Effects of Unfermented and Fermented Whole Grain Rye Crisp Breads Served as Part of a Standardized Breakfast,on Appetite and Postprandial Glucose and Insulin Responses: A Randomized Cross-over Trial

Background

Whole grain rye products have been shown to increase satiety and elicit lower postprandial insulin response without a corresponding change in glucose response compared with soft refined wheat bread. The underlying mechanisms for these effects have not been fully determined The primary aim of the study was to investigate if whole grain rye crisp bread compared to refined wheat crisp bread, elected beneficial effects on appetite and postprandial insulin response, similarly as for other rye products.

Methods

In a randomized cross-over trial, 23 healthy volunteers, aged 27-70 years, BMI 18-31.4 kg/m², were served a standardized breakfast with unfermented whole grain rye crisp bread (uRCB), fermented whole grain rye crisp bread (RCB) or refined wheat crisp bread (WCB), Appetite was measured using a visual analogue scale (VAS) until 4 h after breakfast. Postprandial glucose and insulin were measured at 0-230 min. Breads were chemically characterized including macronutrients, energy, dietary fiber components, and amino acid composition, and microstructure was characterized with light microscopy.

Results

Reported fullness was 16% higher (P<0.001), and hunger 11% and 12% lower (P<0.05) after ingestion of uRCB and RCB, respectively, compared with WCB. Postprandial glucose response did not differ significantly between treatments. Postprandial insulin was 10% lower (P<0.007) between 0-120 min but not significantly lower between 0-230 min for RCB compared with WCB. uRCB induced 13% (P<0.002) and 17% (P<0.001) lower postprandial insulin response between 0-230 min compared with RCB and WCB respectively.

Conclusion

Whole grain rye crisp bread induces higher satiety and lower insulin response compared with refined wheat crisp bread. Microstructural characteristics, dietary fiber content and composition are probable contributors to the increased satiety after ingestion of rye crisp breads. Higher insulin secretion after ingestion of RCB and WCB compared with uRCB may be due to differences in fiber content and composition, and higher availability of insulinogenic branched chain amino acids.

Trial Registration

ClinicalTrials.gov NCT02011217     

The ‘Spirit’ of the Thing: The Boundaries of Aboriginal Economic Relations at Australian Common Law

Aboriginal economic relations have been misconstrued as a type of primitive exchange in at least one native title case discussed in this paper. The pursuit by Aboriginal native title claimants of recognition at law of customary economic rights as inherent in, or an adjunct of, native title rights failed in Yarmirr and Others v. Northern Territory of Australia and Others (1998) 156 ALR 370 (the ‘Croker Island case’) for several reasons. The applicant's native title was found to be non‐exclusive of other interests, and a right to trade in resources of the sea was rejected. This case was argued in part by relying on historical material regarding Macassan trading arrangements. The profound alterity of Aboriginal relationships among persons and things, as the Croker Island evidence of property and trade relations demonstrates, have been re‐constituted in legal discourse as an absence of economic relations. In this paper, we argue that there is no sound basis for the distinction made between commercial and non‐commercial native title rights, whether in the Native Title Act 1993 (Commonwealth of Australia), or in recent judicial reasoning. We contend that native title rights and interests constitute a sui generis species of property relations that enable economic rights as conceived in Aboriginal tradition and custom to circulate in the modern market. Aboriginal customary economic relations of and between Aboriginal groupings are markedly distinct from, yet not incommensurable with, the normative conception of economic relations in the Australian market. We argue that a reformulation of the current Australian legal ideas about economic life is necessary for the recognition of Aboriginal economic institutions in native title claims and other economic arenas.     

Investigation of Ochratoxin A biosynthetic genes in<Emphasis Type="Italic">Penicillium verrucosum</Emphasis> by DDRT-PCR experiments: differential expression of OTA genes

A defined minimal medium has been developed which is either restrictive or permissive for the production of ochratoxin A byPenicillium verrucosum simply by changing the nitrogen and carbon source. The combination of ammonium/glycerin promoted, whereas the combination nitrate/glucose repressed ochratoxin production.In parallel mutants ofP verrucosum have been constructed by restriction endonuclease mediated integration, which were not able to produce ochratoxin. Different types of transformants, which either produce no detectable amounts of ochratoxin A but ochratoxin α, strains which produce only ochratoxin B and strains which produces none of these secondary metabolites, have been observed.