Potential Synergistic Action of Liquid Olive Fruit Polyphenol Extract with Aqueous Extracts of Solid Wastes of Pomegranate or/and Orange Juice Industry as Organic Phyto-protective Agents against Important Plant Pathogens - Part 1 (in vitro Studies)

Antimicrobial Properties of Lyophilized Extracts of Olive Fruit, Pomegranate and Orange Peel Extracts against Foodborne Pathogenic and Spoilage Bacteria and Fungi In Vitro and in Food Matrices

“…For this reason, in the last decades the food industry has been seeking ways to utilize agricultural waste in order to tackle waste management and also produce novel products of added value. Notably, the utilized food byproducts, especially fruit and vegetable by-products, often consist of valuable components [2] such as phenols, flavonoids, pigments, and organic acids, which can be used in food and feed as natural antioxidants and/or antimicrobials [3][4][5], or in phytoprotection [5][6][7] and in cosmetics and pharmaceuticals [8], potentially replacing synthetic chemical preservatives. Our research has focused on the utilization of olive mill waste, orange peel, and pomegranate peel waste and their potential application as natural antimicrobial substances in vitro against important food pathogens and spoilage microorganisms and in the formulation of natural substances that can replace chemical additives in food matrices, in accordance with consumers' demand for "green label" foods.…”

“…Orange fruit pulp and peels represent a large amount of the total worldwide production of >73 million tons of orange fruits [5] and their disposal is problematic especially in the orange juice industry. Interestingly, these byproducts of juice production are rich in phenols, flavonoids, flavone glycosides, organic acids, as well essential oils, which are reported to exert antimicrobial activity against several bacterial pathogens [13][14][15].…”

Corn Silage Supplemented with Pomegranate (Punica granatum) and Avocado (Persea americana) Pulp and Seed Wastes for Improvement of Meat Characteristics in Poultry Production

“…Several by-products of agricultural processing (e.g., fruit pulps and fruit residues resulting from juicing procedure) appear increased management costs and/or can pollute the environment when disposed-off without any treatment. However, these by-products often hide a small “treasure”, i.e., natural antioxidants-antimicrobials-bioactive substances [ 87 , 88 , 89 ] that can be isolated and utilized from the waste, providing high added value in a product and affecting health and productivity of farm animals but also designate the cost of livestock products. The aforementioned approach is also an EU guideline on bio-refinery.…”

Effectiveness of Olive Fruit Polyphenol Extract Combined with Aqueous Extracts of Solid Wastes of Pomegranate or/ and Orange Juice Against Important Plant Pathogens - Part 2 (in vivo studies)

“…The plant pathogens, their code and the source of collection are listed in the following Table 1. The potential antimicrobial activity of liquid olive fruit polyphenol extract with aqueous extracts of solid wastes of pomegranate or/and orange juice industry against fungal phytopathogenic species were examined in previous in vitro research study where results showed that the use of olive fruit and pomegranate polyphenol extract affected the mycelium growth of B. cinerea, V. dahliae, R. solani and P. lycopersici [50]. The concentrations and combinations of liquid olive fruit pomegranate and orange extracts used were as follows in Table 2.…”

“…The possible phytotoxic effects of these extracts were also evaluated. The method followed was described in previous work completed by Leontopoulos et al, [50][51][52]. More specific the tomato plants were transplanted in disposable plastic pots (19 x 18 cm) which were filled with a mixture of high peat Potgrad P, suitable for propagation of horticultural seedling obtained from Company Klassman-Dolmann GmbH Germany as imported in Greek market from AGROCHOUM SA with pH: 5,5-6,5; EC: 45mS/m and organic matter: 90-95%.…”