Many essential oils, such as garlic, oregano, cinnamon, thyme, basil, eucalyptus,rosemary, peppermint, etc., have been demonstrated to show antimicrobial activity . Therefore, these natural products are an alternative to replace synthetic chemical pesticides .The biological activity of these oils can be lost by volatilization of active components or their degradation by act of high temperatures, oxidation and UV light0.These disadvantages make the commercial application of these oilslimited.Microen capsulation, as one of the most efficient methods for the protection of essential oils, has to be employed for controlling the release of active ingredients and protecting them from the external environment.Many researches are done on microencapsulation of essential oils using several methods including spray-drying, simple coacervation,complex coacervation,co-extrusion/gelling,supercritical fluid precipitation,etc. Co-extrusion/gelling is considered as one of the most common approaches of microencapsulation.
This process happens when a fluid flows in laminar state and breaks into droplets of a same size through an overlapped vibration. Then these drops transform into a gel in an ionic solution, resulting in the encapsulation of the activing redient with a polymer.There are several methods for applying microcapsules in agrotextiles, like padding, bath exhaustion, printing, coating, etc. In all of them, the microcapsule’s shell is not usually an agent that can react with the fibers, so it is necessary to make them adhere to the fiber by means of a resin, otherwise they will be lost .In the textile industry, the most common resins are: acrylics, polyurethanes,silicones, etc., all of them are synthetic, and for agriculture application are not suitable due to their low degradability. Biodegradable polymers, like chitosan,become an alternative to the use instead of chemicals .Chitosan is a natural biopolymer that is derived from chitin by chemical, electro chemicalor enzymatic methods . It has unique properties that make it very interesting for medical, agricultural and food applications.
It has high antimicrobial activity ; It is biocompatible ; nontoxic ; strengthens the plants and; it has functional properties as a dietary supplement amongothers.Besides, chitosan has the ability to form hydrogels, dimensional polymeric networks with high water absorption capacity , which is very interesting from agricultural point of view.In the last years, a growing interest on the use of biobased materials or materials from renewable resources has been detected. This interest has also arrived to technical sectors such as agriculture. Therefore, the use of natural and renewable materials for the control of erosion in the soil,the use of the molecules with biological activity to control the microorganisms and the use of natural biopolymer to functionalized agricultural systems open a wide range of possibilities from the point of view of sustainable agriculture.For that, the first task is the revalorization of hemp wastes in textile nonwoven industry using the wet laid technology to obtain an ECB. To provide high cohesion on nonwovens, different binder fibers have been used: Lyocell fibre and PLA fiber.
The second task is the microencapsulation oregano essential oil by co-extrusion/gelling method using alginate as shell material. The main chemical thermaland functional properties are determined by standardized test.The third task is the functionalization of hemp nonwoven with the microcapsules application on its surface. To provide high durability the microcapsules on the nonwoven a biopolymer have been used. The main properties such as air permeability, antimicrobial are determined by standardized test. Research has demonstrated that the inability to successfully monitor and inhibit inappropriate behaviours is apparent in substance abusers as well as in other individuals with altered frontal neural circuitry. Such disruption in executive functioning, which can also include selective attention and short term storage of information,initiation of response to relevant information and self monitoring of performance in order to achieve a desired goal , can cause severe disruption in daily life.
Of these elements, however, response inhibition is most vital since it allows for successful adaptation to the environment,recognizing unexpected situations, making plans and changing behaviour accordingly.Functional magnetic resonance imaging research has shown that response inhibition is mediated by a wide neural network that involves the frontal lobes as well as circuits connecting the frontal lobes with other regions such as the parietal lobes, cerebellum, striatum and thalamus . Other observed regions include the premotor area, the supplementary motor area,the dorsolateral and orbitofrontal areas and the anterior cingulate cortex .