olive leaf

Tomatillo (Physalis philadelphica L.) is an annual plant native to Mexico and Guatemala, and cultivated in other tropical and subtropical regions. In October 2023, tomatillo plants with interveinal yellowing of leaves, marginal chlorosis, leaf thickening, and leaf rolling symptoms (Figure 1) were observed at Colquitt and Tift County, Georgia, US. The disease incidence ranged from 80-100 % which reduced fruit quality and marketability. Twenty tomatillo leaves exhibiting severe symptoms were collected, and, sub-sampled of the leaves were pooled into microcentrifuge tubes...

Olive leaves are an abundant by-product of olive oil production. Olive leaf extracts (OLEs) are rich in polyphenols, which can be used for health benefits. As polyphenols are the main antioxidant molecules in plants, plants typically increase their polyphenol content when exposed to drought stress. However, the phenolic profile of OLEs can vary in relation to the origin and variety of the plant material. In this work, olive leaf extracts from three different Italian olive cultivars (Giarraffa, Leccino, and Maurino) both exposed and not exposed to drought stress were studied in terms of antioxidant properties and profile, intestinal permeation, and protection against oxidative stress of human umbilical vein endothelial cells (HUVECs), since HUVECs are considered a model to study a wide range of diseases...

The food products derived from Olea europaea are a fundamental part of the Mediterranean diet, and their health-promoting effects are well known. In this study, we analyzed the phytochemical characteristics, the redox state modulatory activity, and the cytotoxic effect of an olive leaf aqueous extract enriched by macroporous resin on different tumor and normal cell lines (LNCaP, PC3, HFF-1). HPLC-DAD analysis, the Folin-Ciocalteu and aluminum chloride methods confirmed the qualitatively and quantitatively high content of phenolic compounds (130...

The utilisation of insect meal-based fish feed as a substitute for conventional fish meal-based fish feed is considered as a promising innovative alternative to boost circularity in aquaculture and aquaponics. Basic research on its use in aquaponics is limited. So far, no reports on the effects of fish waste water, derived from a recirculating aquaculture system using Black Soldier Fly (BSF) meal-based diets, were available on the growth performance of lettuce. Therefore, this study aimed to compare the effect of reusing fish waste water from tilapia culture (as a base for the nutrient solution) fed with a fish meal-based diet (FM) and a BSF meal-based diet on resource use and lettuce growth in decoupled aquaponic systems...

Ulmus parvifolia Jacq. is an important tree with ornamental value, which is widely planted in Hebei and southern regions of China. In September 2022, a leaf spot symptom was observed on about approximately 20% U. parvifolia seedlings growing a tree farm (20000 m2) of Jiangsu Academy of Forestry (118°45'57.30″E, 31°51'27. 94″N). Gray to black spots appeared on leaves of seedlings. Five diseased leaves were collected from five different seedlings. The pieces were excised from the margins between healthy and diseased tissues, surface sterilized in 75% ethanol for 30 s and then in 1...

The current study proposes an efficient coating methodology for the development of low-density polyethylene (LDPE) films with prolonged bioactivity for food packaging applications. Three natural phenolic-based substances were incorporated at optimized concentrations in methyl-cellulose-based solutions and used as coatings on LDPE films. The amount of surfactant/emulsifier was optimized to control the entrapment of the bioactive substances, minimizing the loss of the substances during processing, and offering prolonged bioactivity...

The large generation of olive by-products has motivated their revalorization into high-added-value products. In this regard, olive leaves pose as an interesting source of bioactive compounds, due to their phenolic content with commonly known antioxidant, anti-inflammatory, and immunomodulatory properties, with potential application in non-communicable diseases. However, their effectiveness and applicability into functional foods is limited by their instability under gastrointestinal conditions. Thus, the development of protective formulations is essential...

Bottle gourd [Lagenaria siceraria (Mol.) Stand] is a widely cultivated succulent crop species. In December 2022, a serious bottle gourd disease occurred in the protected vegetable planting base of Xingguo County, Ganzhou City, Jiangxi Province, China, with 85% of the 2,100 plants having gray mold disease-like symptoms, including gray spots on the infected fruit. They quickly expanded at suitable temperature and humidity, forming a gray mold layer with inward depressions, which spread to the fruit stem causing watery rot, and the flesh turned black and started to rot...

In August 2021, severe leaf blight symptoms were observed on onion ( Allium cepa L. cvs Francia and Askari F1 hybrid) in commercial fields located in Mauritius, namely La Forêt (20°19'56.1"S57°30'04.9"E), St Aubin (20°29'47.0"S57°32'29.4"E) and Chapiron (20°20'46.8"S 57°29'12.8"E). Infected leaves displayed small circular to oblong yellow-pale-brown and spindle shaped lesions which later coalesced and formed necrotic areas with black sporulation. Three fields were selected from each region, and along a W-pattern across the fields a disease incidence ranging 53-93% and a severity of 9-28% were recorded...

Cucumis melo L. is an important fruit with widespread consumption and commercial value. However, an undescribed disease affecting Hami melon (Cucumis melo L. var. Luhoutian) plants has consistently emerged in the Qihe region of Dezhou, Shandong Province of China since 2021. The disease can occur in both seedling and mature stages of Hami melon plants, and in severely diseased areas, the incidence rate was seen as 40 to 80%. During the seedling stage, the initial symptom is the appearance of water-soaked spots on the leaves...

Background: Neuroprotective role of olive and its natural products can introduce them as alternative candidates for the management of neurodegenerative diseases including stroke. The present study was designed to evaluate whether pretreatment of olive oil and leaf extract can attenuate the most important destructive processes in cerebral ischemia called excitotoxicity. Material and Methods: The male rats were categorized into control, virgin olive oil (OVV), MCAO, MCAO + OVV (with doses of 0.25, 0...

Olive leaves as a main byproduct of olive oil and fruit industry are a valuable source of phytochemicals such as polyphenols, with multiple biomedical effects. Apart from leaves, olive branches and stems make up a significant amount of olive waste. It is well known that the drying process and long-term storage affect the stability and concentration of polyphenols present in raw materials. For that matter, two different means of storing olive waste, at room temperature and +4 °C, were compared by determining the content of the polyphenol oleuropein (OLE) in olive leaf, branch, and stem extracts (LE, BE, and SE) by HPLC-DAD method...

The use of a two-phase decanter (TwPD) for olive-oil extraction produces wastes and byproducts (a small volume of water from oil washing, olive leaves from the defoliator, and a high moisture pomace which can be destoned) that contain valuable bioactive compounds, such as phenolics and/or triterpenic acids. So far, there is no (water) or limited information (leaves and the destoned pomace fraction) on their content of bioactives, especially triterpenic acids. To contribute to the characterization of such streams from cultivars of international interest, in the present study, samples obtained from five mills from the region of Laconia (from one or two harvests) in Greece, where Koroneiki cv dominates, were screened for phenols and/or triterpenic acids...

Verticillium wilt of olive (VWO) is one of the most widespread and devastating olive diseases in the world. Harnessing host resistance to the causative agent is considered one of the most important measures within an integrated control strategy of the disease. Aiming to understand the mechanisms underlying olive resistance to VWO, the metabolic profiles of olive leaves, stems and roots from 10 different cultivars with varying levels of susceptibility to this disease were investigated by liquid chromatography coupled to mass spectrometry (LC-MS)...

In the present study, polymeric micelles were developed to improve the intestinal permeability of an extract of Olea europaea L. leaf with a high content of total polyphenols (49% w / w ), with 41% w / w corresponding to the oleuropein amount. A pre-formulation study was conducted to obtain a stable formulation with a high loading capacity for extract. The freeze-drying process was considered to improve the stability of the formulation during storage. Micelles were characterized in terms of physical and chemical properties, encapsulation efficiency, stability, and in vitro release...

Nanotechnology applications have been employed to improve the stability of bioactive components and drug delivery. Natural-based extracts, especially olive leaf extracts, have been associated with the green economy not only as recycled agri-waste but also in the prevention and treatment of various non-communicable diseases (NCDs). The aim of this work was to provide a comparison between the characteristics, biological activity, and gene expression of water extract of olive leaves (OLE), green synthesized OLE silver nanoparticles (OL/Ag-NPs), and OLE whey protein capsules (OL/WPNs) of the two olive varieties, Tofahy and Shemlali...

Rhinacanthus nasutus (L.) Kurz is a traditional Chinese medicine in China. In August 2022, leaf spots were observed on R. nasutus in a Chinese herbal garden in Zhanjiang, Guangdong Province, China (21°17'30″N, 110°18'25″E). Disease incidence was 90% (n = 100 investigated plants from about 800 plants). The yellow spots were round, gray in the center and scattered on the leaves. The coalescence of the individual spot eventually led to leaf wilt. Ten symptomatic leaves from 10 plants were sampled...

The main objective of this research was to understand the effect of different solvents (ethanol, ethyl acetate, and hexane) on the extraction of bioactive compounds in addition to the antioxidant activity of eight Tunisian and Algerian olive leaf ( Olea europaea L) cultivars. The different extracts were evaluated for their content of total phenols, flavonoids, and condensed tannins. The antioxidant capacity was determined by ABTS (2,2-azinobis (3 ethylbenzothiazoline-6-sulfonic acid) and DPPH (2,2-diphenyl-1 picrylhydrazyl) methods...

Camellia oleifera Abel, a woody oil plant, that is endemic to China. Tea oil, also referred to as "oriental olive oil," is a superior quality plant-based cooking oil. The production of tea oil accounts for 8% of the total edible vegetable oil production in the country. Since 2022, the annual output value of C. oleifera industry has exceeded 100 billion yuan, making it one of the major economic contributors to China's rural revitalization development strategy. In recent years, demand and production have grown in parallel...

COVID-19 is a highly infectious disease caused by a new type of extremely contagious coronavirus called SARS-CoV-2. The virus's main protease enzyme, SARS-CoV-2 Mpro, is essential for its replication and transcription processes. Targeting this enzyme presents a promising avenue for antiviral drug development. Researchers have explored the intricate three-dimensional configurations of the enzyme, analyzing its interactions with various inhibitors. These findings provide a foundation for designing specific and powerful inhibitors targeting SARS-CoV-2 Mpro...