Wertvolle Kautschukpflanzen des gemässigten Klimas

Ulmann, M.

doi:10.1515/9783112529980

Cited by 26 publications

(18 citation statements)

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“…17%, which is significantly lower than reported for flow extractions on a laboratory scale, in which total yields of up to ∼50% extractable latex were achieved. 9,17 In large-scale experiments, however, poorer results were also reported. 17 It was evident that the majority of the differences were due to the removed root material.…”

Section: Acs Agriculturalmentioning

confidence: 99%

“…9,17 In large-scale experiments, however, poorer results were also reported. 17 It was evident that the majority of the differences were due to the removed root material. Although a final assessment was not possible, this might be explained for several reasons.…”

Section: Acs Agriculturalmentioning

confidence: 99%

“…Parts of the latex were still trapped in the laticifers and removed along with the root material. However, it was assumed that given the intense soaking of the root slices and the structure of the laticifers, 17 this aspect was seen as not critical. It is more likely that latex particles were actually released from the laticifers and thereafter remained in a dispersed state within the root material as part of the extract.…”

Section: Acs Agriculturalmentioning

confidence: 99%

“…9 A process for concentrations of up to 50% was outlined. 17,18 While usual concentrations of ca. 35% were described for applications such as latex dipping, concentrations of ca.…”

Section: Introductionmentioning

confidence: 99%

“…Attempts to extract and concentrate NRL from TKS have also been reported, which show that extraction is possible by mechanical processing of the roots. ,,, The concentration was achieved by centrifugation and creaming or flotation, and NRL with a concentration of up to 35% was isolated . A process for concentrations of up to 50% was outlined. , While usual concentrations of ca. 35% were described for applications such as latex dipping, concentrations of ca.…”

Section: Introductionmentioning

confidence: 99%

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Isolation and Investigation of Natural Rubber Latex from Taraxacum kok-saghyz with a High Solid Content

Ramsauer

Polzer

Kunz

2022

ACS Agric. Sci. Technol.

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Roots of Taraxacum kok-saghyz (TKS) are a promising alternative source of natural rubber latex (NRL). This study demonstrated the novel possibility of extracting, stabilizing, and concentrating NRL from roots of TKS with a high solid content. In addition, some colloidal characteristics of the isolated products, which are of interest for latex processing, were determined. A scaled-up extraction sequence based on previous studies of flow extraction was applied with a setup comprised of an industrial slicer, stirring stations, and a hydraulic press. Significant amounts of natural rubber (NR) were separated along with removed biomass. Stabilization of NRL was successfully maintained during latex isolation using ammonia-free stabilizing solutions consisting of an ethanolamine/ethanolamine hydrochloride (ETA/ETA-HCl) buffer, sodium oleate, sodium sulfite, and benzalkonium chloride. Purified and preconcentrated raw latex was obtained through repeated creaming and redilution. While a direct further concentration of raw latex proved difficult, the isolation of latex with a high solid content was achieved through redilution before the final centrifugation. Gravimetry indicated a solid content of >54%. The products were characterized by a high viscosity, and dilution was possible without coagulation. ζ-potential (ZP) was determined to be −60 mV and approved the successful stabilization of high solid latex. Dynamic light scattering (DLS) confirmed the possibility of maintaining a bimodal particle size distribution (PSD) with hydrodynamic diameters of 104–231 nm for the first mode and 522–830 nm for the second mode.

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Section: Acs Agriculturalmentioning

confidence: 99%

Section: Acs Agriculturalmentioning

confidence: 99%

Section: Acs Agriculturalmentioning

confidence: 99%

“…9 A process for concentrations of up to 50% was outlined. 17,18 While usual concentrations of ca. 35% were described for applications such as latex dipping, concentrations of ca.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isolation and Investigation of Natural Rubber Latex from Taraxacum kok-saghyz with a High Solid Content

Ramsauer

Polzer

Kunz

2022

ACS Agric. Sci. Technol.

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Rubber, 2. Natural

Greve¹

2000

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Rubber Extraction 3. Composition of Natural Rubber Latex 4. Biosynthesis of Natural Rubber 5. Commercial Extraction of Natural Latex 6. Production of Natural Rubber 6.1. Extraction by Evaporation of Water (Evaporation, Spray Drying) 6.2. Coagulation 7. Classification 7.1. Technically Classified (TC) Rubber 7.2. Standard Malaysian Rubber (SMR) 7.3. Standardized Indonesian Rubber (SIR) 8. Physical and Technological Properties of Solid Rubber 9. Uses 10. Modification 10.1. Hydrogenated Natural Rubber 10.2. Chlorinated Natural Rubber 10.3. Hydrohalogenated Natural Rubber 10.4. Cyclized Natural Rubber 10.5. Resin‐Modified Natural Rubber 10.6. Poly(Methyl Methacrylate)‐Grafted Natural Rubber 10.7. Superior‐Processing Natural Rubber 10.8. N ‐Phenylcarbamoylazoformate‐Modified Natural Rubber 10.9. Polystyrene‐Grafted Natural Rubber 10.10. Epoxidized Natural Rubber (ENR) 10.11. Degraded Natural Rubber 10.12. Thermoplastic Natural Rubber 11. Compounding 12. Summary

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Die Glykoside der Rhizome von Apocynum cannabinum L. 3. Mitteilung. Glykoside und Aglykone, 208. Mitteilung

Gołab

Trabert

Jäger

et al. 1959

Helvetica Chimica Acta

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Aus einem Glykosid‐Konzentrat aus Apocynum cannabinum L. wurde neben den beiden schon früher isolierten Glykosiden Cymarin und Apocannosid noch ein drittes Glykosid in Kristallen isoliert und Cynocannosid genannt. Hydrolyse des letzteren gab L‐Oleandrose und dasselbe Genin, das auch in Apocannosid enthalten ist. Es wurde Cannogenin genannt. Durch Umsatz mit Propandithiol‐(l, 3) und anschliessende katalytische Entschwefelung liess es sich in Digitoxigenin überführen. Damit ist die Struktur des Genins entsprechend Formel IV bewiesen.

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Wertvolle Kautschukpflanzen des gemässigten Klimas

Cited by 26 publications

References 0 publications

Isolation and Investigation of Natural Rubber Latex from Taraxacum kok-saghyz with a High Solid Content

Isolation and Investigation of Natural Rubber Latex from Taraxacum kok-saghyz with a High Solid Content

Rubber, 2. Natural

Die Glykoside der Rhizome von Apocynum cannabinum L. 3. Mitteilung. Glykoside und Aglykone, 208. Mitteilung

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