scholarly journals Study of the corrosion-inhibiting activity of the green materials of the Posidonia oceanica leaves’ ethanolic extract based on PVP in corrosive media (1 M of HCl)

2021 ◽  
Vol 10 (1) ◽  
pp. 555-568
Author(s):  
Ghalia A. Gaber ◽  
Mohamed Mohamady Ghobashy ◽  
Mohamed Madani ◽  
Dalal Mohamed Alshangiti ◽  
Sheikha A. Alkhursani ◽  
...  
Keyword(s):  
Mild Steel ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Posidonia Oceanica ◽  
Open Circuit ◽  
Spectroscopy Analysis ◽  
Corrosive Media ◽  
Green Materials ◽  
The Fourier Transform ◽  
Inhibitive Action

Abstract Since the corrosion protection of mild steel samples in corrosive media (1 M of hydrochloric acid [HCl]) was cheap and successful, the ethanol extract of Posidonia oceanica leaves based on polyvinylpyrrolidone (P. oceanica/PVP) was analyzed using the weight reduction, the open circuit potential, and the potentiodynamic polarization methods. The obtained results explained that the productivity of hindrance increments had the greatest restraint efficiency of ∼81% at 1,000 ppm, as the concentration of the extract increased. Liable for adsorption as a thin layer on the surface of mild steel to protect it, the creation of kaolin-traced phenolic and polysaccharide compounds was confirmed by the Fourier transform infrared spectroscopy analysis. A scanning electron microscope was used to evaluate the inhibitive action of P. oceanica/PVP against steel in corrosive media and the change in surface morphology was considered. It is presumed that the ethanol removed from the Posidonia oceanica leaves can fill in as a compelling consumption inhibitor for gentle steel in HCL solution (1 M).

scholarly journals Proposal for a new monolithic constructive system using mycocomposite nucleus

2021 ◽  
Author(s):  
Vivyan Pinheiro Simão Ribeiro ◽  
Maria das Graças Machado Freire ◽  
Glória Andreia Ferreira Hernández ◽  
Michel Picanço Oliveira ◽  
Bárbara Ferreira de Oliveira
Keyword(s):  
Raw Material ◽  
Fungal Mycelium ◽  
Compression Tests ◽  
Spectroscopy Analysis ◽  
Microscopy Technique ◽  
Green Materials ◽  
Coffee Grounds ◽  
Suitable Combination ◽  
The Fourier Transform ◽  
Reinforcing Fiber

“Green” materials and productive processes have progressively been searched for. In the last years, it has increased the number of researches regarding mycocomposites characterization and, above all, their applicability. Biofabrication is a process that is carried out by incubating the substrate composed of organic residues with fungal mycelium. During incubation, the fungus gradually develops on the substrate, penetrating the microscopic channels of the different residues, and acting both as a reinforcing fiber and as a binding material. This Project was designed to seek the most suitable combination between substrate components and the fungus Ganoderma sp.aiming to obtain a mycocomposite which could be used as a nucleus of an alternative monolithic constructive system. In this project, composites using the fungus Ganoderna sp. and five different types of waste (white wood sawdust, cornstarch, bark and coffee grounds, and piassava fiber) were investigated. The morphology of these components, as well as mycelium and substrate interaction, was studied by scanning electron microscopy technique. The mechanical properties were determined through bending and compression tests, being correlated with the Fourier transform infrared spectroscopy analysis. The fabrication of a mycocomposite panel was proposed as an application; it could be included as the core of the prototype of a building system of walls, structured with steel and mortar. Thus, this project aimed to contribute to the ecosystem’s quality, once the raw material used was composed of organic waste that would be reinserted in a production process instead of being discarded in nature. Besides, the project suggests the production of a new biologically-based material for civil construction.

scholarly journals DNA Inhibition of Hydrogen Ion-Induced Corrosion of Mild Steel Used for Pipelines in Oil and Gas Industries

2021 ◽  
Vol 33 (4) ◽  
pp. 767-774
Author(s):  
Oluranti Agboola ◽  
Toluwani Adedoyin ◽  
Ojo Sunday Isaac Fayomi ◽  
Ayoola Ayodeji ◽  
Samuel E. Sanni ◽  
...  
Keyword(s):  
Mild Steel ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Open Circuit ◽  
Corrosive Media ◽  
Gas Industry ◽  
Inhibitor Efficiency ◽  
Loss Analysis ◽  
Corrosive Solution ◽  
Sem Micrograph

Corrosion of mild steel via chemical reaction in a corrosive environment is a problematic occurrence that is very common in oil and gas industries. Corrosion constitutes a huge part of the total costs in the production of oil and gas. Corrosion inhibitors have found interest in the scientific domain because they are mainly understood by their chemical complexes and formulations. Their utilization in small amount on metal surface used in oil and gas industries can help shield the metal from corrosion devoid of any significant alteration in the concentration of the corrosive media in the environment. An effort was made to study the possibility of using calf thymus gland DNA (CTGDNA) inhibitor in chlorine induced mild steel for possible usage in piping in oil and gas industry. The SEM micrograph shows that the adsorption of the CTGDNA biomacromolecules coat on the mild steel surfaces functions as a protection against HCl corrosive solution. Electrochemical study and weight loss analysis showed that the inhibitor efficiency (70.48 and 72%, respectively) of the tested DNA (CTGDNA) in HCl acidic corrosion environment for the mild steel was high at 1.5 M of HCl. The inhibitor efficiency decreased with increasing HCl concentrations. The open circuit potential (OPC) revealed that the mild steels got corroded until the end of the immersion. The intensities of XRD peak substantiate the existence of corrosion products of FeCl2.

UJI AKTIVITAS ANTIOKSIDAN FRAKSI N-HEKSAN DAUN AFRIKA (Vernonia amygdalina Del.) DENGAN METODE DPPH

2020 ◽  
Vol 5 (2) ◽  
pp. 250-257
Author(s):  
Nurul Fatimah ◽  
◽  
Reksi Sundu
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Free Radicals ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Hexane Fraction ◽  
Phytochemical Screening ◽  
Vernonia Amygdalina ◽  
Tropical Africa ◽  
Ic50 Value

Free radicals and reactive species are widely believed to contribute to the development of several diseases by causing oxidative stress and eventually oxidative. Vernonia amygdalina (Astereacea) is a small shrub or tree between 1 and 5m high growing throughout tropical Africa. Plants are generally known as bitter leaves is well cultivated and is a general market for merchandise in several countries. The purpose of this study was to determine the antioxidant activity of hexane fraction from ethanol extract od Frican leaves (Vernonia amygdalina Del.). The method used in this study was the DPPH (1,1-Diphenil-2-Picrylhydrazyl) method. The result of phytochemical screening showed that ethanolic extract of African leaves contained a composition of secondary metabolites of alkaloids, flavonoids, tannins, steroids/triterpenoids and saponins. The antioxidant activity of the extract of n-hexane fraction was classified as very weak with an IC50 value of 317.98 ppm.

In Vitro Antibacterial activity of ethanolic extract of Myrsine africana against laboratory Strains of Pathogenic Organisms

2016 ◽  
Vol 5 (04) ◽  
pp. 4512
Author(s):  
Jackie K. Obey ◽  
Anthoney Swamy T* ◽  
Lasiti Timothy ◽  
Makani Rachel
Keyword(s):  
Antibacterial Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
E Coli ◽  
Zones Of Inhibition ◽  
In Vitro Antibacterial Activity ◽  
Myrsine Africana

The determination of the antibacterial activity (zone of inhibition) and minimum inhibitory concentration of medicinal plants a crucial step in drug development. In this study, the antibacterial activity and minimum inhibitory concentration of the ethanol extract of Myrsine africana were determined for Escherichia coli, Bacillus cereus, Staphylococcus epidermidis and Streptococcus pneumoniae. The zones of inhibition (mm±S.E) of 500mg/ml of M. africana ethanol extract were 22.00± 0.00 for E. coli,20.33 ±0.33 for B. cereus,25.00± 0.00 for S. epidermidis and 18. 17±0.17 for S. pneumoniae. The minimum inhibitory concentration(MIC) is the minimum dose required to inhibit growth a microorganism. Upon further double dilution of the 500mg/ml of M. africana extract, MIC was obtained for each organism. The MIC for E. coli, B. cereus, S. epidermidis and S. pneumoniae were 7.81mg/ml, 7.81mg/ml, 15.63mg/ml and 15.63mg/ml respectively. Crude extracts are considered active when they inhibit microorganisms with zones of inhibition of 8mm and above. Therefore, this study has shown that the ethanol extract of M. africana can control the growth of the four organisms tested.

scholarly journals Ekstrak Etanol Kulit Buah Naga Menurunkan Indikasi Neoplasia Mammae Tikus Putih Berdasarkan Histopatologi dan Inhibitor Siklooksigenase-2

2018 ◽  
Vol 19 (1) ◽  
pp. 23
Author(s):  
Muhammad Thohawi Elziyad Purnama ◽  
Ragil Angga Prastiya ◽  
Faisal Fikri ◽  
Amung Logam Saputro ◽  
Bodhi Agustono
Keyword(s):  
Mammary Gland ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Growth Function ◽  
Histopathological Features ◽  
White Rats ◽  
Fruit Skin ◽  
Dragon Fruit ◽  
Cox 2 ◽  
Dermal Injection

Cancer caused uncontrolled cell proliferation and triggered by changes on cell information that regulate growth function. Each cell has different potential so many cancer prevalence such as endometrial cancer, lymph node cancer, lung cancer, skin and mammary gland cancer. The aims of this study were to assess the potential of dragon fruit skin ethanolic extract on white rats (Rattus norvegicus) exposed 7,12- Dimethylbenz(á)antrasena (DMBA) on mammary gland based on histopathological features and cyclooxygenase-2 (Cox-2) intensity. This study were used 20 of rats randomly divided into five group and each groups consisted of four rats, i.e: K+ weren’t treated DMBA and extract; K- were treated with DMBA; P1 were treated with DMBA and extract 10 mg/kg BW; P2 were treated with DMBA and extract 15 mg/kg BW; P3 were treated with DMBA and extract 20 mg/kg BW. The DMBA was given by intra dermal injection during twice a week for five weeks and the extracts with gastric tube everyday till 14 days. The data was analyzed by Anova test and continued with Duncan test. The result showed that the histopathological features were decrease significantly on P3. The variables of Cox-2 intensity were decrease significantly on P1, P2 and P3. Conclusion of this study was ethanol extract of dragon fruit skin can decrease neoplastic indication of mammary gland on white rats (R. norvegicus) based on histopathological features and Cox-2 inhibitors.

scholarly journals Inhibitive action of gramine towards corrosion of mild steel in deaerated 1.0M hydrochloric acid solutions

2012 ◽  
Vol 64 ◽  
pp. 82-89 ◽  
Author(s):  
G. Quartarone ◽  
L. Ronchin ◽  
A. Vavasori ◽  
C. Tortato ◽  
L. Bonaldo
Keyword(s):  
Hydrochloric Acid ◽  
Mild Steel ◽  
Acid Solutions ◽  
Hydrochloric Acid Solutions ◽  
Inhibitive Action

scholarly journals A Study of Mild Steel Corrosion UsingAdhatoda Vasica(AV) Extract as Inhibitor in Different Acid Medium

2010 ◽  
Vol 7 (4) ◽  
pp. 1284-1289 ◽  
Author(s):  
P. Matheswaran ◽  
A. K. Ramasamy
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Acid Medium ◽  
Acidic Medium ◽  
Active Sites ◽  
Mixed Type ◽  
Steel Corrosion ◽  
Adhatoda Vasica ◽  
Mild Steel Corrosion ◽  
Inhibitive Action

Corrosion behavior of mild steel in acidic medium usingAdhatoda Vasica(AV) extract was investigated. The inhibitive effective ofAdhatoda Vasicaon the corrosion of mild steel in different acidic medium has been studied by weight loss and polarization methods. The Ecorrvalues are shifted slightly towards negative side in presence of inhibitors which indicate the inhibitors inhibit the corrosion of mild steel in acids solution by controlling both anodic and cathodic reactions due to the blocking of active sites on the metal surface. It is evident that inhibitors bring about considerable polarization of the cathode as well as anode. It was, therefore, inferred that the inhibitive action is of mixed type.

scholarly journals Capsule Formulation of Ethanolic Extract of Pasak Bumi (Eurycoma Longifolia Jack.,) and its Effect on Human Health Vital Signs

2017 ◽  
Vol 22 (2) ◽  
pp. 91
Author(s):  
Laela Hayu Nurani ◽  
Eka Kumalasari ◽  
Abdul Rohman ◽  
Sitarina Widyarini
Keyword(s):  
Bitter Taste ◽  
Vital Signs ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Inclusion Criteria ◽  
Capsule Formulation ◽  
Healthy Human ◽  
Eurycoma Longifolia ◽  
Healthy Humans ◽  
Eurycoma Longifolia Jack

Pasak bumi (Eurycoma longifolia) has the potential to be developed as antihypertensive, antipyretic, aphrodisiacs and health supplements. The use of E. longifolia as a traditional medicine needs to be pursued in the form of more effective and appropriate formulation. The capsule preparations are easy to make and cancover the bitter taste of E. longifolia. Clinical trials in this study use design pre-post treatment in healthy humans. Subjects used were male - healthy men and healthy women who met inclusion criteria and were subjected with formulated capsule for 14 days. The study resulted capsule formula comprising of the ethanolic extract of E. longifolia 300 mg, vivapur 101 300 mg, 58 mg maydis starch, aerosil 3%, talc 2%, and Mg stearate 1%. The results showed that the capsule of E. longifolia did not affect the value of heart rate, respiration rate, body temperature and weight (P > 0.05), based on paired t-test, but they causes a decrease in blood pressure of healthy human. The ethanol extract of E. longifolia caused vasodilation of blood vessels that can be used in antihypertensive therapy.

scholarly journals Formulasi Krim Tabir Surya Ekstrak Etanol Daun Kersen (Muntingia calabura L.) untuk Kesehatan Kulit

2018 ◽  
Vol 28 (4) ◽  
pp. 263-270
Author(s):  
Anita Dwi Puspitasari ◽  
Dewi Andini Kunti Mulangsri ◽  
Herlina Herlina
Keyword(s):  
Ethanolic Extract ◽  
Sun Exposure ◽  
Ethanol Extract ◽  
Total Phenolic ◽  
Total Flavonoids ◽  
Physical Chemical ◽  
Rotary Evaporator ◽  
Maximum Protection ◽  
Physical And Chemical ◽  
Muntingia Calabura

Sunlight has many health benefits, but high sun exposure can also cause skin problems ranging from redness, inflammation, and the worst is triggering the appearance of skin cancer. One way to protect the skin from the sun is by using a sunscreen. Kersen Leaf (Muntingia calabura L.) has a high total flavonoids and total phenolic so that it can be used as a natural active ingredient for making sunscreen creams. The purpose of this study was to formulate and evaluate sunscreen cream preparations with variations in the concentration of ethanol extract of Kersen Leaf  Muntingia calabura L.) and to know the SPF value. Extract of kersen leaves (Muntingia calabura L.) using the maceration method with 70% ethanol. The extract was concentrated using a rotary evaporator. Four formulas were made with variations in the concentration of ethanol extract of kersen leaves. Formula 1 (cream base) without ethanolic extract of kersen leaves; formula 2 with ethanol extract of 1 gram kersen leaves; formula 3 with ethanol extract of 2 grams kersen leaves and formula 4 with ethanol extract of 3 grams kersen leaves. The four formulas were tested for physical, chemical and SPF values. Testing the SPF value using spectrophotometric method. For sticky power does not meet standard because it is less than 4 seconds. The Formula 1 SPF value is 0.1149; formula 2 is 7.6574 (extra protection); formula 3 is 13.7847 (maximum protection); and formula 4 is 19.0871 (ultra protection). The greater the concentration of ethanol extract of kersen leaves the greater the SPF value. From the results of the study, it was found that the four formulas fulfilled the requirements of physical and chemical characteristics, namely organoleptic, homogeneity, distribution, and viscosity, and had a significant SPF values, namely formula 2, 3 and 4. Abstrak Sinar matahari memiliki banyak manfaat bagi kesehatan, namun paparan sinar matahari yang tinggi juga dapat menyebabkan masalah kulit mulai dari kemerahan, peradangan, dan yang paling buruk adalah memicu munculnya kanker kulit. Salah satu cara untuk melindungi kulit dari sinar matahari yaitu dengan menggunakan tabir surya. Daun kersen (Muntingia calabura L.) mempunyai kandungan flavonoid total dan fenolik total yang tinggi sehingga dapat dimanfaatkan sebagai bahan aktif alami untuk pembuatan krim tabir surya. Tujuan penelitian ini untuk melakukan formulasi dan evaluasi sediaan krim tabir surya dengan variasi konsentrasi ekstrak etanol daun kersen (Muntingia calabura L.) serta mengetahui nilai SPF-nya. Ekstraksi daun kersen menggunakan metode maserasi dengan pelarut etanol 70%. Ekstrak dipekatkan menggunakan rotary evaporator. Dibuat empat formula dengan variasi konsentrasi ekstrak etanol daun kersen. Formula 1 (basis krim) tanpa ekstrak etanol daun kersen; formula 2 dengan ekstrak etanol daun kersen 1 gram; formula 3 dengan ekstrak etanol daun kersen 2 gram; dan formula 4 dengan ekstrak etanol daun kersen 3 gram. Keempat formula diuji karakteristik sifat fisika, kimia dan nilai SPFnya. Pengujian nilai SPF menggunakan metode spektrofotometri. Untuk daya lekat belum memenuhi standar karena kurang dari empat detik. Nilai SPF Formula 1 sebesar 0,1149; formula 2 sebesar 7,6574 (proteksi ekstra); formula 3 sebesar 13,7847 (proteksi maksimal); dan formula 4 sebesar 19,0871 (proteksi ultra). Semakin besar konsentrasi ekstrak etanol daun kersen semakin besar nilai SPF-nya. Dari hasil penelitian diperoleh bahwa keempat formula memenuhi persyaratan karakteristik sifat fisika dan kimia yaitu organoleptis, homogenitas, daya sebar pH, dan viskositas, serta memiliki nilai SPF yang bermakna yaitu formula 2, 3, dan 4.

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