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The use of entomopathogenic nematodes (EPNs) offers the potential of reducing the use of chemical insecticides in the agricultural industry. Hydrogels for the long-term storage of EPNs may have the potential to improve the storage ability of EPNs. In this study, infective juveniles (IJ) of a South African isolate Steinernema yirgalemense were formulated in different gels, which included a laboratory grade and consumer grade of agar, as well as STOCKOSORB® 660, and compared it with IJ in water. Their survival and pathogenicity of the IJ were investigated at 25 °C. The last instar larvae of Tenebrio molitor were used to test the pathogenicity of the IJs 6 weeks postformulation. IJs stored in 1% and 1.5% agar formulations were found to provide the best survival of 77% and 82% after 6 weeks in formulation. Results indicate consumer grade agar to be comparable with laboratory grade and can be used as a cheaper alternative for the formulation of S. yirgalemense. When comparing the STOCKOSORB® 660 formulations, 80% IJ survival was recorded in a formulation of 1 g in 50 ml of water, with 50% of the IJs surviving in a formulation of 1 g in 100 ml of water. The IJs formulated and stored in STOCKOSORB® 660 gel were found to be more virulent to Tenebrio molitor than were the IJs formulated in agar.
The use of entomopathogenic nematodes (EPNs) offers the potential of reducing the use of chemical insecticides in the agricultural industry. Hydrogels for the long-term storage of EPNs may have the potential to improve the storage ability of EPNs. In this study, infective juveniles (IJ) of a South African isolate Steinernema yirgalemense were formulated in different gels, which included a laboratory grade and consumer grade of agar, as well as STOCKOSORB® 660, and compared it with IJ in water. Their survival and pathogenicity of the IJ were investigated at 25 °C. The last instar larvae of Tenebrio molitor were used to test the pathogenicity of the IJs 6 weeks postformulation. IJs stored in 1% and 1.5% agar formulations were found to provide the best survival of 77% and 82% after 6 weeks in formulation. Results indicate consumer grade agar to be comparable with laboratory grade and can be used as a cheaper alternative for the formulation of S. yirgalemense. When comparing the STOCKOSORB® 660 formulations, 80% IJ survival was recorded in a formulation of 1 g in 50 ml of water, with 50% of the IJs surviving in a formulation of 1 g in 100 ml of water. The IJs formulated and stored in STOCKOSORB® 660 gel were found to be more virulent to Tenebrio molitor than were the IJs formulated in agar.
Abstract. The spread of ophthalmic infectious diseases around the world and uniformity of the market of dosage forms for their therapy generate an incentive for scientists to develop innovative drug forms, to create improved therapy for such diseases as uevitis, conjunctivitis, keratitis and blepharitis. There are two types of eye dosage forms on the market of the Russian Federation - drops and ointments, which have a short shelf life after the first application, a high risk of microbial infection and infection of a "healthy" eye. Based on these facts, the study aims to develop a solid extended dosed biodegradable ocular insert for use in ophthalmotherapy. This article is devoted to the peculiarities of influence of film forming agents of different nature, plasticizer and solubilizing agent (poloxamer) and their ratio on the biopharmaceutical properties of the polymeric base of ocular insert. Polymers of both natural and semi-synthetic nature (hydroxyethylcellulose, sodium alginate, xanthan and gellan gum) were used to create the polymeric basis. Placebo inserts were formed at room temperature in open space for three days. The test of the samples was carried out according to the parameters of description, elasticity, dissolution time, humidity, which include in the State Pharmacopeia XIV, and mucohedhesion, that is an important parameter for locally administering on mucosa, although it is not regulated in official documents. The series of experiments showed the optimum concentrations and ratios of the auxiliary substances used, namely 0.5% to 2.5% for film type manufacturers, 2% for plasticizers and 0.5% for poloxamers, respectively. The formulations that showed the best performance when evaluating the parameters were - sodium alginate 2.5%, glycerin 2%, poloxamer 0.5%, water purified up to 40.0; xanthan gum 0.4%, glycerin 2%, poloxamer 0.5%, water purified up to 40.0.have a wide variation in different age categories, which requires further study. on additional samples of children in the region.
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