Olive fruits processing generates solid residues and liquid wastewaters, which represent a severe environmental issue, due to their chemical characteristics and to the huge volumes generated. The well recognized efficiency of yellow mealworm (Tenebrio molitor) to convert low quality organic matter into a biomass rich in high-quality protein and fat could constitute a valuable solution in the handling of solid olive wastes. The study aimed to evaluate how feeding could affect growth performance and nutritional composition of yellow mealworm larvae reared on substrates made up of wheat milling and olive processing by-products. Three olive pomace/middlings (low-grade wheat flour) mixtures (S2 = 25/75; S3 = 50/50; S4 = 75/25% w/w) were selected as insect feeding substrates; middlings (S1) was used as control diet. Incorporation of olive pomace reduced the crude protein content (from 50.1 to 38.0%) and increased the crude fibre amount (from 7.1 to 10.2%) and the total minerals (from 3.9 to 4.6%) of larvae, on dry matter basis. No significant differences in the fat content among larvae reared on control and pomace enriched feeding substrates were observed. The inclusion level of pomace did not affect the fatty acid composition of body lipids. The essential/non-essential amino acids ratio (0.71-0.79) was not significantly affected by substrate composition. While no inhibitory activities of trypsin were observed, anti-chymotrypsin activities were detected in all tested larvae, even if their levels do not pose any safety problems. Larval development of mealworm was strongly affected by the diets: larvae grown on control diet (S1) showed shorter development time, lower number of instars, higher survival rate, and higher last instar weight than olive pomace-based substrates (S2-S4). This study was financially supported by the Università Politecnica delle Marche, Ancona, Italy, within the project “Edible insects: new frontiers in food-FOODIN”.

Use of Tenebrio molitor (L.) larvae for bio-recovering of olive oil industry solid wastes / Mannozzi, C; Foligni, R; Raffaelli, N; Ruschioni, S; Loreto, N; Riolo, P; Zamporlini, F; Pasquini, M; Mozzon, M. - ELETTRONICO. - (2019). (Intervento presentato al convegno 33rd EFFoST International Conference 2019. Sustainable Food Systems - Performing by Connecting tenutosi a Rotterdam, The Netherlands nel 12-14 November).

Use of Tenebrio molitor (L.) larvae for bio-recovering of olive oil industry solid wastes

Mannozzi, C
;
Foligni, R;Raffaelli, N;Ruschioni, S;Loreto, N;Riolo, P;Zamporlini, F;Pasquini, M;Mozzon, M
2019-01-01

Abstract

Olive fruits processing generates solid residues and liquid wastewaters, which represent a severe environmental issue, due to their chemical characteristics and to the huge volumes generated. The well recognized efficiency of yellow mealworm (Tenebrio molitor) to convert low quality organic matter into a biomass rich in high-quality protein and fat could constitute a valuable solution in the handling of solid olive wastes. The study aimed to evaluate how feeding could affect growth performance and nutritional composition of yellow mealworm larvae reared on substrates made up of wheat milling and olive processing by-products. Three olive pomace/middlings (low-grade wheat flour) mixtures (S2 = 25/75; S3 = 50/50; S4 = 75/25% w/w) were selected as insect feeding substrates; middlings (S1) was used as control diet. Incorporation of olive pomace reduced the crude protein content (from 50.1 to 38.0%) and increased the crude fibre amount (from 7.1 to 10.2%) and the total minerals (from 3.9 to 4.6%) of larvae, on dry matter basis. No significant differences in the fat content among larvae reared on control and pomace enriched feeding substrates were observed. The inclusion level of pomace did not affect the fatty acid composition of body lipids. The essential/non-essential amino acids ratio (0.71-0.79) was not significantly affected by substrate composition. While no inhibitory activities of trypsin were observed, anti-chymotrypsin activities were detected in all tested larvae, even if their levels do not pose any safety problems. Larval development of mealworm was strongly affected by the diets: larvae grown on control diet (S1) showed shorter development time, lower number of instars, higher survival rate, and higher last instar weight than olive pomace-based substrates (S2-S4). This study was financially supported by the Università Politecnica delle Marche, Ancona, Italy, within the project “Edible insects: new frontiers in food-FOODIN”.
2019
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/282388
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