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Novel soybean-based high protein bar rich in isoflavones improves insulin sensitivity in diabetic Wistar rats

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Abstract

This study assessed the effect of whey protein substitution with isolated soy protein in protein bar (PB) formulations at 25% (PB2), 50% (PB3), or 75% (PB1) weight/weight on the proximate and mineral composition, sensory, and antidiabetic properties. Sensory evaluation was conducted within diabetic (DB) and non-diabetic (NDB) consumers by preference ranking and acceptance test. The formulations were analysed in terms of moisture, ash, protein, lipid, carbohydrates, fibers and mineral content. The consumers did not distinguish the formulations by preference ranking test. However, the acceptability test showed a rating of 9 most frequent for PB1 (36.30%), followed by PB2 and PB3 (both 34.09%), among DB consumers. The PB1 and PB3 showed higher content of total, soluble and insoluble fibers and, PB 2 presented higher carbohydrate content. Potassium, sodium and calcium showed the highest mineral content in the formulations. PB3 was assessed for glycaemic and lipidemic control in diabetics and non-diabetics female Wistar rats, for this 20% of PB was added in the ration consumed ad libitum, besides, the rats received 100 mg/kg b. w. by gavage daily. The treatment did not reduce significantly fasting glucose, lipid profile, or peripheral glucose disposal in DB or NDB rats. However, it significantly improved insulin tolerance test values in diabetic rats. The results suggest that the formulations showed good acceptance and potentially ameliorate insulin resistance both in control group and in animal model of type II diabetes.

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Abbreviations

ANOVA:

Analysis of variance

ANVISA:

Brazilian Health Surveillance Agency

AUC:

Area under the curve

C:

Control group

Ca:

Calcium

CC:

Concordance coefficient

CTR:

Control group with a modified ration

CTRI:

Control group with a modified ration + isoflavones

D/V:

Daily value

DB:

Diabetic individuals

DC:

Diabetic control group

DL:

Detection limit

DM:

Diabetes mellitus

DRI:

Daily recommended intake

DTR:

Diabetic group with a modified ration

DTRI:

Diabetic group with a modified ration + isoflavones

Fe:

Iron

GLUT4:

Glucose transporter

HDL:

High-density lipoprotein

IRβ:

Insulin receptor β

ISP:

Isolated soy protein

ITT:

Insulin tolerance test

K:

Potassium

LDL:

Low-density lipoprotein

Mg:

Magnesium

Mn:

Manganese

Na:

Sodium

NDB:

Non-diabetic individuals

OGTT:

Oral glucose tolerance test

PB:

Protein bar

QL:

Quantitation limit

R2 :

Linear determination coefficient

STZ:

Streptozotocin

TC:

Total cholesterol

TG:

Triacylglycerol

VLDL:

Very low-density lipoprotein

WPC:

Whey protein concentrate

Zn:

Zinc

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Acknowledgements

We thank the National Council for Scientific and Technological Development (CNPq) and the Research Support Foundation of Mato Grosso (FAPEMAT) for financial support. We also thank the Federal Institute of Mato Grosso, Bela Vista Campus, and the Laboratory of Instrumental Analysis at the Federal University of Mato Grosso and University Centre of Várzea Grande for providing the infrastructure required to conduct this study.

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Correspondence to Wanessa Costa Silva Faria.

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Faria, W.C.S., Giordani, M.A., da Silva Arcas, A. et al. Novel soybean-based high protein bar rich in isoflavones improves insulin sensitivity in diabetic Wistar rats. J Food Sci Technol 55, 21–32 (2018). https://doi.org/10.1007/s13197-017-2753-y

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