The Phytochemistry and Antioxidant Activity of the Ethanol Extract of Cymbopogon citratus (POACEAE) (original) (raw)
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Phytochemicals as Green Corrosion Inhibitors in Various Corrosive Media: A Review
Tanzania Journal of Science, 2009
There is an intensive effort underway to develop new plant origin corrosion inhibitors for metal subjected to various environmental conditions. These efforts have been motivated by the desire to replace toxic inhibitors used for mitigation of corrosion of various metals and alloys in aqueous solutions. Plants represent a class of interesting source of compounds currently being explored for use in metal corrosion protection in most systems, as possible replacement of toxic synthetic inhibitors. In this review article, research results on the use of eco-friendly phytochemicals as corrosion inhibitors have been summarized. A general introduction to the topic of corrosion mitigation by inhibitors is presented followed by extensive literature survey on the use of natural inhibitors for corrosion control of metals and alloys in different corrosive media.
A critical review on green corrosion inhibitors based on plant extracts: Advances and potential presence in the market, 2021
Corrosion occurs in all sectors including oil pipelines, drinking water and sewerage in the majority of cases linked to corrosion of steel. Good corrosion management includes optimising corrosion control actions and minimising lifecycle corrosion costs whilst meeting environmental goals. The toxicity of commonly used synthetic inhibitors are the subject of recent legislations (REACH and PARCOM) have led to search on more eco-friendly corrosion inhibitors. Extensive research is conducted to assess the corrosion inhibition rate of diverse green inhibitors. However, it was not adequately recommended for widespread use furthermore, presenting at the business level. This paper critically reviews green plant extracts corrosion inhibitors with a particular emphasis on their efficiency. In addition, a comprehensive list of potentially effective plant extracts has been compiled. Also, the successful use of naturally occurring substances to inhibit the corrosion of metals in acidic and alkaline environment has been investigated. The results showed that the corrosion rate of mild steel in 1 M HCl and 0.5 M H2SO4 decreases with the increase in concentration of the banana extracts. In conclusion, corrosion inhibitors based on plant extracts represent a reliable economic eco-friendly alternative for corrosion inhibition based on their availability and efficiency. The challenges toward the commercial application of green inhibitors have been drawn from the literature.
Romanian …, 2011
The aim of this study was the obtaining and chemical characterization of some vegetal extracts utilizable for the obtaining of new eco-friendly anti-corrosion/anti-scaling products. Therefore, starting from the fact that antioxidant activity is one of the main properties of these products and that the polyphenol class contains some of the safest and effective antioxidant compounds, firstly some indigenous species were selected, with high content of flavonoids and phenyl-carboxylic acid derivates. Consequently, five raw materials were proposed: leaves of Fagus sylvatica L. and Juglans regia L., aerial part of Agrimonia eupatoria L. and Lithrum salicaria L. and scales of Alii cepae L. bulbus, respectively. More, the obtaining of whole and selective vegetal extracts was also projected. As concerning present work (Part I. Fagus sylvatica and Alii cepae bulbus extracts), qualitative analytical studies (HPTLC method) made on beech leaves extracts certified the presence of both, flavonoids and phenyl-carboxylic acid derivates: proved kaempferol, apigenin, quercetin, catechin and caffeic acid derivates. Added, quantitative analysis made on each, whole and selective beech leaves extracts indicated total phenols contents (Folin-Ciocalteau method) of 101mg% and 196mg%, respectively (expressed as caffeic acid equivalents) and total flavones contents (AlCl 3 in base medium method) of 36mg% and 50mg%, respectively (expressed as rutin equivalents) (g/v). Differently, onion scales extracts showed flavones derivates occurrence, only: confirmed quercetin and quercetin 4' derivates presence. Also, the two types of onion scales extracts showed total phenols contents of 155mg% and 333mg%, respectively (expressed as caffeic acid equivalents) and total flavones contents of 114mg% and 228mg%, respectively (expressed as quercetin equivalents) (g/v). Studies regarding antioxidant potential of these vegetal extracts (used chemiluminescence method in luminol/H 2 O 2 system) emphasized onion scales extracts as being more active than beech leaves extract and selective extracts as more effectively than correspondingly whole extracts. Accordingly, corrosion/scaling inhibition tests confirmed both; onion scales extracts superiority as well as selective extracts effectiveness.
An overview on plant extracts as potential green corrosion inhibitors for metals and alloys
2020
Metal corrosion is a phenomenon that has existed for a long time. Considering the economic losses caused by this phenomenon; different protection techniques are used, such as corrosion inhibitors which can be harmful to the environment. Reduced environmental risk, lower cost, wide spread availability and high corrosion inhibition effectiveness make the plant extracts as suitable candidates to replace the expensive and toxic traditional synthetic corrosion inhibitors. Literature survey reveals that different extracts issued from leaf, root, stem, bark, pulp, fruit, etc. have been effectively proposed as sustainable inhibitors for the corrosion of different metallic materials. This review article aims to demonstrate the use of new corrosion inhibitors based on extract or an oil natural plant, which is biodegradable and eco-friendly substances, called "green inhibitors" and describes the collection of published work that has been carried out on the topic: plant extract as cor...
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Inhibition of corrosion of mild steel in hydrochloric acid by natural plant leaves extract of of Bahunia Varigata (Aapta), Azadirachta Indica (Neem), Pongamia Pinnata (Karanj), Santalum Album (Sandal Wood) and Astonia Scholaris (Saptparni) has studied using weight loss measurement. It was, found that the leaves extract act as a good corrosion inhibitor for mild steel in all concentrations of the extract. The inhibition action depends on the concentration of the leaves extract in the acid solution. Results for weight loss measurements indicate that inhibition efficiency increase with increasing inhibitor concentration. Extract of natural plants is one of the most important metallic corrosion inhibitors. They are readily available, nontoxic, environmentally friendly, biodegradable, highly efficient, and renewable. Several organic compounds with heteroatom such as N, O, S and P present in the plant extracts are, adsorbed directly onto the metals surface through polar atoms and thereby forming the protective layer. Plants represent a class of interesting source of compounds currently being, explored for use in metal corrosion protection in most systems, as possible replacement of toxic synthetic inhibitors. This paper discusses the different types of natural green plant leaves extract inhibitors for corrosion control of mild steel in acid medium.
The aim of this study was the obtaining and chemical characterization of some vegetal extracts utilizable for the obtaining of new eco-friendly anti-corrosion/anti-scaling products. Therefore, starting from the fact that antioxidant activity is one of the main properties of these products and that the polyphenol class contains some of the safest and effective antioxidant compounds, firstly some indigenous species were selected, with high content of flavonoids and phenyl-carboxylic acid derivates. Consequently, five raw materials were proposed: leaves of Fagus sylvatica L. and Juglans regia L., aerial part of Agrimonia eupatoria L. and Lithrum salicaria L. and scales of Alii cepae L. bulbus, respectively. More, the obtaining of whole and selective vegetal extracts was also projected. As concerning present work (Part I. Fagus sylvatica and Alii cepae bulbus extracts), qualitative analytical studies (HPTLC method) made on beech leaves extracts certified the presence of both, flavonoids...
SHS Web of Conferences
This paper presents a comparative study about the evaluation of antioxidant activity and corrosion inhibition in Kenitra, Marrakesh and Taiz. An interesting topic, indeed polyphenols can improve or help to reduce oxidative stress in the treatment of digestive problems, weight management difficulties, diabetes, hypertension, arteriosclerosis and damage fatty tissue. Therefore, the authors deal with the measurement of polyphenol content and evaluation of the antioxidant activity of lemon peels in Kenitra , Marrakesh and Taiz.The authors performs empirical analyzes on lemon peels. The total polyphenol contents of the ethanolic extract of lemon peels were measured. It was to be 30. 23, 26. 346 and 20.961 mg/CE/g in Kenitra, Marrakech, and Taiz, respectively. Moreover, the DPPH radical scavenging activity of ethanolic extract of dried lemon peels was higher than 200μg/ml concentration. They were 73.47%, 47.36%, and 32.09in Kenitra, Marrakech, and Taiz, respectively. Also, the IC50 values...
American Journal of Physical Chemistry, 2019
This study was aimed at investigating the influence of different drying methods on the photochemical composition and inhibition efficiency of Alchornea laxiflora and Muccuna flagellepes leaves extracts in corrosion prevention. The fresh samples of the leaves were collected, sorted, dried using two different drying methods viz; air drying and sun drying methods. The dried plant samples were ground separately sieved using 0.25µm and then extracted with ethanol using maceration method and then concentrated the filtrate in a water bath at 600C to obtained air dried Alchornea laxiflora leaves (AALL), air dried Mucunna flagellepes leaves (AMFL), sun dried Alchornea laxiflora leaves (SALL) and sun dried Muccuna flagellepes leaves (SMFL) extracts. The extract of each sample was analyzed separately for their phytochemical constituents using appropriate methods. From the results, there was variation in the composition in respect of the phytochemical of interest but it could be concluded that the drying methods have little effect on the phytochemical composition of the studied plant but air drying methods could be adopted as it gave highest content (AALL: Sapolin 45.55 mg/g, tannin 10.58mg/g, flavnoid 7.49mg/g, Terpenoid 7.06 mg/g, Alkaloid 35.61mg/g, phytobalatin 2.43mg/g and cardiac glycoside 4.72mg/g; AMFL: Sapolin 28.55mg/g, Tannin 5.39 mg/g, Flavnoid 6.42 mg/g, Terpenoid 5.94 mg/g, Alkaloid 4.53mg/g, Cardiac glycoside 6.33 mg/g; SALL: Saponin 20.00mg/g, Tannin 4.04 mg/g, Flavnoid 1.91 mg/g, Terpenoid 6.03 mg/g, Alkaloid 12.56 mg/g, Phytobalatin 2.57 mg/g, Cardiac glycoside 3.86mg/g: SMFL: Sapolin 15.00 mg/g, Tannin 3.82 mg/g, Terpenoid 4.82 mg/g, Alkaloid 6.25 mg/g and cardiac glycoside 4.93 mg/g. The corrosion inhibition efficiency of the samples extract on mild steel in 1.0M HCl solution was investigated using weight loss measurements. The weight loss measurement indicates an increase in corrosion inhibition efficiencies that reach 90.02% and 84.92% in AALL and AMFL extract and 79.74% and 72.12 in the SALL and SMFL extract respectively. The weight loss data established that the inhibition efficiency on mild steel increases with increase in the concentration of the plant extracts but decreased with increase in temperature. Thermodynamic parameters such as enthalpy change, entropy change, and activation energy were evaluated. Kinetics of the reaction in the presence of the extracts revealed that it follows a first order reaction and the half-life increased as the concentration of the extract increases.
Some Brassicaceae Extracts as Potential Antioxidants and Green Corrosion Inhibitors
Materials
Glucosinolates-rich extracts of some Brassicaceae sources, such as broccoli, cabbage, black radish, rapeseed, and cauliflower, were obtained using an eco-friendly extraction method, in a microwave field, with 70% ethanol, and evaluated in order to establish their in vitro antioxidant activities and anticorrosion effects on steel material. The DPPH method and Folin-Ciocâlteu assay proved good antioxidant activity (remaining DPPH, 9.54–22.03%) and the content of total phenolics between 1008–1713 mg GAE/L for all tested extracts. The electrochemical measurements in 0.5 M H2SO4 showed that the extracts act as mixed-type inhibitors proving their ability to inhibit corrosion in a concentration-dependent manner, with a remarkable inhibition efficiency (92.05–98.33%) achieved for concentrated extracts of broccoli, cauliflower, and black radish. The weight loss experiments revealed that the inhibition efficiency decreased with an increase in temperature and time of exposure. The apparent act...
Natural products as corrosion inhibitor for metals in corrosive media — A review
Materials Letters, 2008
The use of inhibitors for the control of corrosion of metals and alloys which are in contact with aggressive environment is an accepted practice. Large numbers of organic compounds were studied and are being studied to investigate their corrosion inhibition potential. All these studies reveal that organic compounds especially those with N, S and O showed significant inhibition efficiency. But, unfortunately most of these compounds are not only expensive but also toxic to living beings. It is needless to point out the importance of cheap, safe inhibitors of corrosion. Plant extracts have become important as an environmentally acceptable, readily available and renewable source for wide range of inhibitors. They are the rich sources of ingredients which have very high inhibition efficiency. This article gives a vivid account of natural products which are used as corrosion inhibitors for various metal and alloys in aggressive media.