Please use this identifier to cite or link to this item: http://hdl.handle.net/11189/9249
Title: The nutritional quality and structural analysis of black soldier fly larvae flour before and after defatting
Authors: Zozo, Bongisiwe 
Wicht, Merrill Margaret 
Mshayisa, Vusi Vincent 
Van Wyk, Jessy 
Keywords: Black soldier fly;insect;proximate;defatting;structural analysis;insect flour
Issue Date: 2022
Publisher: MDPI
Source: Zozo, B., Wicht, M. M., Mshayisa, V. V. et al. 2022. The nutritional quality and structural analysis of black soldier fly larvae flour before and after defatting. Insects, 13: 168. [https://doi.org/ 10.3390/insects13020168]
Journal: Insects 
Abstract: This study aimed to assess the nutritional information and structural overview of the BSFL (black soldier fly larva) flours (full fat and defatted). The BSFL flours were obtained by freeze-drying the larvae and the removal of fat using hexane and isopropanol ratio of 3:2 (v/v), these solvents were used due to their defatting efficiency and because they are less toxic. Nutritional and structural analyses were conducted using standard methods. The full-fat and defatted flours had high protein content (45.82% and 56.11% respectively). Defatting significantly (p < 0.05) increases the protein content by approximately 10%, while the fat content decreased from 25.78% in full-fat larvae to 4.8% in defatted larvae. The compositional data were qualitatively confirmed with Universal Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (UATR-FTIR) mainly in the amide I and II regions. Thermal gravimetry (TG) and differential scanning calorimeter (DSC) analysis, showed the conformational physical changes induced due to removal of fat which affected protein denaturation. DSC analysis displayed curves of both endothermic and exothermic reactions. During the first heating program, both samples had wide endothermic heating peaks ranging from 42 to 112 ◦C, which may be attributed to the water content in the samples evaporating. The first stage of the decomposition process was important, with loss of free and loosely bound water up to 150 ◦C, according to TGA curves. Protein and carbohydrates volatilized during the second stage of decomposition. The third level may be linked to polypeptide decomposition. FTIR revealed that the defatting process induced structural modifications on the amide I (1650 cm−1 ) and amide II (1540 cm−1 ) regions. Defatting has a significant effect on the functional groups and nutritional value of the BSFL. Defatted as well as fullfat flour both show good nutritional and structural characteristics for use in many food applications, however the improved proximate composition of the defatted BSFL can be applied to food products using BSFL flour as an alternative ingredient.
Description: Article
URI: http://hdl.handle.net/11189/9249
ISSN: 2075-4450
DOI: https://doi.org/ 10.3390/insects13020168
Appears in Collections:Appsc - Journal Articles (DHET subsidised)

Files in This Item:
File Description SizeFormat 
The_nutritional_quality.pdfArticle840.54 kBAdobe PDFView/Open
Show full item record

Google ScholarTM

Check

Altmetric


Items in Digital Knowledge are protected by copyright, with all rights reserved, unless otherwise indicated.