Characterization of Nanospheres Containing Zanthoxylum riedelianum Fruit Essential Oil and Their Insecticidal and Deterrent Activities against Bemisia tabaci (Hemiptera: Aleyrodidae)

Abstract

The aim of our study was to produce and characterize poly-ε-caprolactone (PCL) nanospheres containing essential oils from Zanthoxylum riedelianum fruit and to evaluate their stability gains as well as their insecticidal and deterrent activities against whitefly (Bemisia tabaci). The PCL nanospheres exhibited a homogeneous spherical morphology, with particle diameters between 106.7 nm and 129.2 nm, pH of approximately 6, zeta potential (ZP) lower than −19.0 mV and encapsulation efficiency higher than 98%. Only 43% of the nanoencapsulated essential oil (NSEO) was degraded in response to ultraviolet light, whereas the essential oil (EO) degraded by 76% over the same period. In a free-choice test, the NSEO and EO reduced the number of whitefly eggs by approximately 70%. NSEO and EO at 1.5% killed 82.87% and 91.23% of 2nd-instar nymphs of whitefly, respectively. Although NSEO displayed lower insecticidal activity, it offers a greater advantage over the free EO, due to protection conferred by polymer against photodegradation. Therefore, its usage may optimize the maintenance of essential oils in the field through photoprotection and controlled release. Our results suggest that the EO of Z. riedelianum fruit can be used for B. tabaci management strategy; nevertheless, the benefits of NSEO require further evaluation at the field level.

<p>Novel Drug Delivery Systems for Loading of Natural Plant Extracts and Their Biomedical Applications</p>

“…146 More examples of herbal loaded NE are presented in Table 1. 142,143,[147][148][149] Nanocrystals They are pure drug crystals with nanosized particles (Figure 9) in which toxic side effects resulting from the encapsulating/solubilizing excipients may be eliminated. 150 The best known features of nanocrystals are high drug-loading capacity and platform stability that render them to be widely used to deliver poorly hydrophilic materials in the form of a colloidal dispersion.…”

Encapsulation of Essential Oils - A Booster to Enhance their Bio-efficacy as Botanical Preservatives

“…Polymers like poly (lactide) (PLA), poly-ε caprolactone (PCL) and poly lactide-co-glycolide (PLGA) are the most commonly used substances for nanoprecipitation (Rosset et al, 2012). Nanoencapsulation of Zanthoxylum riedelianum EO through nanoprecipitation caused improvement in the insecticidal activity against whitefly (Bemisia tabaci) and reduction in its photo-degradation up to 33% (Pereira et al, 2018). Besides, being the fast and economic technique, it is best suited for encapsulating hydrophobic substance (EOs) in comparison to hydrophilic core material (Ladj-Minost, 2012).…”

Compostos químicos isolados de extratos e óleos essenciais do gênero Zanthoxylum Linnaeus (Rutaceae) e seu potencial antimicrobiano

“…A análise do óleo essencial obtido a partir dos frutos e estudos fotoquímicos dos extratos da cascado caule e folhas de Z. riedelianum exibiram a presença de lupeol (4), sesamina (6), limoneno (12), espatulenol 14, β-cariofileno (16), β-cubebeno (20), δ-elemeno (21), α-copaene (24), α-tujeno (33), sabineno (34), α-pineno (35), β-mirceno (36), β -ocimeno (37), α-felandreno (38), β -elemeno (42), germacreno -D (53), biciclogermacreno (56), δ-cadineno (57), germacreno -A (66), α-cubebeno (108), β-pineno (111), aromadendreno (113), α-terpinolene (116), γ-muroleno (120), germacreno -B (180), metilpluviatolido (337), cariofilina (339), β-linalol (340), γ-elemeno (341), 6-acetonildiidroavicina (342), dimetilmatiresinol (343), hinocinina (344), 6-acetonil-N-metil-diidrodecarina (345), 6-acetonildiidroqueleritrina (346) e piperito-4´-O-γ,γdimethylallyl ether (347) (figura 1) (Lima et al 2007, Fernandes et al 2009, Costa et al 2017a, Pereira et al 2018.…”