Publications by authors named "J M C Geuns"

A vision for modernization of nanotechnology innovation governance is a Safe Innovation Approach (SIA). SIA combines two concepts: Safe-by-Design (SbD) and Regulatory Preparedness (RP). SbD aims to motivate industry to integrate safety considerations early in the innovation process and onwards.

View Article and Find Full Text PDF

Aims: Steviol glycosides are the sweet components extracted from medicinal plant Bertoni, which have antihyperglycaemic effects. Steviol glucuronide (SVG) is the metabolite excreted in human urine after oral administration of steviol glycosides. We aimed to clarify whether SVG exerts direct insulin stimulation from pancreatic islets and to explore its mode of action.

View Article and Find Full Text PDF

Bertoni is a sweet medicinal herb that is cultivated worldwide. This study aimed to identify the genotypic responses and function of nine cultivars of (accession numbers 1-9 from the EUSTAS Stevia Gene Bank) to low temperature. Plants were grown and incubated under controlled conditions at 5° or 25°C for 1 month.

View Article and Find Full Text PDF

Stevia rebaudiana is a sweet herb of the Astraceae family, which is cultivated for the natural sweeteners it contains. The aim of this study was to assess the effect of drought, simulated by the application of polyethylene glycol (5%, 10%, and 15% w/v), on the content of steviol glycosides (SVglys) and transcription levels of six genes involved in the biosynthesis of these natural sweeteners. The transcription levels of ent-kaurene synthase, ent-kaurene oxidase, ent-kaurenoic acid hydroxylase, and three UDP-dependent glycosyltransferases, UGT85C2,UGT74G1 and UGT76G1 were downregulated under polyethylene glycol treatment.

View Article and Find Full Text PDF

Steviol glycosides are intense natural sweeteners used in foods and beverages. Their acceptable daily intake, expressed as steviol equivalents, is set at 0-4 mg/kg body weight. We report the development and validation of a RP-HPLC method with fluorometric detection of derivatized isosteviol, formed by acid hydrolysis of steviol glycosides.

View Article and Find Full Text PDF