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Crosslinking with transglutaminase does not change metabolic effects of sodium caseinate in model beverage in healthy young individuals.

Juvonen KR, Lille ME, Laaksonen DE, Mykkänen HM, Niskanen LK, Herzig KH, Poutanen KS, Karhunen LJ - Nutr J (2012)

Bottom Line: Studies on the postprandial effects of enzymatic crosslinking of milk proteins are sparse.Appetite ratings or subsequent energy intake did not differ among the protein beverages.Our results indicate that the metabolic responses of enzymatically crosslinked and native sodium caseinate in a liquid matrix are comparable, suggesting similar digestion and absorption rates and first pass metabolism despite the structural modification of Cas-TG.

View Article: PubMed Central - HTML - PubMed

Affiliation: Food and Health Research Centre, Department of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland. kristiina.juvonen@uef.fi

ABSTRACT

Background: Postprandial metabolic and appetitive responses of proteins are dependent on protein source and processing technique prior to ingestion. Studies on the postprandial effects of enzymatic crosslinking of milk proteins are sparse. Our aim was to study the effect of transglutaminase (TG)-induced crosslinking of sodium caseinate on postprandial metabolic and appetite responses. Whey protein was included as reference protein.

Methods: Thirteen healthy individuals (23.3 ± 1.1 y, BMI 21.7 ± 0.4 kg/m2) participated in a single-blind crossover design experiment in which the subjects consumed three different isovolumic (500 g) pourable beverages containing either sodium caseinate (Cas, 29 g), TG-treated sodium caseinate (Cas-TG, 29 g) or whey protein (Wh, 30 g) in a randomized order. Blood samples were collected at baseline and for 4 h postprandially for the determination of plasma glucose, insulin and amino acid (AA) concentrations. Gastric emptying (GE) was measured using the 13 C-breath test method. Appetite was assessed using visual analogue scales.

Results: All examined postprandial responses were comparable with Cas and Cas-TG. The protein type used in the beverages was reflected as differences in plasma AA concentrations between Wh and Cas, but there were no differences in plasma glucose or insulin responses. A tendency for faster GE rate after Wh was detected. Appetite ratings or subsequent energy intake did not differ among the protein beverages.

Conclusions: Our results indicate that the metabolic responses of enzymatically crosslinked and native sodium caseinate in a liquid matrix are comparable, suggesting similar digestion and absorption rates and first pass metabolism despite the structural modification of Cas-TG.

Show MeSH
Changes in the concentration of plasma glutamic acid (A), lysine/tyrosine (B), isoleucine (C), leucine (D), tryptophan (E), histidine (F), valine (G), phenylalanine (H) and proline (I) during the 240 min postprandial period in young individuals consuming beverages composed of caseinate (−−○−−), transglutaminase-treated caseinate (−●–) or whey protein (··▽··). Values are means ± SEM, n = 10, a) whey protein different from Cas-TG (P<0.05), b) whey protein different from Cas (P<0.05).
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Figure 3: Changes in the concentration of plasma glutamic acid (A), lysine/tyrosine (B), isoleucine (C), leucine (D), tryptophan (E), histidine (F), valine (G), phenylalanine (H) and proline (I) during the 240 min postprandial period in young individuals consuming beverages composed of caseinate (−−○−−), transglutaminase-treated caseinate (−●–) or whey protein (··▽··). Values are means ± SEM, n = 10, a) whey protein different from Cas-TG (P<0.05), b) whey protein different from Cas (P<0.05).

Mentions: Plasma amino acid profiles with significant differences among the test products are shown in Figures 3 and 4.


Crosslinking with transglutaminase does not change metabolic effects of sodium caseinate in model beverage in healthy young individuals.

Juvonen KR, Lille ME, Laaksonen DE, Mykkänen HM, Niskanen LK, Herzig KH, Poutanen KS, Karhunen LJ - Nutr J (2012)

Changes in the concentration of plasma glutamic acid (A), lysine/tyrosine (B), isoleucine (C), leucine (D), tryptophan (E), histidine (F), valine (G), phenylalanine (H) and proline (I) during the 240 min postprandial period in young individuals consuming beverages composed of caseinate (−−○−−), transglutaminase-treated caseinate (−●–) or whey protein (··▽··). Values are means ± SEM, n = 10, a) whey protein different from Cas-TG (P<0.05), b) whey protein different from Cas (P<0.05).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3412744&req=5

Figure 3: Changes in the concentration of plasma glutamic acid (A), lysine/tyrosine (B), isoleucine (C), leucine (D), tryptophan (E), histidine (F), valine (G), phenylalanine (H) and proline (I) during the 240 min postprandial period in young individuals consuming beverages composed of caseinate (−−○−−), transglutaminase-treated caseinate (−●–) or whey protein (··▽··). Values are means ± SEM, n = 10, a) whey protein different from Cas-TG (P<0.05), b) whey protein different from Cas (P<0.05).
Mentions: Plasma amino acid profiles with significant differences among the test products are shown in Figures 3 and 4.

Bottom Line: Studies on the postprandial effects of enzymatic crosslinking of milk proteins are sparse.Appetite ratings or subsequent energy intake did not differ among the protein beverages.Our results indicate that the metabolic responses of enzymatically crosslinked and native sodium caseinate in a liquid matrix are comparable, suggesting similar digestion and absorption rates and first pass metabolism despite the structural modification of Cas-TG.

View Article: PubMed Central - HTML - PubMed

Affiliation: Food and Health Research Centre, Department of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland. kristiina.juvonen@uef.fi

ABSTRACT

Background: Postprandial metabolic and appetitive responses of proteins are dependent on protein source and processing technique prior to ingestion. Studies on the postprandial effects of enzymatic crosslinking of milk proteins are sparse. Our aim was to study the effect of transglutaminase (TG)-induced crosslinking of sodium caseinate on postprandial metabolic and appetite responses. Whey protein was included as reference protein.

Methods: Thirteen healthy individuals (23.3 ± 1.1 y, BMI 21.7 ± 0.4 kg/m2) participated in a single-blind crossover design experiment in which the subjects consumed three different isovolumic (500 g) pourable beverages containing either sodium caseinate (Cas, 29 g), TG-treated sodium caseinate (Cas-TG, 29 g) or whey protein (Wh, 30 g) in a randomized order. Blood samples were collected at baseline and for 4 h postprandially for the determination of plasma glucose, insulin and amino acid (AA) concentrations. Gastric emptying (GE) was measured using the 13 C-breath test method. Appetite was assessed using visual analogue scales.

Results: All examined postprandial responses were comparable with Cas and Cas-TG. The protein type used in the beverages was reflected as differences in plasma AA concentrations between Wh and Cas, but there were no differences in plasma glucose or insulin responses. A tendency for faster GE rate after Wh was detected. Appetite ratings or subsequent energy intake did not differ among the protein beverages.

Conclusions: Our results indicate that the metabolic responses of enzymatically crosslinked and native sodium caseinate in a liquid matrix are comparable, suggesting similar digestion and absorption rates and first pass metabolism despite the structural modification of Cas-TG.

Show MeSH