Towards establishing the spoilage mechanisms of the long-horned grasshopper Ruspolia differens Serville

Unlike other foods of animal origin, the spoilage mechanisms of edible insects remain unknown. This research intends to establish the cause of spoilage of the long-horned grasshopper, Ruspolia differens , with high and low water activity ( a w ). To achieve this, fresh and spoiled raw and processed...

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Bibliographic Details
Published in:European food research & technology 2021-12, Vol.247 (12), p.2915-2926
Main Authors: Ssepuuya, Geoffrey, Nakimbugwe, Dorothy, Van Campenhout, Leen, De Winne, Ann, Claes, Johan, Van Der Borght, Mik
Format: Article
Language:English
Subjects:
Agriculture
Aldehydes
Analytical Chemistry
Anisidine
Antioxidants
Biotechnology
Chemistry
Chemistry and Materials Science
Fatty acids
Food
Food Science
Forestry
Grasshoppers
Insects
Ketones
Microorganisms
Oleic acid
Organic acids
Original Paper
Oxidation
Proteins
Rancidity
Ruspolia differens
Spoilage
Sulfur compounds
Volatile compounds
Water activity
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Summary:Unlike other foods of animal origin, the spoilage mechanisms of edible insects remain unknown. This research intends to establish the cause of spoilage of the long-horned grasshopper, Ruspolia differens , with high and low water activity ( a w ). To achieve this, fresh and spoiled raw and processed grasshoppers stored under different conditions were assessed for (i) fat oxidation, (ii) antioxidant levels, and (iii) volatile compounds which served as indicators for different spoilage mechanisms. Results indicate that the free fatty acid value (6.69% as oleic acid), peroxide value (2.66 mEq O 2 /kg) and p -anisidine value (1.04) of fresh R. differens are similar to those of spoiled raw ( a w  = 0.98) and oven-roasted ( a w  = 0.95) R. differens . The headspace of the latter only possesses volatile sulphur compounds (dimethyl disulphide and dimethyl trisulphide), indicating microbial spoilage. Conversely , the headspace of spoiled R. differens with low a w (
ISSN:1438-2377
1438-2385
DOI:10.1007/s00217-021-03824-9