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Browsing by Author "Horak, RM"

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An appetite suppressant from Hoodia species

Author: Van Heerden, FR ; Horak, RM ; Maharaj, VJ ; Vleggaar, R ; Senabe, JV ; Gunning, PJ Date: Apr 2007 Two new pregnane glycosides were isolated by fractionation of the dried stems of Hoodia gordonii. Their structures were determined as 3beta-[beta-D-thevetopyranosyl-(1→4)-beta-D-cymaropyranosyl-(1→4)-beta-D-cymaropyranosyloxy]-12beta-tigloy ... Read more
Bakers yeast-mediated transformations of alpha-keto epoxides

Author: Meth-Cohn, O ; Horak, RM ; Fouché, Gerda Date: 07 Jun 1994 Alpha beta-Epoxy ketones on treatment with baker's yeast yield different types of products depending on their substitution. Small groups such as H or Me attached at the epoxy end protect that end from attack. Thus, 1-acyl epoxides with H, ... Read more
Hoodia, a case study at CSIR

Author: Maharaj, VJ ; Senabe, JV ; Horak, RM Date: Nov 2008 An appetite suppressant agent from Hoodia developed by CSIR scientists, promises to become the first natural food ingredient for weight management based on a plant indigenous to the African continent. The research programme that led to this ... Read more
Novel baker's yeast catalysed hydride reduction of an epoxide moiety

Author: Horak, RM ; Learmonth, RA ; Maharaj, VJ Date: 27 Feb 1995 The preparation of 2-[2H]-l-(p-nitrophenyl)-1,2-epoxyheptan-3-one and its subsequent reduction by baker's yeast to the 2,3-diol is described. The mechanism of the reduction of the epoxide was determined using the B-2H isotope shift in 3C ... Read more
Stereochemical course of ring formation in fumitremorgin-B and verruculogen, metabolites of pennincillim-verrucuilosum-investigation into the loss of stereochemical

Author: Vleggaar, R ; Horak, RM ; Maharaj, VJ Date: Feb 1993 Incorporation studies of [2-(2)H(3),2-(13)C].acetate and different [2H, 13C]-labelled mevalonolactones into verruculogen established the stereochemical course of ring C formation in fumitremorgin B, which results in the loss of stereochemical ... Read more

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Browsing by Author "Horak, RM"

Browsing by Author "Horak, RM"

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