Das Ziel der vorliegenden Untersuchungen war, zu erforschen ob Zusätze aus synthetischen, hochpolymeren Substanzen wie Polyvenylpyrrolidon (PVP) ähnliche Auswirkungen auf die Kristallmorphologie von CuCl2 haben wie Pflanzensäfte. Es wurde PVP mit verschiedenen Polymerisationsgraden (K-Werten) verwendet. Es ergab sich, daß PVP K9O (welches das größte durchschnittliche Molekulargewicht aller getesteten PVP Arten besitzt) CuCl-Kristallisationsmuster hervorbringt, die alle wesentlichen Merkmale von Pflanzenzusätzen haben. In weiteren Versuchen wurden Molekulargewichtsmessungen mit Hilfe der Gel-Permeations-Chromatographie an einigen frischen und gealterten Gemüsesäften angestellt. Es ergab sich‚ daß frische Pflanzensäfte das größte gewichtsgemittelte Molekulargewicht und die größte Polydispersität aufweisen. Diese Werte sinken in den ersten 3 - 4 Tagen nach dem Pressen schnell ab. Eine Beziehung zwischen den Resultaten dieser zwei Versuchsgruppen wird aufgezeigt.
N1 -This work was undertaken to investigate whether or not the copper chloride crystallization method is indeed a sensitive indicator for formative forces in living material, as proposed in the literature. Copper chloride crystallizations from aqueous CuCl2 solutions to which polyvinylpyrrolidone (PVP) has been added have been performed with the goal to find out if synthetic polymers have similar effects on the crystal morphology of CuCl; as additions of plant juices, blood or extracts from animal organs. PVP of various degrees of polymerization (K-values) have been applied. It was found that PVP K9O (which possesses the largest average molecular weight of all PVP tested) yields CuCl2 crystallization patterns which have all essential features of those which are obtained when adding substances to CuCl2 solutions which are derived from living materials. ln further experiments, molecular weight measurements involving gel permeation chromatography have been conducted on several fresh as well as on aged vegetable juices. It was found that fresh plant juices have the largest weight average molecular weight an the largest polydispersity. These values decrease rapidly in the first three to four days of aging. A link between the results of these two types of experiments is made in the paper.
This work was undertaken to investigate whether or not the copper chloride crystallization method is indeed a sensitive indicator for formative forces in living material, as proposed in the literature. Copper chloride crystallizations from aqueous CuCl2 solutions to which polyvinylpyrrolidone (PVP) has been added have been performed with the goal to find out if synthetic polymers have similar effects on the crystal morphology of CuCl; as additions of plant juices, blood or extracts from animal organs. PVP of various degrees of polymerization (K-values) have been applied. It was found that PVP K9O (which possesses the largest average molecular weight of all PVP tested) yields CuCl2 crystallization patterns which have all essential features of those which are obtained when adding substances to CuCl2 solutions which are derived from living materials. ln further experiments, molecular weight measurements involving gel permeation chromatography have been conducted on several fresh as well as on aged vegetable juices. It was found that fresh plant juices have the largest weight average molecular weight an the largest polydispersity. These values decrease rapidly in the first three to four days of aging. A link between the results of these two types of experiments is made in the paper.