Jatropha curcas leaves extract was tested as a green corrosion inhibitor for mild steel in aqueous hydrochloric acid solution using gravimetric and thermometric techniques. The results reveal that the inhibition efficiency vary with concentration of the leaf extract and the time of immersion. Maximum inhibition efficiency was found to be 95.92% in 2M HCl with 0.5 g/l concentration of the extract in gravimetric method, while 87.04% was obtained in thermometric method. The inhibiting effect was attributed to the presence of alkaloids, flavonoids, saponins, tannins and phenol in the extract. The adsorption processes of the Jatropha curcas leaves extract onto the mild steel is consistent with the assumptions of Langmuir isotherm model and also found to be spontaneous. From the results, a physical adsorption mechanism is proposed for the adsorption of Jatropha curcas leaves extract onto mild steel surface.

The Jatropha curcas L.، a plant belongs to Euphorbiaceae family، which has great economic and medicinally value. There is high amount of oil in seeds of this plant. Because of low germination ability of seed، propagation of Jatropha curcas via seed is not usual. The purpose of this work is optimizing of Jatropha curcas tissue culture for optimization of callus formation and propagation through micropropagation. The whole experiments were performed in complete Split- Factorial block design with nine replicates. In the current work the effect of different concentrations of 6-benzyladenine (BA) and indol-3-butyric acid (IBA) hormones (0، 0. 25، 0. 5، 1، 1. 5، 2، 3 mg/lit) in MS medium were investigated on callus and shoot formation on leaf، petiole stem and node explants. The results showed that the combination of BA and IBA is more effective for callus formation. The highest percentage of callus formation (90. 63%) was observed at 2 mg/lit BA and 1 mg/lit IBA in stem explants. The results showed that the highest percentage of shoot induction was observed at 0. 5 mg/lit BA and 0. 25 mg/lit IBA in node explants. Meanwhile our observations indicated that the root regeneration was happened equally at different concentrations، but the highest regenerated root number were observed after 0. 5 and 1mg/lit of IBA treatment. Finally، the obtained plants were transferred into soil medium.

A study was conducted in 2010 to investigate the effects of crude oil contaminatedsoil on biomass accumulation in Jatropha curcas seedlings in Asaba, Delta State, Nigeria. Oil levels used were 0.0, 2.0, 4.0, 6.0, 8.0 and 10.0% w/w. The trial was arranged in a randomized complete block design with four replications and monitored for 12 weeks after transplanting. Results showed that contamination of soil with crude oil significantly reduced (P≤0.05) biomass accumulation when compared with seedlings grown in the uncontaminated subplots. A negative interaction was observed between the soil crude oil level and weight gained in J. curcas seedlings. For instance, while the fresh weight of seedlings grown in 0.0% w/w of oil was 3.0g, as low as 2.1g was recorded for seedling exposed to 10.0g w/w of the oil. This study has demonstrated that crude oil contamination of soil has a significant effect of reducing the biomass accumulation in the seedlings of Jatropha crucas.

Combinatorial effects of aqueous root extract of Jatropha curcas (Jc) and J. gossypiifolia (Jg) in alloxan-induced diabetic rats was investigated in this research.
Thirty-six wistar rats were randomized into six groups of six animals each. Group I (control) was not induced but received 0.5 ml of distilled water. Groups II, III, IV, V and VI were induced with diabetes mellitus using alloxan monohydrate and received 14.2 mg/kg body weight (b/wt) glucophage, 0.5ml of distilled water, 250 mg/kg body weight of the root extracts of J. curcas, J. gossypiifolia and the combined extract respectively for 15 d.
The mixture of J. curcas and J. gossypiifolia in alloxan-induced diabetic rats resulted in significant reduction in the blood glucose between 39.7% reduction by day 3 and 73.3% reduction by day 13 (P The mixture of roots of J. curcas and J. gossypiifolia has a greater potential for effective antidiabetic activity compare with individual plant extracts and may be safe for consumption.

Non-edible vegetable oils have garnered significant research attention in recent years due to their enhanced tri-bological characteristics as biolubricants. Jatropha Curcas oil, in particular, shows promising potential as a feedstock for lubricant production. In this study, Jatropha biolubricant was synthesized through a two-step transesterification process: first converting Jatropha seed oil to methyl ester and then further transesterifying the methyl ester with sodium methoxide in the presence of ethylene glycol. The synthesis achieved a yield of 83.21-90% of Jatropha biolubricant using sodium methoxide as the catalyst. To enhance its performance, the synthesized biolubricant was blended with copper oxide (CuO) and zinc oxide (ZnO) as metal additives. Viscosity tests revealed that the blended biolubricant at 1 wt% additive concentration exhibited optimal viscosity characteristics: 52.952 cSt at 40 ℃ and 8.767 cSt at 100 ℃, compared to 31.58 cSt and 6.547 cSt, respectively, for the biolubricant without additives. Furthermore, blended biolubricant exhibited improved thermal degradation resistance and enhanced oxidative stability across different additive concentrations. Key lubricating properties such as pour point (10 ℃), viscosity at 40 ℃ (52.951 cSt), viscosity at 100 ℃ (8.767 cSt), and viscosity index (165.54) were analysed and found comparable to SAE 40 petroleum lubricants and other plant-based biolubricants.

Biodiesel is one of the major renewable energy sources, produced from vegetable oils. Jatropha curcas L. is considered as a promising energy crop for biodiesel production in Thailand. This study is about continuous biodiesel production from jatropha oil by transesterification in a flow process with microwave heating. Sodium methoxide was used as a catalyst at concentrations between 0.25%–1.5%, with microwave power of 800 W, irradiation time between 10–40 s, and oil to methanol molar ratio of 1:3–1:9, respectively. Results showed that jatropha oil can be converted to biodiesel (96.5%) within 30 s under oil/methanol molar ratio of 1:6 and 1.0% catalyst. The findings indicated that this method can offer alternative means to produce biodiesel continuously.

An ex-situ experiment to assess the metal extractive potential of fourteen agriculture plants (Vigna unguiculata, Gossypium hirsutum, Jatropha curcas, etc.) was conducted on Magnesite mines which had above permissible levels of Cadmium and Lead. There was no much difference in the total chlorophyll a and b, carbohydrate and protein contents in the plants grown in the mining soil and adjacent control area (farm soil). While considering the phytoextractive potential, among the 14 plants studied, V. ungiculata, O. sativa, S. bicolour, S. indium, R. communis, M. uniflorum, G. hirsutum and J. curcas contained considerable amount of heavy metals Cd and Pb other test plants. The experiment confirms that these plants have potential to accumulate the toxic trace elements from soil especially mining waste or dump. The subsequent confirmation studies on their metal tolerant index, metal transfer factor, translocation factor and MREI index values auger their potential phyto-extractive properties. The present study will pave way for in depth related studies in future.

Jatropha curcas is a tropical fast growing tree from euphorbiaceae family. The valuable species has medicinal، industrial and ornamental applications. Regeneration of the species was performed by seeds and cuttings. Regarding Jatropha''s seed nature (oily seed)، for which low germination is resulted، regeneration of the species was studied by stem cuttings. For micro propagation، apical buds of 2 and 4 years old genotypes̉̉̉ (Gen 1 and Gen 2) from different seasons were applied. The best treatment of sterilization was found to be HgCl2 0. 1% solution for 10 minutes on fall samples for genotype 2. The best medium for shoot proliferation was MS medium with BA (3 mg/l) and IBA (0. 1 mg/l). Effect of genotype on shooting was nonsense but genotype 2 had higher effect on growth factors. The most rooting of shoots was observed in modified MS medium supplemented with 1 mg/l of IBA. Plantlets were acclimated in greenhouse after transferring to soil.

Argentation column chromatography is a method used for separating similar molecules such as fatty acids which have slightly different stereochemistry. In this study, silver nitrate-impregnated silica gel was used as the adsorbent to isolate and purify Jatropha curcas oil fatty acids mixtures. The effects of silica gel, silver nitrate, adsorbent quantity, and fatty acid quantity on the purity and recovery percentage, as well as the ratio of linoleic acid to oleic acid, were investigated. The results showed that at the optimal condition of purification, the purity of linoleic acid increased from 38.4% to 78.7%. In the isolation process, linoleic acid adsorbed most strongly on the AgNO3/SiO2 adsorbent followed by oleic acid due to the greater number of the double bond and high ability to form polar charge-transfer complexes.

Water conservation is critical for both the natural environment and human development however, there is wastewater generation, particularly in the production of pulp, printing, leather, plastic, dye, and textile mills. Large-scale industrial wastewater purification necessitates the employment of low-cost adsorbents to lower the cost of large-scale industrial wastewater treatment procedures. In this study, the husk of Jatropha curcas (JHC) was carbonized, activated, and impregnate with ZnCl2 for use in batch tests to adsorb methylene blue (MB) from an aqueous solution. The effects of concentration, stirring speed, contact time, pH, and adsorbent dosage on adsorption isotherms and kinetics were examined. The Freundlich isotherm model accurately described the adsorption isotherm, while pseudo-second-order adequately fitted the kinetic data. The dye-loaded adsorbent could be regenerated by chemical regeneration after five desorption cycles. These findings suggested that JHC could be a good adsorbent for removing MB from wastewater and could help with industrial wastewater treatment.