Light Strike – Part 2

Light Strike – Part 2

Dr. Carien CoetzeeBasic Wine29 August 2021   Light-Strike occurs when riboflavin (naturally occurring in wine) is elevated to an excited state due to light exposure leading to the oxidation of amino acids which may in-turn lead to the development of particularly...
Light Strike – Part 1

Light Strike – Part 1

Dr. Carien CoetzeeBasic Wine29 August 2021   Exposure to light can potentially induce major changes to a wine’s composition. This effect mainly occurs in bottled white and rosé wines exposed to light1 and is commonly referred to as the “light-struck taste”,...
Removing copper-H2S complexes using membrane filtration

Removing copper-H2S complexes using membrane filtration

Dr. Carien Coetzee Basic Wine 30 June 2020 FOCUS ON H2S: Part 6 The entire Focus on H2S series has highlighted the importance of removing the copper-H2S complex from wine, especially in cases where copper was added as a remedial treatment for the removal of reductive...
Removing copper-H2S complexes using PVI/PVP

Removing copper-H2S complexes using PVI/PVP

Dr. Carien CoetzeeBasic Wine28 June 2020 FOCUS ON H2S: PART 5 In Part 1 of this Focus on H2S series, the implications of fining a reductive wine with copper(II)sulphate were discussed. Cu2+ will bind with H2S to form a copper-H2S complex, however, contrary to popular...