Robby Gus Mahardika

• Master of Science
• Lecturer at University of Bangka Belitung

The world population is increasing, which has implications for increasing food needs. Food crop cultivation faces problems, namely pest attacks. Pest attacks will cause a decrease in agricultural productivity. The use of synthetic insecticides has a negative impact on the environment and human health. Therefore, it is important for further research...

ABSTRAK Spirulina merupakan mikroalga potensial untuk dikultur karena mengandung bahan aktif pada pangan fungsional, seperti pigmen fikosianin, fenolik dan senyawa flavonoid. Pertumbuhan dan produksi senyawa aktif Spirulina optimal apabila dikultur pada media yang mengandung nutrisi yang cukup, terutama nitrogen. Penyerapan nitrogen dipengaruhi ole...

Aik Abik Village has very high potential for medicinal plants. People still often use medicinal plants as therapeutic treatment. The wood hole plant (Timonius flavescens (Jacq.) Baker) is often used by local people for facial care and treating acne. These plants can be developed into peel-off mask derivative products which can be used as superior v...

One of the toxic compounds that are carcinogenic (cancer causing) in food is chloropropanol compound. These compounds are currently of great concern considering the increasing number of cancer and kidney failure sufferers in the world apart from degenerative diseases. Derivatives of these compounds are widely found in food ingredients, such as vege...

The impact of reactions free radical compounds can cause various health problems such as inflammation, aging, and cancer. Therefore, to avoid damage caused by free radicals, the body needs an important substance, antioxidants. Natural antioxidants are more recommended than synthetic antioxidants because synthetic antioxidants must be in accordance...

Spirulina merupakan mikroalga hijau kebiruan yang mengandung klorofil-a. Kandungan klorofil-a Spirulina sangat dipengaruhi oleh faktor lingkungan pada media kultur, salah satunya salinitas. Salinitas yang optimal dapat meningkatkan kadar pigmen klorofil-a, namun peningkatan kadar salinitas juga memberikan pengaruh negatif pada pertumbuhan Spirulina...

Synthesis of silver nanoparticles using a bioreductant of simpur leaf extract to minimize the use of inorganic materials that are harmful and not environmentally friendly. Silver nanoparticles with the bioreduction method, the bioreductant solution was mixed with AgNO3 precursor and the addition of PVA concentrations was 0%, 0.75%, 1.5% and 3%. The...

Indonesia is a tropical country with a high level of infectious disease.. One of the bacteria that often infects and causes diarrhea is Escherichia coli. E. coli infection can cause food poisoning and indigestion. Infectious diseases caused by bacteria can be treated by taking antibiotics. However, excessive and inappropriate use of antibiotics can...

Microalgae can be used as a good biodiesel raw material because there are quite a lot of oil microalgae, one of which is Spirulina sp. Cultivation Process of Spirulina sp. using seawater media produces more optimal biomass than freshwater media. This study used Bangka Seawater as a growth medium for Spirulina sp., and identification fatty acid of S...

In general, public awareness of air quality in Indonesia is increasing. In accordance with the average concentration of particular PM2.5, air quality in Indonesia has improved from 2020 to 2021. However, in some densely populated cities, poor air quality still occurs continuously, for example Jakarta. PM2.5 pollution prediction will be made using m...

Limbah cair tapioka mengandung zat organik dan padatan tersuspensi yang tinggi. Penelitian ini memanfaatkan arang aktif selulosa daun pandan laut untuk mengadsorbsi kandungan bahan organik dan padatan tersuspensi. Penelitian ini bertujuan untuk mengetahui kandungan lignin dan selulosa daun pandan laut sebelum dan sesudah delignifikasi, menentukan k...

Currently, diseases caused by infection with pathogenic microorganisms are increasing, this is indicated by the increasing interest in antibacterial substances. This research was conducted on the stem of the pelawan plant (Tristaniopsis merguensis Griff.) with the aim of identifying the secondary metabolites contained in the extract of n-hexane, et...

According to regulation number 722/MENKES/Per/IX/88 of the Minister of Health of the Republic of Indonesia, Rhodamine B is one of the dangerous dyes, and its use in food products is prohibited. Rhodamine B can cause adverse health effects including irritation, impaired liver function, and liver cancer. Although it has been banned, the use of Rhodam...

Kelubi fruit is one of the many fruits that grow in Bangka Belitung which has a sour taste. Kelubi fruit contains ascorbic acid, malic acid and oxalic acid. The potency and sour taste of Kelubi fruit can be used as a catalyst in the synthesis of dihydropyrimidinone compounds and activity as antibacterial. Dihydropyrimidinone compounds were synthesi...

Virgin Coconut Oil (VCO) is pure coconut oil produced from fresh coconuts and does not contain additional chemicals. VCO has a high lauric acid content which acts as an antibiotic, namely antiviral, antibacterial and antiprotozoal so that VCO can increase the human body's resistance to disease or viruses. Free fatty acid (FFA) levels will significa...

Penyakit tidak menular (Non Communicable Disease (NCD) masih mendominasi penyebab kematian secara global. Ada beberapa faktor yang menyebabkan masyarakat terjangkit NCD, salah satunya adalah lemahnya daya tahan tubuh akibat pola hidup masyarakat yang kurang sehat. Salah satu cara untuk meningkatkan daya tahan tubuh dari berbagai penyakit adalah ada...

Chlorophyll a is bound within microalgae and other phytoplankton found in surface seawater. Chlorophyll is an important biochemical component in the molecular apparatus of microalgae that is responsible for photosynthesis. Photosynthesis is the process whereby phytoplankton use sunlight energy and dissolved nutrients to convert inorganic carbon to...

Diabetes mellitus continues to increase along with the increasing pattern of consuming ready-to-eat foods. The consequences of this habit will have a negative impact on the health of the body so that it can cause death. Treatment of diabetes mellitus is carried out in various ways, including administration of insulin and synthetic drug therapy. How...

Research entitled Solubility of Metals Content Bangka Tin Tailings Sand Using Inorganic Acids The sample used was tailings sand from tin mining on Bangka Island which was destroyed using several variations of inorganic acids alone, H 2 SO 4 , HNO 3 and HCl and mixed with H 2 SO 4 -HCl, H 2 SO 4 -HNO 3 , HNO 3 -HCl and H 2 SO 4 -HNO 3 -HCl. Metal co...

Diabetes mellitus (DM) is a disease characterized by hyperglycemia due to decreased insulin secretion, or decreased insulin sensitivity, or both. If insulin is not available or the amount is low, then glucose cannot enter the cells and will continue to be in the bloodstream. DM can cause chronic complications such as eye complications, skin infecti...

The manufacture of battery cathode electrodes made of LiFeO4 and activated carbon from pepper peel has been successfully carried out. The electrodes were made using the soli state reaction method with the addition of adhesives in the form of PVdf and NMP. The resulting homogeneous mixture is then placed in a mold and dried in an oven at 90° to dry...

Escherichia coli merupakan bakteri Gram negatif yang dapat menimbulkan infeksi saluran kemih, saluran empedu, penyakit serius lainnya di rongga perut, dan keracunan makanan yang ditandai dengan diare. Penyakitinfeksiyang disebabkan oleh bakteri dapat diobati dengan mengonsumsi antibiotik. Akan tetapi, resistensi bakteri terhadap antibiotik telah di...

Pertumbuhan bakteri jerawat dapat diatasi dengan menggunakan senyawa antibakteri, tanaman yang berpotensi untuk dikembangkan sebagai antibakteri jerawat adalah Citrus x microcarpa Bunge (jeruk kunci). Berdasarkan kajian literatur, genus Citrus mengandung steroid, flavonoid, terpenoid, tanin, dan saponin dengan bioaktivitas sebagai antioksidan dan a...

Parit Padang is a sub-district located in Sungaliat District, Bangka Regency, Bangka Belitung Islands Province. Parit Padang Village is in the middle of the city of Sungailiat, where the spread of covid-19 will spread faster. In order to prevent covid-19, the students of the Parit Padang Community Service Program at Bangka Belitung University condu...

Indonesia is currently being shaken by the COVID-19 pandemic, which has infected thousands of people and even died. The government has given an appeal to the community to reduce the spread of the COVID-19 virus. However, not many people have complied with the government's appeal. Especially in Srimenanti Village, very few people know how dangerous...

The spread of the corona virus is increasingly widespread in several areas of Indonesia including the province of the Bangka Belitung Islands. One area that is very strategic and often traversed by people that may be exposed to the spread of the corona virus is Srimenanti Village, Bangka Regency. Therefore, community service activities were carried...

Tumbuhan sapu-sapu (Baeckea frutescens L.) merupakan salah satu jenis keanekaragaman hayati yang tumbuh dan persebarannya cukup banyak di Indonesia. B. frutescens L diketahui memiliki senyawa metabolit sekunder aktif yang dapat dimanfaatkan sebagai obat, antibakteri, dan antioksidan. Penelitian ini dilakukan untuk menganalisis kandungan senyawa met...

Citrus x microcarpa Bunge is a plant that is used optimally by the people of Bangka Belitung known as the ‘Jeruk Kunci’. Utilization of this plant in the fruit is used as an acid enhancer in food and is made in the form of syrup. So that the jeruk kunci fruit waste is widely available and has not been utilized.based on literature, Citrus x microcar...

The use of synthetic strong acid catalysts or lewis acid catalysts from metals often causes environmental problems at the end of a chemical reaction. In this research offers an alternative solution using kelubi fruit extract ( Eleiodoxa conferta ) as a green catalyst, especially in the synthesis of 3,4-dihydropyrimidin-2 (1H)-ones derivatives which...

The characteristics of the six sand samples taken from the location of the former tin mining land on average contain heavy metals such as Ti, Sn, Mn, Pb, Cu, Zn, Cu, and As. Nb rare earth metal contains all sand samples except PDTF 1. The highest content is in the PDTF 2 sample which is 103 ppm. While the Y metal content is found in samples of PDTF...

The Synthesis of chitosan - LiCLO 4 solid electrolyte membrane has been carried out. The membrane is prepared by using a casting method. Chitosan 0.6 gram, LiClO 4 (Sigma-Aldrich > 95%) with variations of 10% and 40% (w / w) and 10% PVA (w / w) put into the measuring cup. Furthermore, the mixture was dissolved in a 2% acetic acid solution of 30 mL...

This study reports the synthesis of vanillyl methyl ketone from eugenol through Wacker oxidation and anti-inflammatory activity test toward COX-1 and COX-2 through in silico analysis. Wacker oxidation process was catalyzed by PdCl2 and CuCl2 using DMF solvent under the aerobic condition at room temperature for 48 hours. The product of the synthesis...

Penelitian ini dilakukan di Kecamatan Merawang, Kabupaten Bangka dengan sampel pasir hasil tailing timah sebagai bahan uji dalam mengaplikasikan penerapan dua instrument (alat) yaitu alat X-Ray Fluorescence (XRF) Portable dan X-Ray Fluorescence (XRF) Max/Portrace dalam mengetahui unsur mineral logam tanah jarang. Metode penelitian diawali dengan pe...

Halal product assurance is a global concern, especially in some Southeast Asian countries. The Government of Indonesia through law No. 33 of 2014 requires food and beverage products circulating in Indonesia to have halal certificates. Responding to the central government program, the Government of Bangka Belitung has issued a Regional Regulation on...

Abstract : This study aims to determine the antidiabetic activity and toxicity of the acetone extract of Tristaniopsis merguensis Griff leaf. The antidiabetic test was the α-glucosidase inhibition method, while the toxicity test used the Brine Shrimp Lethality Test (BSLT) method. The acetone extract possessed antidiabetic activity with an IC50 valu...

Natural polymers such as chitosan are one of the interesting things to study or are widely used as industrial raw materials such as adsorbents, membranes, and edible films. Portunus pelagicus L. is one of the sources of chitosan from nature. The shell of Portunus pelagicus L. in Bangka Island are waste from the untapped food industry. Even though t...

Ekstrak aseton didapatkan dari daun Tristaniopsis merguensis Grifft menggunakan metode maserasi. Ekstrak aseton selanjutnya difraksinasi dengan metode partisi cair-cair dengan pelarut etil asetat. Penentuan kadar fenolik total dilakukan berdasarkan metode Follin-Ciocalteu dengan standar asam galat. Hasil penelitian ini menunjukkan bahwa fraksi etil...

Antibacterial tests were carried out using ethanol extract of kelubi meat (Eleidoxa conferta), extraction using the Microwave-Assisted Extraction method with a ratio of 2: 20 for 30 minutes at 60 °C. Antibacterial tests using diffusion methods with concentrations of 20%, 40%, 60%, 80%, and 100%; positive control of 0.005% amoxillin and DMSO negativ...

Rukam fruit (Flacourtia rukam) is one of the species spread in Indonesia, specifically Bangka Island. Rukam has a higher phenolic ratio than guava (Psidium guajava). Phenolic compounds have a major role as antioxidants, while antioxidants have the ability to fight free radicals. Therefore a study was conducted to examine the application of secondar...

Tristaniopsis merguensis Griff. is a species of the Myrtaceae family and has been widely used by people of Bangka Belitung as a traditional medicine to reduce cholesterol, gastric pains, and improve cardiac performance. Extraction methods are the crucial efficacy of herbal medicine. The conventional method, like maceration, takes a long time. In th...

Natural polymers such as chitosan are one of the interesting things to study or are widely used as industrial raw materials such as adsorbents, membranes, and edible films. Portunus pelagicus L. is one of the sources of chitosan from nature. The shell of Portunus pelagicus L. in Bangka Island are waste from the untapped food industry. Even though t...

Ocean primary production is an important factor for determining the ocean’s role in global carbon cycle. Primary production is the process whereby inorganic carbon is fixed in the sunlit (euphotic) zone of the upper ocean and forms the base of the marine food pyramid. It occurs when marine phytoplankton use sunlight energy and dissolved nutrients t...

Cratoxylum glaucum Korth. is a members of the family Hypericaceae which are spread in Indonesia, one of which is found in the forest of the Bangka Belitung Islands. Cratoxylum glaucum Korth is often used by the people of Bangka Belitung as a flavoring ingredient from ancient times until now it is still consumed and utilized by people around Bangka...

Agricultural activities are one of the main income sources in Bangka Regency, but this activity also provides a dilemma for environmental conservation. Oil palm plantation activities always use fertilizers and pesticides, leaving organic contamination in the waters. Cases of poisoning against pesticides, especially organophosphate groups, have been...

Green inhibitors are inhibitors that utilize secondary metabolites of plant to reduce the rate of corrosion. Secondary metabolites with heteroatom content phosphate, nitrogen, oxygen and sulfur function as ligands and adsorption centers to bind metals. These metabolites compounds include alkaloids, flavonoids, and tannins. Tristaniopsis merguensis...

The purpose of this study was to determine the total phenolic and antioxidant capacity of Tristaniopsis merguensis leaf acetone extract. In this study extraction using the maceration method for 3 days with a ratio of dry leaves and solvents of 1: 10 (w / v). Analysis of total polyphenols in this study was carried out using the Follin-Ciocalteu meth...

Indonesia is a country that produces a wealth of abundant biodiversity, one of which is a plant that is often cultivated the tree of Pelawan (Tristaniopsis merguensis). Pelawan trees are widely spread in Indonesia one of them found in the forests of the Bangka Belitung island. Therefore, this study aims to identify the secondary metabolites and tes...

Halal Products merupakan salah satu divisi pada kerjasama Indonesia, Malaysia, Thailand Growth Triangle (IMT-GT). Keberadaan divisi tersebut dalam rangka memenuhi tuntutan konsumen akan tersedianya produk yang memenuhi standar halal. Pemerintah Bangka Belitung mendukung program halal products dengan dikeluarkannya Peraturan Daerah No.16 Tahun 2016...

In accordance Regulation Minister of Health Republic of Indonesia No. 492 / MENKES / PER / IV / 2010 about Quality Requirements of Drink Water, the acidity (pH) of drink water about 6.5-8. Based on situation analysis, Teru Village of Central Bangka Regency is below the standard, which about 4.1. The low pH of drink water in Teru village cause negat...

Silica Waste cooking oil can be used as a soap or biodiesel. Good soaps or biodiesel should be from oils that have low levels of fatty acids and free radicals. However, waste cooking oil has high free fatty acid and free radical, it is necessary to increase the quality of waste cooking oil. One effort to improve the quality of waste cooking oil can...

Neutralizing free radicals can use both synthetic and natural antioxidant compounds. Although synthetic antioxidant compounds are more active, but lately the use of synthetic antioxidants is being reduced because they are reported to have carcinogenic side effects. Natural antioxidant compounds found in plants are phenolic groups such as flavonoids...

p class="AbstractEnglish"> Abstract: Activated carbon is the most common adsorbents used in regeneration of cooking oil process. Waste frying oil is a residual of frying that has been destructed due to repeated use. For reusable, it must through by oil regeneration process to eliminate impurities and free radicals. One of the abundant biomass and f...

Karbon aktif merupakan salah satu adsorben yang umum digunakan dalam upaya peningkatan regenerasi minyak jelantah. Minyak jelantah merupakan limbah hasil sisa penggorengan yang telah terdestruksi akibat pemakaian yang berulang-ulang. Untuk dapat digunakan kembali minyak jelantah harus mengalami proses regenerasi minyak untuk menghilangkan impuritas...

Minyak jelantah merupakan minyak goreng yang telah mengalami destruksi akibat pemakaian yang berulang-ulang. Minyak jelantah bersifat karsinogenik bagi tubuh manusia serta merupakan limbah hasil industri penggorengan yang apabila dibuang secara langsung ke lingkungan akan menjadi polutan. Penelitian ini bertujuan untuk mengkaji penambahan karbon ak...