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RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES, Departement Of chemistry, Faculty Of Mathematics And Natural Sciences, University Of Bengkulu, Jalan WR Supratman, Kandang Limun, Kota Bengkulu, 38371, 0736(20919).
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Rafflesia Journal of Natural and Applied Sciences (RJNAS)
Published by Universitas Bengkulu
ISSN : -     EISSN : 28083806     DOI : 10.33369/rjna.v4i1.34652
Core Subject : Health, Science,
Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology Medicine & Pharmacology Public Health
Rafflesia Journal of Natural and Applied Sciences (RJNAS) with e-ISSN: 2808-3806 is an open access and peer reviewed journal published by Department of Chemistry, Universitas Bengkulu, Indonesia. This journal is published two times per year (April and October). RJNAS publishes research papers, review and short communication in field of Chemistry, Natural, and Applied Sciences. RJNAS accept articles written in Bahasa Indonesia and English (preferable).
Arjuna Subject : Kimia(semua kategori) - Kimia Organik
Articles 43 Documents
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Pengawetan Telur Ayam Ras Dengan Perendaman Ekstrak Daun Jambu Biji (Psidium guajava) pada Suhu Ruang Deni Agus Triawan; Tenia Desenze; Doni Notriawan; Gustria Ernis
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 1 No. 2 (2021): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v1i2.22521

Abstract

Telah dilakukan pengawetan telur ayam ras dengan perendaman ekstrak daun jambu biji (Psidium guajava) pada suhu ruang. Penelitian ini bertujuan untuk mengetahui umur simpan telur ayam dan mengetahui pengaruh konsentrasi ekstrak daun jambu biji dan lama waktu perendaman pada pengawetan telur ayam ras. Kadar ekstrak daun jambu biji divariasikan mulai dari 10%, 20%, 30%, 40%, dan 50%. Lamanya perendaman telur ayam ras dalam larutan daun jambu biji divariasikan dari 1 jam, 3 jam, 5 jam, dan 1 hari. Lama penyimpanan telur ayam ras selama 21 hari. Telur yang telah diawetkan dengan ekstrak daun jambu biji merah (Psidium guajava) dianalisis untuk menentukan pH telur, nilai haugh unit (HU) telur dan nilai IKT. Dari hasil penelitian dapat disimpulkan bahwa semakin tinggi konsentrasi ekstrak daun jambu biji maka semakin bagus digunakan sebagai pengawet telur ayam ras. Semakin lamanya perendaman telur ayam ras pada ekstrak daun jambu biji juga mempengaruhi kualitas telur.
The effectiveness test of sunscreen cream with raw materials of coconut oil and active ingredients of Soursop (Annona Muricata L) leaf and Bay (Eugenia Polyantha Wight) leaf ethanol extracts Eni Widiyati; Devi Ratnawati; Dyah Fitriani; Lesta Nurul Jayanti; Nadia Arum Pangestu
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 1 (2022): April
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i1.22764

Abstract

The purpose of this study was to determine the effectiveness of cream made  of coconut oil as a raw  material and the active ingredients of soursop leaf ethanol extract  and bay leaf ethanol extract as sunscreens. The cream was made by mixing the hot (700C) water phase (glycerin, distilled water, methyl paraben, and triethanolamine = TEA) and the hot (700C) oil phase (s tearic acid, coconut oil, cetyl alcohol, propyl paraben, andlanolin). After the cream was formed, the active ingredients of soursop leaf ethanol extract and bay leaf ethanol  extract were added. A cream without an active ingredient was also made as a comparison.  The produced cream was determined to have ultraviolet (UV) radiation absorption by using a UV spectrophotometer. The resulting absorbance value was used to calculate the value of the sun protection factor (SPF) using the Mansur equation. The results showed that creams without active ingredients had the lowest SPF values. With an SPF of 3.048, the cream with 2% active ingredients and 2.5% bay leaf extract was labeled as a low-performance sunscreen cream
Pengaruh Campuran Cocodust Dan Serabut Halus Sabut Kelapa Terhadap Sifat Fisika Papan Partikel Teja Dwi Sutanto; Fika Dwi Andika; Charles Banon; Bambang Trihadi
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 1 (2022): April
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i1.22961

Abstract

Telah dilakukan penelitian mengenai pengaruh campuran cocodust dan serabut halus sabut kelapa terhadap sifat fisika papan partikel. Penelitian ini bertujuan untuk membuat papan partikel dari campuran cocodust dan serabut halus sabut kelapa dengan menggunakan perekat kompon karet cair. Mula-mula 53 gram campuran cocodust dan serat halus sabut kelapa dengan perbandingan prosentase 90:10. 80:20, 70:30, 60:40, dan 50:50 dicampur dengan kompon karet cair 30% diaduk hingga merata kemudian dicetak menjadi potongan uji dengan ukuran 10 cm x 5 cm x 7,5 cm lalu dikeringkan. Langkah berikutnya dilakukan pengepresan hingga diperoleh ketebalan 2,5 cm kemudian dilakukan karakterisasi yang meliputi pengujian MOR, MOE, kuat cabut sekrup dan daya serap air. Hasil penelitian menunjukkan bahwa kondisi terbaik diperoleh pada penggunaan campuran cocodust dan serabut halus sabut kelapa dengan perbandingan prosentase 60 : 40. Pada kondisi ini harga MOR, MOE, Kuat cabut sekrup dan daya serap air papan partikel berturut-turut adalah 35,25 kg/cm2; 74,68 kg/cm2 ; 1,94 kg/cm2 dan 28,34%.
Peningkatan Nilai Limbah Agroindustri Terhadap Uji Kuat Tekan Dan Uji Kuat Lentur Dalam Pembuatan Beton Agus Martono Hadi Putranto; Bima Triza Saputra; Brian Tri Saka; Riduan Asep Harefa; Rahmat Doni Halomoan Gultom; Tomi Ardiansyah
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 1 (2022): April
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i1.22984

Abstract

Telah dilakukan penelitian tentang peningkatan pemanfaatan limbah agroindustri terhadap kuat tekan dan kuat lentur dalam pembuatan beton. Dalam penelitian ini digunakan sampel dari limbah sekam padi dan cangkang sawit sebagai sumber silikanya, sedangkan untuk sumber kalsium oksidanya digunakan limbah dari kulit telur ayam ras,cangkang kepiting, cangkang  udang dan cangkang kerang laut. Komposisi campuran kalsium oksida dan silika berbanding 1:1, sedangkan persentase penggantian pada semen dalam penelitian ini adalah 0%, 4%, 6%, 8%, 10%, dan 12% dari berat semen, dengan umur penyimpanan beton 14 hari, 21 hari, 28 hari dan 35 hari. Hasil penelitian menunjukkan bahwa limbah agroindustri sebagai campuran sumber kalisium oksida dan silika dapat meningkatkan uji kuat tekan dan uji kuat lentur beton pada pesentasi penggantian antara 8% - 12% pada masa simpan beton 28 dan 35 hari.
Analysis of total phenolics and flavonoids content from methanol extract of Caesalpinia bonduc (L.) Roxb. seeds and antioxidant activity assay Samriani Samriani; Hasnah Natsir; Seniwati Dali; Abdul Wahid Wahab; Nunuk Hariani Soekamto; Paulina Taba
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 2 (2022): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i2.23929

Abstract

Caesalpinia bonduc (L.) Roxb. seed is known as gorek seed contain secondary metabolites such as alkaloids, tannins, flavonoids, and phenolics, due to the content of these secondary metabolites so that this plant has antioxidant activity. This study aimed to determine total phenolic and flavonoid contents of methanol extract of gorek C. bonduc seeds as well as antioxidant activity. Extraction of gorek C. bonduc seeds was carried out with methanol, then quantitative determination of total phenolic by the Folin-Ciocalteu method as Gallic Acid Equivalent (GAE)/gram of extract, flavonoid content by AlCl3 method as Quercetin Equivalent (QE)/gram of extract, and in vitro antioxidant activity with DPPH (2,2-diphenyl-1-picrylhydrazyl) method was in IC50 (inhibition concentration). Based on the results of research, the phytochemical screening of methanol extract of gorek C. bonduc seeds showed alkaloids, flavonoids, saponins, tannins, and phenolics. The determination of the total phenolic and flavonoid content were obtained 0.55 ± 0.02 mgGAE/g and 0.50 ± 0.02 mgQE/g, respectively. The antioxidant activity of methanol extracts and ascorbic acid showed IC50 values were 3770.77 ppm and 3.36 ppm respectively.
Synthesis of porous Hydroxyapatite (HAp) from Laying Chicken Waste Eggshells Agung Rimayanto Gintu; Elizabeth Betty E. Kristiani; Yohanes Martono
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 2 (2022): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i2.23931

Abstract

Hydroxyapatite (HAp) was the type of bioceramics synthesized from the compound which rich Calcium (Ca) contains, these bioceramics commonly used to repair the damage of hard tissues. In this study threatened the synthesis of HAp from laying chicken eggshells, the characterization of the eggshells showed that the contains of Calcium 0,9809 ± 0,0118g/g; Phosphate 0,0236 ± 0,0009g/g; and ratio of Ca/P 2,0840%. The synthetic process by base precipitation method showed the yield 77,5786 ± 0,3509%; and from the synthetic obtained the HAp with contains of Calcium 0,1522 ± 0,0047g/g; Phosphate 0,01354 ± 0,0019g/g; and ratio of Ca/P 0,9162%. The Biochemical characterization of the HAp showed that the Porosity 70,5940 ± 0,4104%; Biodegradability 16,1879 ± 0,1362%; and swelling Ability 28,0549 ± 0,1054%. The entire result of the research concluded that the sample eggshells potentially became one of the sources of HAp, and the HAp synthesized from the eggshells potentially to apply as remineralization agents.
Effect of Liquid Rubber Compound on the Physicochemical Properties of Particle Board from Coconut Frond Powder Teja Dwi Sutanto; Charles Banon; Bambang Trihadi
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 2 (2022): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i2.23932

Abstract

Particle board research made from coconut frond powder with various concentration of liquid rubber compound has been done. First particle board was made by mixing 50 mesh of coconut front powder with various concentration of liquid rubber compound there are 25; 30; 35; 40 and 45 % to obtain a particle board with the length, width and height of 5 x 10 x 7.5 cm and then dried by drying. Subsequently the particle board pressed to a thickness of 2.5 cm and then tested the modulus of rupture (MOR), the modulus of elasticity (MOE), the Screw Hold Strength and water absorption. The results indicated that the best condition was obtained on the use of 45 % of liquid rubber compound. In this condition, the value of MOR, MOE, screw hold strength and water absorption are 1436.16 g/ mm2, 2354.38 g/ mm2, 5.2708 N/ cm2 and 41.85% respectively.
Antibacterial Edible Coating of Ipomea batatas Incorporated with Lactobacillus acidophilus Miksusanti miksusanti; Najmatul Asriah; Indah Solihah; Dina Permata Wijaya
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 2 (2022): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i2.23933

Abstract

This study was conducted to analyze the effect of variations concentration of Lactobacillus acidophilus in edible coatings and their antibacterial activity against E. coli using the well diffusion method. This study used an edible coating of Prebiotic from purple sweet potato starch and Lactobacillus acidophilus with dilution variations (10-6, 10-7, 10-8, 10-9) as probiotics. In this study physical properties were tested for edible coatings such as color tests with visual observations, water content by the gravimetric method and viscosity using Viscometer Ostwald. The content of organic acids in edible coating solutions was measured using the HPLC method. Organoleptic test was conducted with taste and color parameters on the A-E scale of 30 respondents. Research results showed edible coating discoloration before and after incorporation from deep purple to brown. The value of water content and viscosity also changed from 62,8% to 71,4% and 569,97 cp to 486,64 cp respectively. The best antibacterial activity of edible coating incorporation with Lactobacillus acidophilus was 263,76 mm2. Organoleptic test on grapes that have been coated with edible coating showed that covered with edible coating contains probiotics (Lactobacillus acidophilus) has no effect on respondents' perception. Lactic acid and acetic acid were exist in edible coating which were incorporated with Lactobacillus acidophilus.
Storage modeling standard Cr(VI) solution based on comparison of time regression value with UV-Vis spectrophotometry FACHRURRAZIE; Elfiwani
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 2 (2022): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i2.23934

Abstract

Chromium (Cr) compounds are found in nature in two forms, Cr (III) and Cr (VI). Analysis of Cr (VI) was determined using spectrophotometer UV-vis. A standard solution must be fresh as a standard that is usually not used repeatedly in the measurement. This study aims to determine whether the standard solution of Cr (VI) be used for a certain period until it must be disposed of. This idea is based on Cr (VI) compounds that were categorized as hazardous and toxic materials. In this study, the shelf life of standard Cr (VI) was carried out with controlled temperature and humidity in a refrigerator at 4 ℃ during the test period of two days. In this study, there was found that every hour of storage of standard Cr (VI) will observe a change in the gradient value of the regression. The model then compared with p-value resulted in only up to 7 hours of storage with a deviation of regression slope and intercept compared with initial time (T0–T7) is 0.0062 and 0.0019 which and its increases over time. From the result, it can be concluded that standard regression can be used as a model for determining the maximum storage time by comparing the regression values each time so that the seven hours storage time is the limit where the Cr (VI) that can no longer be used as a measurement standard. It concerned that standard regression could be used as a model for determining the maximum storage time by comparing the regression values each time. Keywords: Cr (VI), Modeling, Regression, Spectrophotometry UV-vis, T-Test
Chemical characteristic of Fly ash and Bottom ash as potential source for synthesis of Aluminosilicate-based materials Elda ALYATIKAH; Siswo; Riaa Safitri; Tety Wahyuningsih Manurung; Rendy Muhamad Iqbal
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 2 No. 2 (2022): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v2i2.23935

Abstract

The world's population has reached 7 billion or doubled from the previous half-century and continues to increase every year. This increase in population is directly proportional to the increase in electrical energy consumption. Electricity needs in Indonesia are mostly met by Steam Power Plants. Unfortunately, the use of coal as an energy source in Steam Power Plants can cause environmental pollution, namely the waste generated by fly ash and bottom ash. However, even though it is classified as hazardous materials, silica (SiO2) and alumina (Al2O3) content in the waste are high enough so that it can be used for the synthesis of aluminosilicate-based materials. The ash waste in this study was obtained from the Steam Power Plant in Kapuas Regency, Central Kalimantan Province which was tested according to the ASTM D93-10 standard. The composition of SiO2, Al2O3, Fe2O3, and CaO in fly ash was 56.44; 31.31; 0.51; 0.78%. The compositions of SiO2, Al2O3, Fe2O3 and CaO in the bottom ash were 66.66; 17.09; 0.31; 5.40%. Based on its composition, fly ash and bottom ash are classified as type F ash. In addition, fly ash and bottom ash have SiO2/Al2O3 ratios of 3.90 and 1.80, respectively. It can be concluded that fly ash and bottom ash has the potential to be used as basic materials for the manufacture of aluminosilicate-based materials such as geopolymers, zeolites, and others.

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