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All Journal IPTEKMA Agrotekno Agrointek Agroindustrial Journal Journal of Fibers and Polymer Composites JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Jurnal Ilmiah Teknologi Pertanian Agrotechno
Amna Hartiati
Program Studi Teknologi Industri Pertanian, Fakultas Teknologi Pertanian, Universitas Udayana, Badung, Bali, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Engineering Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences

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Karakteritik Ekstrak Kulit Buah Kakao Sebagai Pewarna Alami Pada Variasi Jenis Pelarut dan Daya Ekstraksi Dengan Metode Microwave Assisted Extraction Agustina, Dwy Ristika Sari; Putra, Gusti Putu Ganda; Hartiati, Amna
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 12 No 4 (2024): Desember
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRMA.2024.v12.i04.p01

Abstract

Cocoa pods contain flavonoid compounds that can be used as natural colourants. These compounds can be obtained through an extraction process, one of which uses the Microwave Assisted Extraction method. This study was conducted to determine the effect of solvent type and power on extraction using the Microwave Assisted Extraction method on the characteristics of cocoa fruit skin extract and to determine the best combination of solvent type and power to produce cocoa fruit skin extract as a natural colourant. The experimental design used was factorial randomized block design with 2 factors grouped based on the time of implementation. The first factor is the type of solvent consisting of 3 type, namely ethanol, methanol, and acetone. The second factor is extraction power consisting of 3 levels, namely 300, 450, and 600 watts. The data were analyzed by analysis of variance and continued with Tukey test. The results showed that the type of solvent and extraction power and their interaction had a very significant effect on yield, total flavonoids, L*a*b* color intensity, but the treatment of solvent type and power and their interaction did not significantly affect the colour scoring and liking of cocoa pod skin extract. From the effectiveness index test, the best treatment to obtain cocoa pod skin extract as a natural dye was ethanol solvent and 600 watts power, with characteristics of yield 4.56 ± 0.27%, total flavonoids 9.48 ± 0.30 mg QE/g, L* 37.55 ± 1.34, a* 26.55 ± 0.92, b* 58.6 ± 1.70, colour scoring 4.55 ± 0.60 (less bright brown - not bright brown), and liking 4.25 ± 0.64 (neutral - somewhat like).
Karakteristik Komposit Biotermoplastik Berbasis Pati Termoplastis/ Glukomanan Termoplastis/Poli Asam Laktat Dalam Variasi Jenis dan Konsentrasi Filler Siringo-Ringo , Putri Agnesia; Harsojuwono, Bambang Admadi; Suwariani, Ni Putu; Hartiati, Amna; Hartiati, Sri
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 12 No 4 (2024): Desember
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRMA.2024.v12.i04.p05

Abstract

Biothermoplastic composites are eco-friendly materials that degrade more quickly. These composites are a mixture of biologically-based polymers that melt when heated and solidify when cooled, making them a potential solution for sustainable packaging materials. This study aims to determine the effect of various types and concentrations of fillers on the characteristics of biothermoplastic composites, as well as to identify the combination of filler type and concentration that produces the best characteristics in thermoplastic starch/thermoplastic glucomannan/polylactic acid (TPS/TPG/PLA) composites. The research used a Completely Randomized Design (CRD) factorial with the first factor being the type of filler (J), namely ZnO, Clay, and CaCO₃, while the second factor was the filler concentration (K), which was 5%, 7.5%, and 10% of the matrix material. Therefore, there were 9 treatment combinations, each repeated twice. The variables observed in this study were tensile strength, elongation at break, elasticity (Young's modulus), swelling, density, melting point, and biodegradation time. The data obtained were analyzed using variance analysis and followed by the Honest Significant Difference (HSD) test. The results showed that the type and concentration of filler had a significant influence on tensile strength, elongation at break, elasticity, swelling, density, melting point, and biodegradation time. The best biothermoplastic composite was obtained using 10% clay filler, with a tensile strength of 41.88 MPa, elongation at break of 0.68%, elasticity of 6.16 GPa, swelling of 0.48%, density of 1.01 g/cm³, a melting point of 170.05°C, and a biodegradation time of 24.5 days. The characteristics of the TPS/TPG/PLA biothermoplastic composite mostly meet SNI and international standards, except for elongation at break.
Karakteristik Buah Melon (Cucumis Melo L.) Pada Perlakuan Komposit Edible Coating Pati Singkong - Kitosan Kesuma, Regina Tara; Hartiati, Amna; Wartini, Ni Made
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 14 No 1 (2026): Maret
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRMA.2026.v14.i01.p03

Abstract

Melon (Cucumis melo L.) is a climacteric fruit with an average water content of 95,19%, vitamin C content of 6,91%, and sweetness level of 4,43°Brix, making it commonly consumed in its fresh form with a relatively short shelf life. This study aimed to determine the effect of the ratio of cassava starch–chitosan edible coating composite on the quality characteristics of minimally processed melon and to determine the ratio of cassava starch – chitosan edible coating composite that produces the best characteristics in handling minimally processed melon during storage period. The experimental used a Completely Randomized Design (CRD), consisting of five treatment combinations of cassava starch to chitosan ratios: P1 (91,67:8,33), P2 (83,33:16,67), P3 (75:25), P4 (66,67:33,33), and P5 (58,33:41,67). Each treatment was replicated three times, with storage continuing until visible spoilage occurred. The parameters observed included weight loss, firmness, total soluble solids, and vitamin C content. The results demonstrated that the cassava starch–chitosan edible coating composite had a significant effect on weight loss, total soluble solids, and vitamin C content, but did not significantly affect the firmness of the minimally processed melon during storage. Among the treatments, the P5 formulation (58,33:41,67) produce the best characteristic of processed melon fruit that lasts for at least 8 days storage period, as evidenced by a weight loss of 7,38%, firmness of 15,80 N, total soluble solids content of 6,06°Brix, and vitamin C content of 4,35%.
Analisis Faktor Yang Mempengaruhi Keputusan Konsumen Di Hidden Strawberry Garden, Kabupaten Buleleng Tarigan, Catherin Feronika; Hartiati, Amna; Suwariani, Ni Putu
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 14 No 1 (2026): Maret
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRMA.2026.v14.i01.p10

Abstract

Purchasing decisions in the agro-tourism sector are not only influenced by the quality of products in the form of fresh and processed strawberries, but also by price, place, promotion, people, process and physical evidence. This study aims to find out what factors affect consumer decisions, determine the dominant variables that represent each factor in influencing consumer decisions, and find out strategies to improve consumer decisions in Hidden Strawberry Garden, Buleleng Regency. The data collection technique in this study was carried out by distributing 85 questionnaires to respondents. The data obtained was then analyzed using factor analysis and processed using the SPSS version 30 program. The results obtained showed that the number of factors formed was 5 factors. Factor 1 (combination of people and processes) with an eigenvalue of 10,017 consisting of 6 variables, namely: the speed of employees in overcoming complaints, employee knowledge about agrotourism, employee attention to visitors, good and neat employee appearance, ease of communication, and the payment process is carried out quickly. Factor 2 (combination of products, physical evidence, and price) with an eigenvalue of 2,326 consisting of 8 variables, namely: product quality, good fruit quality, availability of strawberries, providing additional facilities such as relaxation areas and toilets, photo spot areas or special spots for visitors, parking lots, appropriate product selling prices, and a comfortable agrotourism atmosphere. Factor 3 (combination of promotions, people, products, and prices) with an eigenvalue of 1,831 consisting of 4 variables, namely: direct marketing, employee knowledge about agrotourism, product guarantees, and discounts. Factor 4 (combination of products and promotions) with an eigenvalue of 1,439 consisting of 4 variables, namely: variety of processed strawberry products, complete information on promotional media, products have attractive packaging, and product sizes vary. Factor 5 (combination of price and place) with an eigenvalue of 1,413 consisting of 4 variables, namely: an easy-to-reach agro-tourism location, a strategic agro-tourism location, a price that is easily accessible to all groups, and various product distribution channels available.
Karakteristik Ekstrak Pewarna Alami Bunga Bugenvil (Bougainvillea glabra) Pada Perlakuan pH Pelarut Dan Ukuran Partikel Menggunakan Metode Microwave Assisted Extraction Ardita, Mia; Wartini, Ni Made; Hartiati, Amna
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 14 No 1 (2026): Maret
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRMA.2026.v14.i01.p11

Abstract

Bougainvillea flower (Bougainvillea glabra) has potential as a source of natural colorant due to the presence of betacyanin pigment and bioactive compounds such as antioxidants. The extraction of these compounds can be carried out using the Microwave Assisted Extraction (MAE) method. This study aims to investigate the effect of solvent pH and particle size on the characteristics of natural colorant extract from bougainvillea flower, including extract yield, total betacyanin content, color intensity (a*, b*), and antioxidant capacity, as well as to determine the optimal solvent pH and particle size to obtain the best quality extract using the MAE method. The study was conducted using a factorial Completely Randomized Design (CRD) with two factors: solvent pH variations (1, 1,62, and 2,25) and particle sizes (40, 60, and 80 mesh). The results showed that both solvent pH and particle size significantly affected yield, total betacyanin content, redness level (a*), and yellowness level (b*). The interaction between the two factors had a significant effect on yield, total betacyanin content, redness (a*), and antioxidant capacity, but had no significant effect on yellowness (b*). The best treatment based on the effectiveness index test was obtained at solvent pH 2.25 with a particle size of 80 mesh, resulting in an extract with the following characteristics: yield of 81,89 ± 0,40%, total betacyanin content of 22,84 ± 1,20 mg/100g, redness level (a*) of 30,84 ± 0,55, yellowness level (b*) of 17,15 ± 0,61, and antioxidant capacity of 320,97 ± 6,08 mg GAEAC/g.
Co-Authors Agus Selamet Duniaji Agustina, Dwy Ristika Sari Aimar, Ilhan Maulana Alfridus Sandro Dacosta Perdisen Amirrulloh, Muchammad Rizqi Anak Agung Made Dewi Anggreni Anak Agung Putu Agung Suryawan Wiranatha Anggara Dena Mahayana Ardita, Mia Bambang Admadi Bambang Admadi Bambang Admadi Bambang Admadi H Bambang Admadi Harsojuwono Bawazier, Chazqa Bella Christina Tambunan Bella Christina Tambunan Boy Darwin Situmorang Chintya Angeline Liu Cintia Indrawati Denada Homia Bestari Dwijaksara Devi Hagelia Aritonang Dewa Ayu Anom Yuariani DEWA AYU ANOM YUARINI Dewa Ayu Trisna Budiari Dewa Made Dwi Pradana Putra Dewi Pujawati Dewi Sartika Dhea Novratena Diana Hilmalia Putri Dorothy Alma Bertie Dwi Fitriyanti Dwiyan Ricard Septianto Billy Eka Kadalora Esmeralda Oktaviani Simarmata Farhandi Saputra Farida Unggul Situmorang Fatahillah, Mufidah Riska Fitria Alfiana Fransiskus Yuven Wara Freddy Marthin Putra Simangunsong Gusti Ayu Mas Alstonia Parnawan Gusti Putu Ganda Putra, Gusti Putu Ganda Hamonangan Sipayung Harianja, Berkat Harsujuwono, Bambang Admadi Hartiati, Sri I Gede Budiastra I Gusti Ayu Lani Triani I Gusti Made Teddy Pradana I Gusti Ngurah Cahyadi Kresnawan I Kadek Adi Wijaya Putra I Ketut Pramananta I Ketut Satriawan I Komang Putra Adnyana I Made Adi Wiratama I Nyoman Semadi Antara I W.G. SEDANA YOGA I Wayan Agus Wijaya Adi Kesuma I Wayan Arnata I.A.Made Indri Paramita I.G.A Devika Inten A Ida Ayu Mahatma Tuningrat Ida Ayu Mahatma Tuningrat, Ida Ayu Mahatma Ida Bagus Wayan Gunam Ignashia, Maria Cory Jefri Yosafat Kadek Adi Wintagata Kadek Dodik Adi Permana Kadek Thiar Prahitadani Kesuma, Regina Tara Komang Gede Irwan Suparwan Komang Listia Damariyanti Krisna Iswara Kurniawati, Ni Kadek Gita Luh Putu Widia Sri Mastini Luh Putu Wrasiati Lutfi Suhendra Made Anggray Wulan Darini Made Nanda Pranata Mei Kurnia Muhamad Erwin Efendi Nadya Kirana A Ni Kadek Ariani Dewi Ni Kadek Riaminanti Ni Kadek Ummy Indiyani Ni Komang Suryandari Ni Luh Desi Rastiyati Ni Luh Feby Putri Pratami Ni Luh Gede Sari Dewi Ni Made Dwi Pusparini Ni Made Sri Wahyuni Ni Made Sri Wahyuni Ni Made Wartini Ni Putu Ita Purnamayanti Ni Putu Suwariani Nopia Cahyani Putri Nur Zaenab Mentari Wirawan Nyoman Indra Wiratama NYOMAN SEMADI ANTARA Pandila Diahtaradipa Ganantrya Pandu Desta Wisanggeni Poluan, Adella Neuville Hefly Purba, Dillon Marichman Putu Decky Yodharya Putu Julyantika Nica Dewi Rajagukguk, Jopi Deri P H Reni Okta Fitriani Risky Simarmata Risty, Kadek Septia Andia Runa Ramadanty Aisyi Putri Sadyasmara, Cokorda Anom Bayu Sando F. Limbong Siringo-Ringo , Putri Agnesia Sitorus, Roulina Tiolyn Rohana Sri Mulyani Sri Mulyani Sri Mulyani Sri Mulyani Sri Suhartini Susi Albina Br Purba Suwariani, Ni Putu Syah Banu Putra Sitepu Tarigan, Catherin Feronika Tissa Meiya Candigo Try Ono Siswandi Wardana, Made Kusuma Wedhana, Ida Bagus Gede Dika Wijaya Saputra Wiranatha , Anak Agung Putu Agung Suryawan Wiranatha, Anak Agung Putu Agung Suryawan Wrastiati, Luh Putu Yoga, I Wayan Sedana Yuarini , Dewa Ayu Anom Zulkifly Al Haq