Dietary protein regulates gastric emptying, which may further influence postprandial glycemic response and subsequent food intake. However, how different meat protein sources affect gastric emptying and the underlying mechanisms remain unclear. In this study, we compared the effects of meat proteins from chicken, duck, goose, pork, and mutton on gastric emptying rates, dextrin-induced glycemic response, and food intake in rats. Their digestive properties were further analyzed using a static in vitro digestion model to investigate the relationship between protein digestion characteristics and gastric emptying. In vivo results showed that duck and mutton proteins exhibited slower gastric emptying than other proteins, accompanied by attenuated postprandial glycemic response and reduced food intake. In vitro, these proteins exhibited lower gastric digestibility and peptide release, together with greater surface hydrophobicity, higher β-sheet content, and delayed protein degradation and particle size reduction during digestion. These findings suggest that the higher structural stability of meat proteins, as reflected in the retention of β-sheet content and higher surface hydrophobicity, may reduce susceptibility to enzymatic hydrolysis and slow chyme evolution, including particle size reduction and the formation of soluble digestion products, which may contribute to delayed gastric emptying. Our study sheds light on how protein structural properties influence gastric digestion and emptying, providing a basis for designing meat-based foods with specific digestive behaviors and metabolic responses.
Hongxia Liu, Feifan Zhang, Yang Zhai et al.· Food Research International· 0 citations
Animal protein sources may differentially influence glucose homeostasis, yet the underlying mechanisms remain unclear. We investigated how casein, pork, beef, mutton, chicken, duck, and goose proteins differentially affected glucose homeostasis in mice and their associations with gut microbiota and bile acids. Mice fed duck protein exhibited more favorable glucose tolerance and insulin sensitivity than those fed pork protein. These differences were accompanied by coordinated alterations in gut microbiota and bile acid profiles, including enrichment of Clostridium, increased abundance of the baiE gene, and elevated secondary bile acids. Compared with pork protein, duck protein intake increased ileal fibroblast growth factor 15 expression and portal active glucagon-like peptide-1 concentrations, upregulated adipose thermogenic and lipid oxidation genes, while downregulating hepatic gluconeogenic genes. Correlation analysis revealed associations between these genes and glucose metabolic parameters. Collectively, alterations in the microbiota–bile acid axis may contribute to the favorable glucose homeostasis observed in duck protein-fed mice.
Hongxia Liu, Haifeng Li, Yang Zhai et al.· Food Chemistry: X· 0 citations
This study established a multiscale analytical framework to systematically investigate the mass transfer behavior of NaCl and moisture in chicken breast during ultrasonic-assisted low-temperature braising, as well as the regulatory mechanisms impacting quality evolution. Kinetic analysis demonstrated that ultrasound treatment significantly enhanced NaCl migration during processing, with the NaCl content reaching 1.83 g/100 g after treatment at 600 W for 150 min, representing a 29.8% increase compared with the control. The effective diffusion coefficient (Deff) calculated using Fick's second law increased to (5.69-6.37) × 10-9 m2/s under ultrasonic treatments. Low-field magnetic resonance imaging (LF-MRI) combined with image binarization revealed that ultrasound promoted the penetration of NaCl toward the sample center and improved moisture distribution. The proportion of immobilized water (P21) reached 96.39% at 450 W for 30 min. At the microscopic level, haematoxylin-eosin (HE) staining, and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) analyses revealed that ultrasound treatment generated microchannels, reducing mass transfer resistance. The resulting spongy structure enhanced moisture retention capacity. COMSOL Multiphysics simulations visualized the spatial and temporal evolution of NaCl and moisture migration, with strong agreement between predicted and experimental values (R2 > 0.97). Moderate ultrasonic treatment (300-450 W) achieved a favorable balance between enhanced salt uptake and reduced moisture loss, resulting in improved texture properties, including decreased shear force and hardness. The study established a correlation framework of "ultrasound transfer-structure response-quality improvement", providing insights into the precise control and quality improvement of novel thermally processed meat products using ultrasound treatment.
Yanzhao Zheng, Jinxue Hou, Jiacheng Chen et al.· Food Research International· 0 citations
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