraction from Basil Leaves by Microwave Assisted Hydrodistillation Putri, Ditta Kharisma Yolanda; Udroto, Firsta Retnaningtyas; Fatimah, Dianavita; Fachri, Boy Arief; Rahmawati, Istiqomah; Mumtazah, Zuhriah; Palupi, Bekti; Al Fajri, Maktum Muharja
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i1.4930

Abstract

Essential oil is compounds that contained in plants and have many benefits. Basil is an aromatic plant that can produce essential oils. Essential oils can be extracted from basil leaves using Microwave Assisted Hydrodistillation (MAHD) method. To determine the efficiency of the MAHD method, it’s necessary to study the kinetics of the extraction method. It’s because kinetic studies can be used to identify the optimal point in the process where the highest efficiency is obtained, so the extraction process can be optimized. The aim of this research is to evaluate the suitable kinetic model for the basil leaf extraction process using the MAHD method. This extraction using 100 grams of basil leaves and 200mL aquadest, heated at various microwave power 150W, 300W, and 450W. The extractions were carried out for 70 minutes with 10 min intervals. The results showed that the largest oil yield was obtained when using 450W power, which was 0.190 grams. Based on the experimental data obtained, the most suitable kinetic model is second-order model. This can be analyzed from the highest R2 (0.9946 – 0.9999) and the lowest RMSE (0.0062 – 0.0349). Increasing the irradiation power will affect the extraction rate and parameter values of each kinetic model.
Co-Authors Abdul Malik Karim Amrullah Adelina, Saltsabita Nourin Adrian, Febri Adriansyah, Muhamad Afwal, Diza Raudhatul Aina Christalia Rinastiti Akbar, Muhammad Faqihuddin Akhsan, Maulana Yudha Al Fajri, Maktum Muharja Alifia Rahma Putri Neysella Amartya, Audi Nur Andikasari, Emi Anggraini, Ranita Anggi Annisa, Yasmin ansori ansori Ardianti , Nanda Melani Ari Susanti Ari Susanti Ari Susanti Ariel Seanhan Haezer Asshofy , Muhammad Agil Atiqa Rahmawati Atiqa Rahmawati Atiqa Rahmawati AYU WULANDARI Aziz, Mohamad Naufal Nizaar Azizi, Daffa Hafiziaulhaq Badril Azhar Badril Azhar Bestari, Cherobina Bida Ayu Bima Suci, Syeikh Maulana Bimo Bayu Aji Boy Arief Fachri Boy Fachri Darojat, Zakiah Devara, Arighy Zahirah Faiqy Diah Tri Wulandari Diana Madhuri Dianavita Fatimah Dianita Ivana Permata Dihayat, Icha Shofia Dini Rahmawaty Ditta Kharisma Yolanda Ditta Kharisma Yolanda Putri Elisah, Nor Fachri, Boy Fakhri Arkaan Humaidi Fandora, Ardan Jauza Farwah, Zilma Aliyah Fatimah, Dianavita Felix Arie Setiawan Firdausi, Adnan Maulana Firmansyah, Alex Firmansyah, Arfian Alwi Firmansyah, Muhammad Sahrul Firsta Retnaningtyas Udroto Gregah Pangayoman Hartanto P Gregah Pangayoman Hartono Putro Habibatul Inayah Harti Arini Hakiki, Rizki Maulana Hanafi, Yogie Alfian Helda Wika Amini Helda Wika Amini Heni Pujiastuti Herdianto, Dimas Nur Hidayat, Debby Aurellia Humaidi, Fakhri Arkaan Indrayani, Lilin Intan Permatasari Istiqomah Rahmawati Istiqomah Rahmawati Kenji Sakai Kenji Sanomoto Khoirunnissa , Aulia Kurniawan, Muhammad Rizky Lailatul Krisna Abdullah Lestari, Afrila Tutut Dwijati Lukman Nulhakim Lumbantoruan, Sri Lestari Maharani, Regita Gustiayu Pramisti Mahfud Mahfud Mahfud Mahfud Maktum Muharja Maulida Septiyana Megasari, Tri Elok Setya Meta Fitri Rizkiana Mizanurafi’ Ghifarhadi Prasiefa Mohammad Nor Muhammad Ilham Muhammad Reza Muhammad Reza Muharja, Maktum Nadia Ayumna Fa’iqoh Nanda Ayudiyah Andriani Nikita Meidi Nova Chintya Kurniawati Nova Chintya Kurniawati Nugraha, Briantara Agung Nugroho, Yeremia Prasetya Nur Karima Nur Karima Nurani, Yukti Nurjannah, Lailia Nurtsulutsiyah Nurtsulutsiyah Nurtsulutsiyah, Nurtsulutsiyah Nurul Hidayati Pradipta, Shima Nuril Pramudiska, Riavinola Viyoni Pratiwi, Widya Septaningtyas Pravitasiwi, Nanda Tricya Julia Prayuga, Devi Purimahua, Amanda Augre Maharani Putri, Salsabila Ananda Rachman, Darryl Akeyla Rafif, M. Attar Raharjo, Nadhya Cahya Dwy Rahman, Agus Ramadana, Ifan Ratnasonia, Samantha Githa Ratri Sekaringgalih Regita Gustiayu Pramisti Maharani Relyando, Syahfa Adinda Reswara Musyafa Rizalluddin, Muhammad Rizki Fitria Darmayanti Rizki Fitria Darmayanti Rossi Agnessi Pebriana Sakai, Kenji Salma, Isni Salma Salsabillah Salsabila , Nida Ayu Sanomoto, Kenji Saputri, Ocha Sa’roni, Achmad Septianti, Kiki Setiawan, Arinda Sabrina Shabrina, Nadhilah Shofiah , Laila Nur Sholeha, Irdatus Sonya Hakim Raharjo Subekhi, Jovenlee Gibran Susanti, Eka Puji Susilowati Susilowati Syaifullah, Rangga Yudha Tarigan, Eigiya Nina Tashiro, Yukihiro Tri Elok Setya Megasari Udroto, Firsta Retnaningtyas Ulfiani, Khoirun Nisya' Uzinuzulla, Yunita Virda Wardani, Salza Belila Kusuma Wardhani, Maharani Tri Wibowo, Jihan Nafila Widarti, Rr Diva Naila Putri Wiwik Pratiwi Yahya, Ahmad Daily Yohanes Yohanes Yohanes Yolanda Putri, Ditta Kharisma Yolanda, Ditta Kharisma Yukihiro Tashiro Yukti Nurani Zuhriah Mumtazah