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Agnes Dyah Novitasari Lestari
Universitas Papua
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Journal : Jurnal Natural

 1 
Kualitas Air Hujan di Desa Sirongo Kecamatan Tidore Utara Kota Tidore Kepulauan Nur Iswanto Nur Iswanto; Mirna Husen; Agnes Dyah Novitasari Lestari; Chafid Fandel; Dewi Rahyuni Dewi Rahyuni
Jurnal Natural Vol. 18 No. 1 (2022): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v18i1.170

Abstract

An analysis of the quality of rainwater has been carried out in rainwater storage tanks in Sirongo Village, North Tidore District, Tidore Islands City. The purpose of this study was to identify the quality of rainwater storage (PAH) based on the drinking water quality requirements according to the Minister of Health of the Republic of Indonesia No. 492/MENKES/PER/IV/2010 and knowing the quantity of water in meeting the drinking water needs of the local community. The results showed that based on the quality standards in the Regulation of the Minister of Health of the Republic of Indonesia No. 492/ Menkes/ Per/ IV/ 2010 concerning requirements for drinking water quality, rainwater quality in Sirongo Village is viewed from the physical parameters (Odor, Taste, Color, Temperature, and turbidity), chemical parameters (Flourida) and biological parameters (total coliform), meet the quality standards, while the chemical parameters (Iron and pH) do not meet the quality standards. Rainwater storage (PAH) in Sirongo village cannot meet the community's water needs because it is influenced by the amount of water used by each family member and the size of the PAH.
Kelarutan dan Swelling Power Mikrokapsul β-Karoten Terenkapsulasi dalam Matriks Pati-Kitosan Terikat Silang Ion Tripolifosfat Agnes Dyah Novitasari Lestari
Jurnal Natural Vol. 18 No. 2 (2022): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v18i2.184

Abstract

In this study, microencapsulation of β-carotene was carried out in a mixed matrix of starch and chitosan with the addition of tripolyphosphate ions as a crosslinker (denoted as starch-chitosan/TPP). Two types of starch were used here, namely native and hydrolyzed starch. Hydrolyzed starch was prepared by acid hydrolysis using 2 M HCl. Microcapsules were synthesized by adding dropwise dispersion of β-carotene in ethanol to the aqueous mixture of starch-chitosan/TPP matrix accompanied by magnetic stirring and heating at 90ºC. The synthesized microcapsules were then tested for solubility and swelling power in aqueous media. The results showed that the solubility and swelling behavior of microcapsules were influenced by the characteristics of the constituent starch. The solubility of hydrolyzed starch-chitosan/TPP was greater than that of the native starch-chitosan/TPP. The native starch-chitosan/TPP microcapsules had a higher swelling power value than the hydrolyzed starch-chitosan/TPP.
PENGARUH PENAMBAHAN PEMLASTIS GLISEROL DAN MINYAK BUAH MERAH (Pandanus conoideus) TERHADAP KUAT TARIK DAN ELONGASI BIOPLASTIK BERBAHAN PATI SAGU (Metroxylon sago)-KITOSAN Agnes Dyah Novitasari Lestari
Jurnal Natural Vol. 19 No. 1 (2023): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v19i1.242

Abstract

The need for plastic will increase along with technological and industrial developments, thereby increasing the amount of plastic waste. Oil and gas based plastics are not biodegradable. One way to limit the amount of plastic waste is to use biodegradable plastics, also known as bioplastics. In this study, the bioplastic material used was sago starch from Papua combined with chitosan with the addition of glycerol plasticizers and red fruit (Pandanus conoideus) oil. The use of red fruit oil, apart from being a plasticizer, is also intended to provide antioxidant properties to the resulting bioplastics. The variation in the weight ratio of sago starch: chitosan used is 4:1 and 1:1. The volume of glycerol and red fruit oil added was equal, namely 2.5 mL. After bioplastics have been synthesized, tensile strength and elongation tests are carried out. The results showed that the tensile strength and elongation were greatly influenced by the type of plasticizer, both in sago starch:chitosan ratios of 1:1 and 1:4. The addition of red fruit oil significantly reduced the tensile strength, both in the sago starch:chitosan ratio of 1:1 and 1:4, but increased the elongation in the sago starch:chitosan ratio of 1:4. This indicates that red fruit oil can be used as a plasticiser candidate in bioplastics as antioxidant packaging.
Kualitas Air Sumur Dekat SPBU Rendani Kelurahan Wosi Kecamatan Manokwari Barat Kabupaten Manokwari Provinsi Papua Barat Mamengko, David Victor; Raharjo, Syafrudin; Kusumo, Pribowo Angling; Lestari, Agnes Dyah Novitasari
Jurnal Natural Vol. 19 No. 2 (2023): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v19i2.256

Abstract

Wells are a groundwater source that is widely used by Indonesian citizens for sanitation and hygiene purposes. Well water quality is influenced by internal factors, namely the condition of the well itself, and external factors, namely the environment around the well. This research aims to analyze the quality of well water near the Rendani gas station, Wosi Village, West Manokwari District, Manokwari Regency, West Papua Province and compare it with the necessary water quality standards. In Indonesia, to guarantee the suitability of well water, water quality standards are stipulated in the Regulation of the Minister of Health Republic of Indonesia No. 32 of 2017. The research results show that the TDS, temperature, turbidity, sulfate, nitrate, iron, manganese and pH parameters meet the quality standards, while the chemical parameters nitrite, chromium (VI) and total coliform do not meet the quality standards. Therefore, it is necessary to treat the water to reduce levels of nitrite, chromium (VI) and total coliform before well water is consumed by residents.
Co-Authors Ali Aulia Ghozali Antoni Ungirwalu Bertha Mangallo Bertha Mangallo Chafid Fandel Dewi Eviane Dewi Eviane Dewi Rahyuni Dewi Rahyuni Dewi Rahyuni Dwi Siswanta Dwi Siswanta Dwi Siswanta Eko Sugiharto Eko Sugiharto Evelina Somar Eviane, Dewi Gabriella Shine De Kweldju Ishak Musaad Iswanto, Nur Louisa Jessica Permatasari Mamengko, David Victor Mirna Husen Muchammad Fauzan Kuri Pasai Mudasir Mudasir Muin, Ahmad Murtihapsari . Murtihapsari, Murtihapsari - Musaad, Ishak Naibaho, Julius Nur Iswanto Nur Iswanto Nur Iswanto Nur Iswanto Nurul Fajeriana M Ponisri, Ponisri Pribowo Angling Kusumo Ramlah Ramlah Ramlah, Ramlah - Rina Ernawati Ronny Martien Silalahi, Ida Siswati Somar, Evelina Sukmawati Sukmawati Sukmawati, Sukmawati Susilowati Syafrudin Raharjo Yori Turu Toja, Yori Turu Yoshua