Acceptabilité des produits alimentaires enrichis avec les autolysats de viscères d’Esturgeon « Acipenser baeri ».

RANDRIAMIDOSY Jean Claude, RAVONINJATOVO Mboahangy, ANDRIAMBELOSON Onja, RANDRIAMAHATODY Zo, RAZANAMPARANY Julia Louisette

Food fortification with high-protein ingredients from untraditional sources is attracting increasing interest due to its implications for food safety. This study explores the use of autolysate obtained from sturgeon "Acipenser baeri" viscera as an enriching ingredient in two foodstuffs (cassava cake and croquette). Enzymatic autolysis of these viscera generated a protein-rich autolysate. Cassava cakes and croquettes were enriched with different proportions of autolysate, increasing their protein content by up to 17%. Microbiological analyses confirmed that the enriched products were hygienically satisfactory and fit for consumption. The best-before date is estimated at up to two months. Hedonic tests carried out with tasters revealed that the incorporation of autolysates into foodstuffs did not result in any significant difference in the appreciation of cassava cakes. However, fortified samples were distinguished from the control by significant differences in taste and texture, with tasters identifying fishy notes and a slight bitterness, which negatively affected their appreciation and purchase intention. For kibbles, ANOVA test results revealed no significant difference between the fortified samples, with the exception of the 20% autolysate sample, which was perceived as tasting different from the control. These observations were also found with cassava cakes, where the panels also noted the persistence of fishy taste and bitterness in the enriched samples.

Key-words: Autolysate, satisfactory, enrichment, acceptability

18/04/2024

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Variabilité de la densité du bois de Ravenala madagascariensis Sonn. Prédite par la spectroscopie proche infrarouge.

RAMANANANTOANDRO Tahiana, RASOAMANANA Lalaina Patricia, RAZAFIMAHATRATRA Andriambelo Radonirina

Near infrared spectroscopy (NIRS) is a promising non-destructive method for wood analysis. In this study, the effectiveness of SPIR in predicting the wood density (WSG) of Ravenala madagascariensis, an endemic non-woody species of Madagascar, was evaluated. To do this, radial samples were taken from 3 compartments (stipe, leaf sheath, leaf), from 120 trunks of Ravenala madagascariensis collected from 3 sites. Near infrared spectra were taken from the samples. The results show that the optimal prediction model combines a "SNV (standard normal variation) + DT (detrend)" pre-treatment and uses 11 latent variables. The parameters of this model are : RMSEcv of 0.013 g.cm-3, R²cv of 0.73 and RPDcv of 2.76. In independent validation, the model showed an R² of 0.70 and an RPD of 2.17, with 11 numbers of latent variables. Application of the predictive model revealed significant radial variability in WSG in Ravenala madagascariensis. The central zone has a lower density (mean of 0.082 g.cm-³) than the peripheral zone (0.12 g.cm-³), with a highly significant difference (threshold >0.1%). In addition, there was a significant interaction effect between the radial part and the compartment on WSG. No significant effect was observed for the radial part × site interaction. This study provides valuable information on the wood properties of this endemic species, improving our understanding of its ecological and physical importance.

Key-words: Near InfraRed Spectroscopy, prediction, WSG (wood specific gravity), radial variability, Ravinala

02/05/2024