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Andri Widianto
"Penelitian ini dilakukan untuk mempelajari mekanisme ekstrak kunyit putih Curcuma Zedoaria dan ekstrak ubi jalar ungu Ipomoea Batatas sebagai inhibitor korosi ramah lingkungan untuk API 5L pada lingkungan 3,5 NaCl. Karakterisasi kedua inhibitor dilakukan dengan pengujian FTIR dan menunjukkan bahwa senyawa yang terdapat pada kedua inhibitor tersebut adalah senyawa flavonoid. Pengujian polarisasi potensiodinamik dan EIS dengan variasi penambahan inhibitor serta campuran antara kedua inhibitor dilakukan untuk mempelajari sifat inhibisi, dari penelitian ini dapat diketahui bahwa masing ndash; masing kedua inhibitor dapat digunakan sebagai inhibitor ramah lingkungan untuk logam API 5L pada lingkungan 3,5 NaCl sedangkan campuran antara kedua inhibitor tersebut tidak dapat melindungi logam API 5L pada lingkungan 3,5 NaCl.
Dari pengujian polarisasi potensiodinamik menunjukkan bahwa dengan penambahan konsentrasi inhibitor ekstrak kunyit putih maka laju korosi akan semakin menurun dan nilai efisiensi inhibisi semakin naik dengan nilai tertinggi adalah 70,5 , sedangkan dengan penambahan konsentrasi inhibitor ekstrak ubi jalar ungu laju korosi semakin turun dengan nilai efisiensi inhibisi maksimal sebesar 15,09.
Namun hasil pengujian polarisasi potensiodinamik untuk inhibitor ekstrak kunyit putih 400 ppm yang ditambah dengan ekstrak ubi jalr ungu menunjukkan nilai laju korosi yang semakin meningkat. Hasil pengujian EIS menunjukkan bahwa kedua inhibitor ini dapat melindungi logam dengan membentuk sebuah lapisan film yang melapisi permukaan logam. Mekanisme adsorpsi inhibitor menunjukkan sebagai mekanisme adsorpsi secara fisik dan kimia serta sesuai dengan model dari Langmuir.

This study was conducted to study the mechanism of white turmeric extract Curcuma Zedoaria and purple sweet potato extract Ipomoea Batatas as a green corrosion inhibitor for API 5L in a 3.5 NaCl environment. The characterization of both inhibitors was done by FTIR testing and showed that the compounds present in both inhibitors were flavonoids. Potentiodynamic polarization and EIS polarization with variation of inhibitor addition and mixture of both inhibitors were performed to study the inhibitory properties, from this study it can be seen that each of the two inhibitors can be used as a green corrosion inhibitor for API 5L metal in a 3.5 NaCl environment whereas the mixture between the two inhibitors can not protect the 5L API in the 3.5 NaCl environment.
From potentiodynamic polarization testing showed that with the addition of white turmeric extract inhibitor concentration, the corrosion rate will decrease and the value of inhibition efficiency increases with the highest value is 70,5 , whereas with the addition of purple sweet potato extract inhibitor concentration decreasing with efficiency value maximum inhibition of 15.09.
However, potentiodinamic polarization test results for a 400 ppm white turmeric extract inhibitor added with purple java extract showed an increasing rate of corrosion rate. The results of the EIS test show that these two inhibitors can protect the metal by forming a film coating that coats the metal surface. The mechanism of adsorption inhibitor shows as a physical and chemical adsorption mechanism and is in accordance with the model of Langmuir.
"
Depok: Fakultas Teknik Universitas Indonesia, 2018
T51633
UI - Skripsi Membership  Universitas Indonesia Library
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Brahmantia Brava Prajitno
"Inhibisi merupakan salah satu metode penghambatan laju korosi, salah satu jenis dari inhibitor adalah inhibitor organik yang memiliki sifat biodegradable sehingga bersifat lebih ramah lingkungandan relatif lebih murah dibandingkan inhibitor anorganik.Penelitian ini dilakukan untuk mempelajari perilaku inhibisi dari campuran ekstrak melinjo dan kunyit pada pipa baja API-5L di lingkungan NaCl 3,5% dengan menggunakan metode kehilangan berat dan polarisasi.
Dalam penelitian ini variasi kadar ekstrak melinjo dan kunyit dicampur dengan berbagai kadar. Sebagai single inhibitor melinjo menghasilkan efisiensi yang lebih tinggi dari sebagian besar kadar campuran. Pada percobaan polarisasi efisiensi terbaik ada pada campuran 6 ml kedua ekstrak dengan acampuran 8 ml kedua ekstrak sebagai efisiensi kedua terbaik.

Inhibition is one of corrosion protection method, one kind of corrosion inhibitor is organic inhibitor which has biodegradable characteristic thus the inhibitor is environmental friendlier than conventional inorganic inhibitor. This research was done to study the inhibition activity of combination between melinjo and turmeric extract for API-5L steel pipe in NaCl 3,5% environment. Weight loss and polarization method were used to measure the inhibitor efficiency.
In this study concentration of melinjo extract and turmeric extract were varied.It was found that as a single inhibitor melinjo extract has more efficiency than the combination inhibitor. In polarization method it was found that the combination of 6 ml of the two extract has the highest efficiency followed by the combination of 8ml.
"
Depok: Fakultas Teknik Universitas Indonesia, 2015
S59628
UI - Skripsi Membership  Universitas Indonesia Library
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Sendangratri
"Ubi jalar Ipomoea batatas L. varietas ungu, orange, dan putih dapat dibedakan berdasarkan warna kulit dan daging umbinya. Penelitian aktivitas antiinflamasi oleh tanaman ini masih terbatas meskipun telah dimanfaatkan secara tradisional. Penelitian ini bertujuan untuk mengetahui nilai IC50 ekstrak umbi Ipomoea batatas L. dalam menghambat aktivitas lipoksigenase. Simplisia umbi ubi jalar diekstraksi dengan metode maserasi menggunakan pelarut etanol 70. Masing-masing ekstrak diuji penghambatannya terhadap aktivitas lipoksigenase dan dilakukan penapisan fitokimia serta penetapan kadar flavonoid total. Nilai IC50 dan kadar flavonoid total yang diperoleh dari masing-masing ekstrak dianalisis hubungannya menggunakan software SPSS versi 22.0.
Hasil uji penghambatan aktivitas lipoksigenase menunjukkan bahwa nilai IC50 ekstrak umbi ubi jalar ungu, orange, putih berturut-turut adalah 46,09; 52,12; dan 63,69 g/mL. Pada penapisan fitokimia diketahui bahwa ketiga ekstrak mengandung golongan senyawa alkaloid, flavonoid, saponin, tanin, dan glikosida. Kadar flavonoid total dalam ekstrak ubi jalar ungu, orange, dan putih berturut-turut adalah 8,45 0,41; 7,57 0,03; dan 6,12 0,14 mgQE/g ekstrak. Kadar flavonoid total dan nilai IC50 ketiga ekstrak saling berhubungan kuat dan berbanding terbalik dengan nilai signifikansi 0,026 dan korelasi -0,999 yang menunjukkan bahwa semakin tinggi kadar flavonoid total maka semakin rendah IC50.

Sweet potatoes Ipomoea batatas L. with purple, orange, and white varieties can be differentiated by their skin and flesh tubers rsquo colors. Research on anti inflammatory activity of this plant is still limited although has been used traditionally. This study aims to determine IC50 value of sweet potato tubers extract in inhibiting lipoxygenase activity. Dried tubers of sweet potato were extracted by maceration with ethanol 70 . Each extracts were tested for lipoxygenase inhibitory activity, phytochemical screening, and total flavonoid content. IC50 and total flavonoid content obtained from each extracts were analyzed using SPSS version 22.
IC50 value of purple, orange, and white sweet potato tuber extract were 46.09, 52.12, and 63.69 g mL. Phytochemical contents of each extracts contain alkaloids, flavonoids, saponins, tannins, and glycosides. Total flavonoid content in purple, orange and white sweet potato extracts are 8.45 0.41 7.57 0.03 and 6.12 0.14 mgQE g extract. Total flavonoid contents and IC50 values of each extracts are strongly correlated and inversely proportional with significance value 0.026 and correlation value 0.999 which indicate that the higher the total flavonoid contents the lower the IC50.
"
Depok: Fakultas Farmasi Universitas Indonesia, 2018
S-Pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Gracio Plorentino
"Ubi ungu mempunyai senyawa antosianin yang merupakan suatu antioksidan. Sifat ubi ungu yang ramah lingkungan, murah, dan mudah didapat menjadikan ubi ungu berpotensial untuk menjadi salah satu inhibitor untuk menggantikan inhibitor lain yang bersifat tidak ramah lingkungan dalam lingkungan NaCl 3,5% pada lembaran baja karbon rendah. Metode kehilangan berat digunakan dalam penelitian kali ini, dengan menggunakan variasi lama waktu pengujian (3,6,9, dan 12 hari) dan penggunaan inhibitor X sebanyak 2 ml. Hasil yang didapat cukup baik dimana efisiensi tertinggi didapat pada waktu pengujian 9 hari dengan efisiensi 37,16%.

Anthocyanin from sweet potatoes acts as an antioxidant, the caracteristics of antosianin which is environmental friendly, inexpensive, and easy to get makes sweet potatoes very potential to become one of an organic inhibitor to replace other inhibitor that are not environmental friendly in 3.5% NaCl environment at low carbon steel plate. Weight loss method used in this study, using a variety of testing time (3,6,9, and 12 days) and the use of inhibitors X is 2 ml. The result is good enough where the highest efficiency obtained at the time of testing 9 days with 37.16% efficiency."
Depok: Fakultas Teknik Universitas Indonesia, 2011
S163
UI - Skripsi Open  Universitas Indonesia Library
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Rizka Fitriana
"Berbagai metode telah dikembangkan dalam mendeteksi kesegaran susu, metode kolorimetri berupa label indikator merupakan pengembangan metode terbaru yang sederhana. Label indikator ini didesain untuk merespon zat kimia uap asam yang dihasilkan oleh susu sebagai hasil dari pembusukan atau kerusakan akibat mikroorganisme yang dapat dilihat dari perubahan warna labelnya. Label terbuat dari ekstrak ubi ungu dan kertas saring whatman nomor 1. Pendeteksian kesegaran susu ini dilakukan dengan pengujian uap asam asetat dan pengujian langsung pada susu. Pada pengujian label dengan uap asam asetat dilihat pengaruh pH ekstrak pH 2, 7, dan 11 , konsentrasi 0 ?L/L, 100 ?L/L, 10.000 ?L/L, 100.000 ?L/L, dan 200.000 ?L/L , waktu deteksi 30 dan 90 menit , dan temperatur 4?C, 23?C, dan 40?C . Sedangkan uji label pada susu hanya dipengaruhi oleh pengaruh pH ekstrak dan suhu.
Hasil spektrum UV-Vis ekstrak ubi ungu pada pH 2-11 memperlihatkan perubahan warna dari merah muda ke hijau yakni dari puncak panjang gelombang 530 nm hingga 603 nm. Pada uji susu selama 48 jam, hasil menunjukkan bahwa label indikator pH=11 merupakan label yang paling baik dalam mendeteksi kesegaran susu dikarenakan perubahan warna yang dihasilkan signifikan yakni dari hijau menjadi krem kekuningan.
Maka kesimpulannya adalah semakin tinggi temperatur penyimpanan, maka semakin cepat susu menjadi basi ditandai dengan semakin asam susu tersebut pH semakin rendah , dan perubahan warna label yang semakin terang intensitas RGB total semakin tinggi . Hasil tersebut dapat diperkuat dengan pengukuran nilai pH susu setelah 48 jam diuji yakni pada suhu 4?C pH susu bernilai 6,60, pada suhu 23?C pH susu bernilai 6,00, dan pada suhu 40?C pH susu bernilai 5,28.

Various methods have been developed in detecting freshness of milk, the colorimetric method in the form of indicator label is the development of the newest simple method. This indicator label is designed to respond the chemicals acid gas produced by milk as a result of decay or damage caused by microorganisms growth that can be seen from the color change of the label. The label is made from purple sweet potato extract and whatman filter paper number 1. Detection freshness of milk is done by testing acetic acid gas and direct test on milk. In the label test with acetic acid gas, the effect of pH of extract pH 2, 7, and 11 , concentrations 0 L L, 100 L L, 10,000 L L, 100,000 L L and 200,000 L L , detection period 30 and 90 minutes , and temperature 4 C, 23 C, and 40 C are observed. While the label test on milk is only observed by the influence of pH of extract and temperature.
The UV Vis spectra of purple sweet potato extract in the pH range of 2 11 were studied and the color clearly change from pink to green that has wavelength peak from 530 nm to 603 nm. In the milk test for 48 hours, the results show that the indicator label pH 11 is the best label in detecting freshness of milk due to the significant color change from green to creamy yellowish.
Finally, the conclusion is that the higher the storage temperature, the faster the milk becomes spoilage, which is marked by the increasingly acidity level of milk the lower the pH and the lighter color changes of label the higher the total RGB intensity . That statement can be strengthened by measuring the pH value of milk after 48 hours tested at a temperature 4 C the pH of milk is 6.60, at temperature 23 C the pH of milk is 6.00, and at temperature 40 C the pH of milk is 5.28
"
Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2017
S67716
UI - Skripsi Membership  Universitas Indonesia Library
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Achmad Fachri Nr
"Korosi merupakan salah satu permasalahan penting yang harus dihadapi oleh berbagai macam sektor industri di Indonesia. Korosi memberikan efek dari segi ekonomi maupun dari segi keselamatan kerja. Salah satu cara pencegahan dan pengendalian korosi adalah dengan penambahan inhibitor.
Ubi Ungu sebagai bahan organik dapat dikembangkan sebagai inhibitor untuk mengurangi laju korosi untuk baja karbon rendah di lingkungan air laut. Ubi ungu diharapkan dapat dijadikan sebagai inhibitor yang bersifat aman, ramah lingkungan, serta bio-degradable dan juga dapat mengurangi penggunaan bahan sintetis. Metode kehilangan berat digunakan untuk menguji keefektifan ubi ungu sebagai inhibitor dengan variasi konsentrasi (2ml, 4ml, 6ml) dan lama perendaman selama 4 hari.
Dalam penelitian ini dapat disimpulkan ubi ungu bekerja kurang baik baik dilingkungan air laut karena terjadi efisiensi yang didapat relative kecil sehingga kurang cocok digunakan sebagai inhibitor. Efisien rata-rata dari ke-3 konsentrasi tersebut diperoleh sekitar 13,20%, dengan maksimum nilai efisiensi terjadi pada konsentrasi 2ml yaitu sebesar 21,02%.

Corrosion is one important problem that must be faced by a variety of industrial sectors in Indonesia. Corrosion effect in terms of economic and in terms of safety. One way of prevention and corrosion control is by the addition of inhibitors.
Sweet potatoes as the organic material can be developed as an inhibitor to reduce corrosion rates for low carbon steel in sea water environment. Purple sweet potatoes are expected to serve as safety inhibitors ,friendly environment, and biodegradable and also reduce the use of synthetic materials. Weight loss method is used to test the effectiveness of sweet violet as inhibitors with various concentration (2ml, 4ml, 6ml) and soaking for 4 days.
Conclusion of this study that sweat potato as green inhibitor work less well in the environment of sea water because of efficiencies gained relatively small, making it less suitable for use as an inhibitor. Efficient average of the 3 concentrations were obtained approximately 13.20%, with a maximum value of efficiency occurs at a concentration that is equal to 21.02% at 2ml.
"
Depok: Fakultas Teknik Universitas Indonesia, 2011
S42374
UI - Skripsi Open  Universitas Indonesia Library
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Felix Liyono
"Korosi sebagai penyebab utama kegagalan di industri migas dapat dicegah dengan menggunakan green inhibitor yang bersifat aman, mudah diperoleh, biodegradeable, murah, dan ramah lingkungan. Penelitian ini bertujuan untuk mengetahui kadar optimal campuran kedua ekstrak ubi ungu dan melinjo untuk melindungi baja API 5L di lingkungan NaCl 3,5% dengan metode kehilangan berat dan polarisasi. Kedua green inhibitor dipilih karena mengandung senyawa antioksidan yang dapat menghambat laju korosi. Hasil penelitian menunjukkan bahwa kedua inhibitor yang digunakan anti-sinergis dimana kebanyakan variasi kadar pencampuran melindungi sampel kurang baik dibandingkan dengan salah satu inhibitor tersebut. Pencampuran 6 ml kedua ekstrak menghasilkan perlindungan maksimal terhadap korosi.

Corrosion as the main cause of material failure in oil industries can be prevented with green inhibitors, which are easily accessible, biodegradable, cheap and environmental friendly. This research is intended to determined the optimal mixing concentration of both purple sweet potato and melinjo extract in protecting API 5L steel in NaCl 3,5% environment by weight loss and polarization tests. These inhibitors are selected as they contain antioxidants to decrease corrosion rate. The results of the research conclude that these inhibitors not anti-synergic as most of the mixing concentration provide worse protection against corrosion than either one of the inhibitors. The optimal mixing concentration is both extracts at 6 ml."
Depok: Fakultas Teknik Universitas Indonesia, 2015
S58457
UI - Skripsi Membership  Universitas Indonesia Library
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Ayende
"[ABSTRAK
Penelitian pemanfaatan ekstrak tumbuh-tumbuhan sebagai inhibitor korosi
belakangan ini semakin meningkat seiring dengan meningkatnya permintaan
penggunaan bahan-bahan kimia yang ramah lingkungan. Pemanfaatan ekstrak
tumbuh-tumbuhan sebagai inhibitor korosi menjadi penting mengingat
karakteristiknya ramah lingkungan (green inhibitor), mudah ketersediaannnya,
sumberdaya yang melimpah dan dapat diperbaharui, prosedur produksi yang
sederhana, dan biaya produksi yang cukup kompetitif. Dalam penelitian ini
dilakukan pengujian eksperimental efek sinergis jenis inhhibitor baru yaitu
ekstrak ubi ungu (Ipomoea batatas L.) yang memiliki kandungan utama
antosianin dengan inhibitor komersial berbasis amine (aniline) dan dengan
inhibitor asam askorbat.
Penelitian bertujuan untuk menganalisis laju kororsi dan efisiensi inhibisi
korosi logam baja (API 5L) di dalam lingkungan air terproduksi menggunakan
inhibitor campuran ekstrak ubi ungu dan inhibitor komersial berbasis amine
(aniline). Selain itu dilakukan pula analisis laju korosi, efisiensi inhibisi,
mekanisme proteksi dan model lapisan inhibisi korosi logam baja (API 5L) di
dalam lingkungan 3,5% NaCl menggunakan inhibitor campuran ekstrak ubi ungu
dan asam askorbat.
Metode pengukuran laju korosi dan efisiensi inhibisi dilakukan
menggunakan elektrokimia kurva polarisasi. Mekanisme korosi diteliti dengan
menggunakan metode Electrochemical Impedance Spectroscopy (EIS). Untuk
menganalisis model lapisan inhibisi dilakukan dengan menggunakan metode
Fourier Transform Infra Red (FTIR) spectroscopy.
Hasil penelitian menunjukan bahwa pencampuran ekstrak ubi ungu
memiliki kemampuan sinergis dengan inhibitor komersial berbasis amine (aniline)
pada fraksi volume ekstrak ubi ungu sebesar 25% dengan menghasilkan efisiensi
inhibisi sebesar 82,14%. Sebagai pembanding, pada sistem yang sama
penggunaan esktrak ubi ungu saja menghasilkan efisiensi inhibisi 68,30%,
sedangkan penggunaan inhibitor komersial berbasis amine (aniline) saja
menghasilkan efisiensi inhibisi 74,88%.
Penambahan volume ekstrak ubi ungu dari 1 mL hingga 4 mL kedalam
inhibitor asam askorbat 10-4 M meningkatkan efisiensi inhibisi korosi logam baja
(API 5L) dalam larutan 3,5% NaCl dari efisiensi inhibisi sebesar 23,37% menjadi
57,52%. Campuran inhibitor korosi tersebut berpengaruh terhadap kurva
polarisasi anodik maupun katodik sehingga dapat berperan sebagai mixed
inhibitor. Pengujian EIS menunjukan proses korosi dikontrol oleh mekanisme
pasivasi yang ditunjukan oleh adanya peningkatan tahanan permukaan korosi.
Pada lapisan permukaan terjadi proses adsorpsi dan pembentukan kelat
organo (flavonoid) logam dimana ekstrak ubi ungu dengan kandungan utama
antosianin berperan sebagai pembentuk metal-chelated. Pembentukan kelat
ekstrak ubi ungu-Fe-asam askorbat terjadi pada gugus hidroksil dan karbonil.
Lokasi terjadinya ligan kelat ekstrak ubi ungu dengan kandungan utma antosianin
terjadi pada ikatan 3?, 4? Dihydroxy cincin B atau 3-Hydroxy 4-Carbonyl cincin C;

ABSTRACT
Research of utilization of plant extracts as a corrosion inhibitor recently
increased along with the increasing demand for the use of chemicals that are
environmentally friendly. Utilization of plant extracts as a corrosion inhibitor
becomes important given the characteristics of environmentally friendly (green
inhibitor), easy availability, resources are abundant and renewable, the production
procedure is simple, and the production costs are quite competitive. In this
research, experimental testing of the synergistic effects of new types inhibitor ie
extract purple potato (Ipomoea batatas L.) which has the main content of
anthocyanin with commercial inhibitor-based amine (aniline) and with ascorbic
acid inhibitors.
The study aims to analyze the rate of corrosion and metal corrosion
inhibition efficiency of steel (API 5L) in the produced water environment using a
mixed inhibitor purple sweet potato extract and commercial-based inhibitors of
amine (aniline). In addition, the corrosion rate analysis was also performed,
inhibition efficiency, protection mechanisms and models of metal corrosion
inhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixed
inhibitor purple sweet potato extract and ascorbic acid.
Method of measuring the rate of corrosion and inhibition efficiency was
performed using electrochemical polarization curves. Corrosion mechanisms
investigated by Electrochemical Impedance Spectroscopy (EIS). To analyze the
model layer of inhibition were calculated using Fourier Transform Infra Red
(FTIR) spectroscopy.
The results showed that mixing purple sweetpotato extract has the ability
to synergistically with commercial inhibitor-based amine (aniline) in purple
sweetpotato extract volume fraction of 25% with a yield of 82.14% inhibition
efficiency. For comparison, the same system using purple sweet potato extract
only produce inhibition efficiency of 68.30%, while the use of commercial-based
inhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.
The addition of purple sweet potato extract volume of 1 mL to 4 mL into
ascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibition
efficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%
to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodic
polarization curves so that it can act as a mixed inhibitor. Testing EIS shows the
corrosion process is controlled by the passivation mechanism indicated by an
increase in the surface resistance of corrosion.
On the surface layer of a process of adsorption and formation of organo
chelates (flavonoids) in which the metal purple sweet potato extract with the main
content of anthocyanins act as forming metal-chelated. Location of the chelating
ligand purple sweet potato extract with the main content of anthocyanins occur in
bond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C.;Research of utilization of plant extracts as a corrosion inhibitor recently
increased along with the increasing demand for the use of chemicals that are
environmentally friendly. Utilization of plant extracts as a corrosion inhibitor
becomes important given the characteristics of environmentally friendly (green
inhibitor), easy availability, resources are abundant and renewable, the production
procedure is simple, and the production costs are quite competitive. In this
research, experimental testing of the synergistic effects of new types inhibitor ie
extract purple potato (Ipomoea batatas L.) which has the main content of
anthocyanin with commercial inhibitor-based amine (aniline) and with ascorbic
acid inhibitors.
The study aims to analyze the rate of corrosion and metal corrosion
inhibition efficiency of steel (API 5L) in the produced water environment using a
mixed inhibitor purple sweet potato extract and commercial-based inhibitors of
amine (aniline). In addition, the corrosion rate analysis was also performed,
inhibition efficiency, protection mechanisms and models of metal corrosion
inhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixed
inhibitor purple sweet potato extract and ascorbic acid.
Method of measuring the rate of corrosion and inhibition efficiency was
performed using electrochemical polarization curves. Corrosion mechanisms
investigated by Electrochemical Impedance Spectroscopy (EIS). To analyze the
model layer of inhibition were calculated using Fourier Transform Infra Red
(FTIR) spectroscopy.
The results showed that mixing purple sweetpotato extract has the ability
to synergistically with commercial inhibitor-based amine (aniline) in purple
sweetpotato extract volume fraction of 25% with a yield of 82.14% inhibition
efficiency. For comparison, the same system using purple sweet potato extract
only produce inhibition efficiency of 68.30%, while the use of commercial-based
inhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.
The addition of purple sweet potato extract volume of 1 mL to 4 mL into
ascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibition
efficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%
to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodic
polarization curves so that it can act as a mixed inhibitor. Testing EIS shows the
corrosion process is controlled by the passivation mechanism indicated by an
increase in the surface resistance of corrosion.
On the surface layer of a process of adsorption and formation of organo
chelates (flavonoids) in which the metal purple sweet potato extract with the main
content of anthocyanins act as forming metal-chelated. Location of the chelating
ligand purple sweet potato extract with the main content of anthocyanins occur in
bond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C., Research of utilization of plant extracts as a corrosion inhibitor recently
increased along with the increasing demand for the use of chemicals that are
environmentally friendly. Utilization of plant extracts as a corrosion inhibitor
becomes important given the characteristics of environmentally friendly (green
inhibitor), easy availability, resources are abundant and renewable, the production
procedure is simple, and the production costs are quite competitive. In this
research, experimental testing of the synergistic effects of new types inhibitor ie
extract purple potato (Ipomoea batatas L.) which has the main content of
anthocyanin with commercial inhibitor-based amine (aniline) and with ascorbic
acid inhibitors.
The study aims to analyze the rate of corrosion and metal corrosion
inhibition efficiency of steel (API 5L) in the produced water environment using a
mixed inhibitor purple sweet potato extract and commercial-based inhibitors of
amine (aniline). In addition, the corrosion rate analysis was also performed,
inhibition efficiency, protection mechanisms and models of metal corrosion
inhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixed
inhibitor purple sweet potato extract and ascorbic acid.
Method of measuring the rate of corrosion and inhibition efficiency was
performed using electrochemical polarization curves. Corrosion mechanisms
investigated by Electrochemical Impedance Spectroscopy (EIS). To analyze the
model layer of inhibition were calculated using Fourier Transform Infra Red
(FTIR) spectroscopy.
The results showed that mixing purple sweetpotato extract has the ability
to synergistically with commercial inhibitor-based amine (aniline) in purple
sweetpotato extract volume fraction of 25% with a yield of 82.14% inhibition
efficiency. For comparison, the same system using purple sweet potato extract
only produce inhibition efficiency of 68.30%, while the use of commercial-based
inhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.
The addition of purple sweet potato extract volume of 1 mL to 4 mL into
ascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibition
efficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%
to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodic
polarization curves so that it can act as a mixed inhibitor. Testing EIS shows the
corrosion process is controlled by the passivation mechanism indicated by an
increase in the surface resistance of corrosion.
On the surface layer of a process of adsorption and formation of organo
chelates (flavonoids) in which the metal purple sweet potato extract with the main
content of anthocyanins act as forming metal-chelated. Location of the chelating
ligand purple sweet potato extract with the main content of anthocyanins occur in
bond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C.]"
Depok: Fakultas Teknik Universitas Indonesia, 2014
D1871
UI - Disertasi Membership  Universitas Indonesia Library
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Faishal Farras Yanfaunnas
"ABSTRACT
Dengue virus infection (DENV) is a disease that is still widely available in Indonesia. In Southeast Asia alone the number of cases can reach more than 250,000 cases per year. Until now there is no effective vaccine for this disease. Therefore, research into the development of antivirus DENV continues to be done. One of them is research on mengani potential of white sweet potato leaf extract. White sweet potatoes contain various phenolic acids which can be used as antiviral DENV. Ethanol extract of white sweet potato leaves has been obtained by LIPI. Testing for antivirus uses huh7-it cells that have been incubated with DENV-2 NGC strains which were treated variously extract concentrations of 320, 160, 80, 40, 20, 10 μg / mL. The focus assay test is used to determine the IC50 value, while the MTT assay is used to get the CC50 value. SI values ​​are obtained by comparing CC50 and IC50 values. Data analysis was performed using the normality test and non-parametric test. The results showed the value of CC50, IC50, and The selectivity index of the extract was 123.76 μg / mL, 4.42 μg / mL, and 28.9. High SI values ​​indicate that White Sweet Potato Extract has the potential to be a good candidate as a DENV antivirus. Future research needs to be done to see the pure compound from this extract which has the potential as an antiviral.

ABSTRAK
Virus dengue (DENV) merupakan salah sau penyakit yang masih banyak terdapat di Indonesia. Di asia tenggara sendiri jumlah kasus bisa mencapai lebih dari 250.000 kasus per tahun. Hingga saat ini belum terdapat vaksin yang efektif untuk penyakit ini. Oleh sebab itu maka penelitian pengembangan antivirus DENV terus dilakukan. Salah satunya yaitu penelitian mengani potensi ekstrak daun ubi jalar putih. Ubi jalar putih mengandung berbagai asam fenolat yang dapat dimanfaatkan sebagai antiviral DENV. Ekstrak etanol daun ubi jalar putih telah didapat oleh LIPI. Pengujian untuk antivirus menggunakan sel huh7-it yang telah diinkubasi dengan DENV-2 Strain NGC yang diberi perlakuan berbagai konsenstrasi ekstrak yaitu 320, 160, 80, 40, 20, 10 μg/mL. Uji focus assay digunakan untuk menentukan nilai IC50, sedangkan MTT assay digunakan untuk mendapatkan nilai CC50. Nilai SI didapatkan dengan dilakukan perbandingan antara nilai CC50 dengan IC50. Analisis data dilakukan dengan menggunakan uji normality test dan non-parametrik test. Hasil penelitian menunjukkan nilai CC50, IC50, dan
Selectivity Index dari ekstrak adalah 123.76 μg/mL, 4.42 μg/mL, dan 28.9. Niali SI yang tinggi menunjukkan bahwa Ekstrak Ubi Jalar Berwana Putih mempunyai potensi sebagai kandidat yang baik sebagai antivirus DENV. Penelitian kedepan perlu dilakukan untuk melihat senyawa murni dari ekstrak ini yang berpotensi sebagai antivirus."
2017
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UI - Skripsi Membership  Universitas Indonesia Library
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