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  • Author or Editor: A. López-Malo x
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The effect of oral administration of spray-dried microcapsules of feruloyl esterase (FE) producing Lactobacillus fermentum CRL1446 (Lf) and Lactobacillus johnsonii CRL1231 (Lj) on high fat diet-induced obese mice was investigated to evaluate whether these strains could be used as a biotherapeutic for obesity. Swiss albino mice were divided into a normal diet fed group receiving empty microcapsules (control), a high fat diet plus empty microcapsules (HFD group), HFD plus microcapsules with Lf (HFD-Lf group) and HDF plus microcapsules with Lj (HFD-Lj group). Microcapsules containing Lf or Lj at a dose of ~107 cells/day/mouse were given orally for 7 weeks. Body weight gain, adiposity index, plasma leptin, lipid profiles, glycaemia, insulinemia, oral glucose tolerance, intestinal FE, glutathione peroxidase and glutathione reductase (GR) activities were determined. Administration of lactobacilli (HFD-Lf and HFD-Lj groups) improved metabolic parameters (triglyceride, total cholesterol, low-density lipoprotein cholesterol levels) and cardiovascular risk indicators (37-46% decrease of atherogenic index), and reduced body weight gain (29-38%), adiposity index (42-62%), plasma leptin levels, liver weight and fat deposition in liver. Intestinal FE activities significantly increased in HFD-Lf (62%) and HFD-Lj group (48%), thus improving hepatic GR activity (42% increment) compared to HFD group. Moreover, L. johnsonii increased HDL-cholesterol and L. fermentum reduced blood glucose to levels similar to the control. These FE-producing lactobacilli have the potential to improve biomarkers involved in obesity by increasing intestinal FE activity.

In: Beneficial Microbes

Abstract

This study explores using insects as a high-quality protein source rich in bioactive peptides for human nutrition. The objectives include establishing optimal conditions for peptide extraction, identifying their sequences, and assessing their potential as antioxidants and antimicrobial agents in Arsenura armida flour. The protein content in the A. armida flour extract was 54%. To obtain potential antioxidant and antimicrobial peptides, a 10:1 and 1:1 enzyme (pepsin)/substrate ratio was employed, with digestion times of 2 h (A2) and 1 h (A4), respectively. The IC50 value for the antioxidant assay DPPH (2,2-Difenil-1-Picrilhidrazilo) was 22.5 μg/μL for A2. In the antioxidant in vivo assay with Caenorhabditis elegans, A2 peptides at concentrations of 0.75 μg/μL and 1.5 μg/μL exhibited a survival percentage ranging from 32.6% to 35.3%. The A4 sample demonstrated the highest antimicrobial activity, inhibiting the growth of Gram-positive bacteria (Listeria monocytogenes and Staphylococcus aureus) with MIC (minimum inhibitory concentration) values of 0.11 μg/mL and 0.23 μg/mL and MBC (minimum bactericidal concentration) of 0.23 μg/mL for both. Peptide analysis revealed that A2 contained peptides with identified antihypertensive (37%) and antioxidant (58%) activities, while A4 comprised peptides with antihypertensive (62%), antioxidant (31%), and antimicrobial (2%) properties. The antimicrobial peptides identified through the BIOPEP database were LFGF and FLLF. This investigation underscores the potential of A. armida peptides as valuable components in functional foods or nutraceuticals, offering health benefits beyond basic nutrition.

In: Journal of Insects as Food and Feed