scholarly journals Biocidal Activity of a Nanoemulsion Containing Essential Oil from Protium heptaphyllum Resin against Aedes aegypti (Diptera: Culicidae)

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6439
Author(s):  
Cleidjane Gomes Faustino ◽  
Fernando Antônio de Medeiros ◽  
Allan Kardec Ribeiro Galardo ◽  
Alex Bruno Lobato Rodrigues ◽  
Anderson Luiz Pena da Costa ◽  
...  
Keyword(s):  
Essential Oil ◽  
Aedes Aegypti ◽  
Aqueous Media ◽  
Hydrophilic Lipophilic Balance ◽  
Wide Range ◽  
Ovicidal Effect ◽  
Insecticidal Action ◽  
Air Interfaces ◽  
Optimal Effect ◽  
Protection Index

This work aimed to prepare a nanoemulsion containing the essential oil of the Protium heptaphyllum resin and evaluate its biocidal activities against the different stages of development of the Aedes aegypti mosquito. Ovicide, pupicide, adulticide and repellency assays were performed. The main constituents were p-cymene (27.70%) and α-pinene (22.31%). The developed nanoemulsion showed kinetic stability and monomodal distribution at a hydrophilic–lipophilic balance of 14 with a droplet size of 115.56 ± 1.68 nn and a zeta potential of −29.63 ± 3.46 mV. The nanoemulsion showed insecticidal action with LC50 0.404 µg.mL−1 for the ovicidal effect. In the pupicidal test, at the concentration of 160 µg.mL−1, 100% mortality was reached after 24 h. For adulticidal activity, a diagnostic concentration of 200 µg.mL−1 (120 min) was determined. In the repellency test, a concentration of 200 µg.mL−1 during the 180 min of the test showed a protection index of 77.67%. In conclusion, the nanobiotechnological product derived from the essential oil of P.heptaphyllumresin can be considered as a promising colloid that can be used to control infectious disease vectors through a wide range of possible modes of applications, probably as this bioactive delivery system may allow the optimal effect of the P. heptaphyllum terpenes in aqueous media and may also induce satisfactory delivery to air interfaces.

scholarly journals LARVICIDAL ACTIVITY OF CROTON RHAMNIFOLIOIDES(PAX HOFFM) ESSENTIAL OIL ENCAPSULATED IN A POLYMERIC NANOSYSTEM AGAINST THE MOSQUITO AEDES AEGYPTI

2020 ◽  
Vol 17 (34) ◽  
pp. 1-9
Author(s):  
Andréia Gregório da Silva SANTOS ◽  
Daniela do Amaral Ferraz NAVARRO ◽  
Nereide Stela Santos MAGALHÃES ◽  
Maria Alice Varjal MELO-SANTOS ◽  
Sofia Suely Ferreira BRANDÃO
Keyword(s):  
Essential Oil ◽  
Aedes Aegypti ◽  
Larvicidal Activity ◽  
Aqueous Suspension ◽  
New Products ◽  
Wide Distribution ◽  
Average Content ◽  
Plant Origin ◽  
Insecticidal Action ◽  
Time Of Collection

Aedes aegypti is a species of mosquito with wide distribution worldwide, involved in the cycles of transmission of dengue, Zika and chikungunya. The lack of vaccines for most of these arboviruses highlights the importance of vector control as a measure to reduce the incidence of these diseases. Several researches have been carried out in order to find substances of plant origin that are candidates for the control of A. aegypti. In this sense, medicinal plants that also have an insecticidal action have shown promise for the development of new products, environmentally safer than traditional chemical insecticides. The objective of this work was to evaluate the larvicidal activity of the essential oil of the leaves of Croton rhamnifolioides and its formulation in nanocapsules for A. aegypti. The essential oil was extracted by hydrodistillation and analyzed by gas chromatography coupled to a mass spectrometer (CG/MS). Formulations were produced containing concentrations of pure oil, which ranged from 40 to 80 μg/mL and polycaprolactone nanocapsules with concentrations from 30 to 120 μg/mL. Larvicide tests were performed using varying concentrations of an aqueous suspension, in triplicates, containing 20 larvae / concentration, in addition to an untreated control. As a result, the essential oil had an average content that varied between 1.4% and 0.58%, depending on the time of collection and, as main constituents, eucalyptol (16.57%) and (E) -cariophylene (11, 32%). LC50 values ranged from 26.3 μg/mL to 52.2 μg/mL and CL90 from 37.8 μg/mL to 68.7 μg/mL for pure oil. In encapsulated oil, the LC50 = 63.4 μg/mL and the LC90 = 104.8 μg/mL. The pure oil of Croton rhamnifolioides was considered more active against the larvae of A. aegypti than the encapsulated one, although both have great potential for application as a larvicide.

scholarly journals Larvicide Activity on Aedes aegypti of Essential Oil Nanoemulsion from the Protium heptaphyllum Resin

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5333
Author(s):  
Cleidjane Gomes Faustino ◽  
Fernando Antônio de Medeiros ◽  
Allan Kardec Ribeiro Galardo ◽  
Alex Bruno Lobato Rodrigues ◽  
Rosany Lopes Martins ◽  
...  
Keyword(s):  
Infectious Disease ◽  
Essential Oil ◽  
Aedes Aegypti ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Low Energy ◽  
Disease Vectors ◽  
Photon Correlation ◽  
Larvicidal Effect ◽  
Hydrophilic Lipophilic Balance

The aim of this work was to prepare a nanoemulsion containing the essential oil of Protium heptaphyllum resin and to evaluate the larvicidal activity and the residual larvicidal effect against Aedes aegypti. The essential oil was identified by gas chromatography coupled to a mass spectrometer, and the nanoemulsions were prepared using a low-energy method and characterized by photon correlation spectroscopy. The results indicated the major constituents as p-cimene (27.70%) and α-Pinene (22.31%). Nanoemulsions had kinetic stability and a monomodal distribution in a hydrophilic-lipophilic balance of 14 with particle diameters of 115.56 ± 1.68 nn and zeta potential of −29.63 ± 3.46 mV. The nanoemulsion showed larvicidal action with LC50 = 2.91 µg∙mL−1 and residual larvicidal effect for 72 h after application to A. aegypti larvae. Consequently, the nanobiotechnological product derived from the essential oil of P. heptaphyllum resin could be used against infectious disease vectors.

scholarly journals Development of larvicide nanoemulsion from the essential oil of Aeollanthus suaveolens Mart. ex Spreng against Aedes aegypti, and its toxicity in non-target organism

2021 ◽  
pp. 103148
Author(s):  
Rosany Lopes Martins ◽  
Alex Bruno Lobato Rodrigues ◽  
Érica Menezes Rabelo ◽  
Lizandra Lima Santos ◽  
Lethicia Barreto Brandão ◽  
...  
Keyword(s):  
Essential Oil ◽  
Aedes Aegypti

scholarly journals Plasmonic semiconductor nanogroove array enhanced broad spectral band millimetre and terahertz wave detection

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Jinchao Tong ◽  
Fei Suo ◽  
Tianning Zhang ◽  
Zhiming Huang ◽  
Junhao Chu ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
High Performance ◽  
Room Temperature ◽  
Spectral Band ◽  
High Capacity ◽  
Terahertz Wave ◽  
Semiconductor Surface ◽  
Wide Range ◽  
Low Sensitivity ◽  
Air Interfaces

AbstractHigh-performance uncooled millimetre and terahertz wave detectors are required as a building block for a wide range of applications. The state-of-the-art technologies, however, are plagued by low sensitivity, narrow spectral bandwidth, and complicated architecture. Here, we report semiconductor surface plasmon enhanced high-performance broadband millimetre and terahertz wave detectors which are based on nanogroove InSb array epitaxially grown on GaAs substrate for room temperature operation. By making a nanogroove array in the grown InSb layer, strong millimetre and terahertz wave surface plasmon polaritons can be generated at the InSb–air interfaces, which results in significant improvement in detecting performance. A noise equivalent power (NEP) of 2.2 × 10−14 W Hz−1/2 or a detectivity (D*) of 2.7 × 1012 cm Hz1/2 W−1 at 1.75 mm (0.171 THz) is achieved at room temperature. By lowering the temperature to the thermoelectric cooling available 200 K, the corresponding NEP and D* of the nanogroove device can be improved to 3.8 × 10−15 W Hz−1/2 and 1.6 × 1013 cm Hz1/2 W−1, respectively. In addition, such a single device can perform broad spectral band detection from 0.9 mm (0.330 THz) to 9.4 mm (0.032 THz). Fast responses of 3.5 µs and 780 ns are achieved at room temperature and 200 K, respectively. Such high-performance millimetre and terahertz wave photodetectors are useful for wide applications such as high capacity communications, walk-through security, biological diagnosis, spectroscopy, and remote sensing. In addition, the integration of plasmonic semiconductor nanostructures paves a way for realizing high performance and multifunctional long-wavelength optoelectrical devices.

scholarly journals Blue Tansy Essential Oil: Chemical Composition, Repellent Activity Against Aedes aegypti and Attractant Activity for Ceratitis capitata

2021 ◽  
Vol 16 (2) ◽  
pp. 1934578X2199019 ◽  
Author(s):  
Iris Stappen ◽  
Juergen Wanner ◽  
Nurhayat Tabanca ◽  
Ulrich R. Bernier ◽  
Paul E. Kendra
Keyword(s):  
Essential Oil ◽  
Aedes Aegypti ◽  
Ceratitis Capitata ◽  
Stationary Phases ◽  
Management Strategies ◽  
Fruit Fly ◽  
Effective Dosage ◽  
Mosquito Vector ◽  
Tea Tree ◽  
Potential Applications

Blue tansy essential oil (BTEO) ( Tanacetum annuum L.) was analyzed by GC-MS and GC-FID using two different capillary column stationary phases. Sabinene (14.0%), camphor (13.6%), myrcene (8.0%), β-pinene (7.7%), and chamazulene (6.9%) were the main components using an SE52 column (non-polar). On a polar CW20M phase column, sabinene (15.1%), camphor (14.4%), α-phellandrene (7.9%), β-pinene (7.7%), and myrcene (6.9%) were the most abundant compounds. To assess the oil for potential applications in integrated pest management strategies, behavioral bioassays were conducted to test for repellency against yellow fever mosquito Aedes aegypti, and for attractant activity for Mediterranean fruit fly Ceratitis capitata. Results showed that BTEO was not effective in repelling Ae. aegypti (minimum effective dosage [MED]: 0.625 ± 0.109 mg/cm2 compared with the standard insect repellent DEET (N,N-diethyl-3-methylbenzamide). In assays with male C. capitata, BTEO displayed mild attraction compared with two positive controls (essential oils from tea tree Melaleuca alternifolia and African ginger bush Tetradenia riparia). Additional studies are needed to identify the specific attractant chemicals in BTEO and to determine if they confer a synergistic effect when combined with other known attractants for C. capitata. To the best of our knowledge, this study represents the first investigation of BTEO for repellency against the mosquito vector Ae. aegypti and for attractancy to C. capitata, a major agricultural pest worldwide.

scholarly journals Ureido Functionalization through Amine-Urea Transamidation under Mild Reaction Conditions

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1583
Author(s):  
Natalia Guerrero-Alburquerque ◽  
Shanyu Zhao ◽  
Daniel Rentsch ◽  
Matthias M. Koebel ◽  
Marco Lattuada ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Reaction Times ◽  
Reaction Rates ◽  
Secondary Amines ◽  
Isocyanic Acid ◽  
Advantages And Disadvantages ◽  
Major Disadvantage ◽  
Wide Range ◽  
Potential Alternative ◽  
Full Conversion

Ureido-functionalized compounds play an indispensable role in important biochemical processes, as well as chemical synthesis and production. Isocyanates, and KOCN in particular, are the preferred reagents for the ureido functionalization of amine-bearing compounds. In this study, we evaluate the potential of urea as a reagent to graft ureido groups onto amines at relatively low temperatures (<100 °C) in aqueous media. Urea is an inexpensive, non-toxic and biocompatible potential alternative to KOCN for ureido functionalization. From as early as 1864, urea was the go-to reagent for polyurea polycondensation, before falling into disuse after the advent of isocyanate chemistry. We systematically re-investigate the advantages and disadvantages of urea for amine transamidation. High ureido-functionalization conversion was obtained for a wide range of substrates, including primary and secondary amines and amino acids. Reaction times are nearly independent of substrate and pH, but excess urea is required for practically feasible reaction rates. Near full conversion of amines into ureido can be achieved within 10 h at 90 °C and within 24 h at 80 °C, and much slower reaction rates were determined at lower temperatures. The importance of the urea/amine ratio and the temperature dependence of the reaction rates indicate that urea decomposition into an isocyanic acid or a carbamate intermediate is the rate-limiting step. The presence of water leads to a modest increase in reaction rates, but the full conversion of amino groups into ureido groups is also possible in the absence of water in neat alcohol, consistent with a reaction mechanism mediated by an isocyanic acid intermediate (where the water assists in the proton transfer). Hence, the reaction with urea avoids the use of toxic isocyanate reagents by in situ generation of the reactive isocyanate intermediate, but the requirement to separate the excess urea from the reaction product remains a major disadvantage.

scholarly journals Insecticidal activity of citronella grass essential oil on Frankliniella schultzei and Myzus persicae

2013 ◽  
Vol 37 (2) ◽  
pp. 138-144 ◽  
Author(s):  
Patrícia Fontes Pinheiro ◽  
Vagner Tebaldi de Queiroz ◽  
Vando Miossi Rondelli ◽  
Adilson Vidal Costa ◽  
Tiago de Paula Marcelino ◽  
...  
Keyword(s):  
Essential Oil ◽  
Insecticidal Activity ◽  
Myzus Persicae ◽  
Green Peach Aphid ◽  
Biological Activities ◽  
Chemical Constituents ◽  
Economic Losses ◽  
Frankliniella Schultzei ◽  
Wide Range ◽  
Citronella Grass

The thrips, Frankliniella schultzei, and green peach aphid, Myzus persicae, cause direct damage to plants of economic importance and transmit phytoviruses, causing large economic losses. Chemical constituents of essential oils present a wide range of biological activities. The aim of this work was to evaluate insecticidal activity of essential oil from citronella grass, Cymbopogon winterianus, on F. schultzei and M. persicae. This essential oil was obtained by steam distillation and components were identified by GC/FID and GC/MS. A Potter spray tower was used to spray insects with the essential oil. The major constituents are geraniol (28.62%), citronellal (23.62%) and citronellol (17.10%). Essential oil of C. winterianus at 1% (w v-1) causes mortality in F. schultzei and M. persicae at 34.3% and 96.9%, respectively. The LC50 value for M. persicae was 0.36% and LC90 0.66%. Thus, citronella grass essential oil at 1% (w v-1) is more toxic to M. persicae than F. schultzei. This essential oil shows promise for developing pesticides to manage M. persicae.

Development of nanoemulsion from Vitex negundo L. essential oil and their efficacy of antioxidant, antimicrobial and larvicidal activities (Aedes aegypti L.)

2017 ◽  
Vol 24 (17) ◽  
pp. 15125-15133 ◽  
Author(s):  
Sundararajan Balasubramani ◽  
Thamaraiselvi Rajendhiran ◽  
Anil Kumar Moola ◽  
Ranjitha Kumari Bollipo Diana
Keyword(s):  
Essential Oil ◽  
Aedes Aegypti ◽  
Vitex Negundo ◽  
Larvicidal Activities

scholarly journals Bis-NHC–Ag/Pd(OAc)2 Catalytic System Catalyzed Transfer Hydrogenation Reaction

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Hui-Ju Chen ◽  
Chien-Cheng Chiu ◽  
Tsui Wang ◽  
Dong-Sheng Lee ◽  
Ta-Jung Lu
Keyword(s):  
Functional Groups ◽  
Catalytic System ◽  
High Efficiency ◽  
Aqueous Media ◽  
Hydrogenation Reaction ◽  
Transfer Hydrogenation ◽  
Terminal Alkynes ◽  
Wide Range ◽  
Transfer Hydrogenation Reaction

The bis-NHC–Ag/Pd(OAc)2 catalytic system (NHC = N-heterocyclic carbene), a combination of bis-NHC–Ag complex and Pd(OAc)2, was found to be a smart catalyst in the Pd-catalyzed transfer hydrogenation of various functionalized arenes and internal/terminal alkynes. The catalytic system demonstrated high efficiency for the reduction of a wide range of various functional groups such as carbonyls, alkynes, olefins, and nitro groups in good to excellent yields and high chemoselectivity for the reduction of functional groups. In addition, the protocol was successfully exploited to stereoselectivity for the transformation of alkynes to alkenes in aqueous media under air. This methodology successfully provided an alternative useful protocol for reducing various functional groups and a simple operational protocol for transfer hydrogenation.

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