PROCESS OPTIMIZATION OF GREEN AQUEOUS-BASED EXTRACTION TECHNOLOGY OF <i>TARAXACUM KOK-SAGHYZ</i> RUBBER

Zhao, Runze; Liu, Genshi; Fu, Rongzhen; Zhang, Jiaheng; Xiang, Jie; Dong, Yiyang; He, Zhili; Nie, Qiuhai

doi:10.5254/rct.22.77883

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…For the NR extraction from TKS-root material, the following groups of extraction methods were previously used: Solvent extraction, , enzymatic pre-extraction of lignocellulose, − bacterial/fungal pre-extraction of lignocellulose, − latex extraction, − or a variation of different mechanical extraction methods. − For mechanical extraction, Eskew , developed a two-stage ball mill (pebble mill) extraction. The function of the first stage was to separate softened or degraded cells from rubber tubes, thus elevating the rubber content relative to dry mass in the ball mill and to exclude biomass so that a higher throughput was achieved in the extraction system .…”

Section: Introductionmentioning

confidence: 99%

“…To improve the efficiency of the extraction systems, different pre- and post-treatments were previously introduced into the extraction systems. The first stage of the extraction system was replaced by different approaches like enzymatic, − biological decomposition − treatments, mechanical precrushing like premincing the roots, , or other chemical treatments like leaching. , But even with these different approaches, Salehi et al pointed out that there is an imminent need to improve the extraction system.…”

Section: Introductionmentioning

confidence: 99%

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Insight into Mechanical Extraction Mechanisms of Natural Rubber Extraction from Taraxacum kok-saghyz

Fichtner,

Fathelbab,

Weißgraeber

2024

ACS Agric. Sci. Technol.

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The only commercially relevant source for natural rubber (NR) is the Para rubber tree, Hevea brasiliensis. The need to find new sources of NR is increasing rapidly due to challenges from climate change and environmental impacts. NR from Taraxacum kok-saghyz (TKS) is a promising alternative. To compete with the pricing of NR from the rubber tree, an economically viable extraction system with a high output of NR is needed. The mechanisms involved in the separation of rubber from other plant constituents and potential rubber agglomeration during mechanical extraction processes are described through experimental results but not as extraction models. To analyze these mechanisms, two different wet-mill extraction system setups are investigated in this study: single-stage extraction and two-stage extraction with premilling. Two extraction models for mechanical rubber extraction mechanisms are identified and described: (i) the Model of Rolling Shear Mechanism with mild extraction behavior and rubber agglomeration, and (ii) the Model of Abrasion Shear Mechanism, which limits the rubber yield and promotes fast rubber agglomeration. The insights into the mechanisms are described and discussed through sieve analysis, rubber yield, dirt content, microscopic analyses, and viscoelastic analyses of the extracted rubber.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insight into Mechanical Extraction Mechanisms of Natural Rubber Extraction from Taraxacum kok-saghyz

Fichtner,

Fathelbab,

Weißgraeber

2024

ACS Agric. Sci. Technol.

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Drought stress alters rubber molecular weight and relative expression levels of key genes -involved in natural rubber production in rubber dandelion, Taraxacum kok-saghyz

Mofidi,

Naghavi,

Sabokdast

et al. 2023

Preprint

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Natural rubber (NR) is a vital raw material for many industries, but its main source, Hevea brasiliensis, is vulnerable to diseases and climate change. Taraxacum kok-saghyz (rubber dandelion, TKS) is an alternative source of NR that can grow in temperate regions. This study investigated the effect of drought stress on NR biosynthesis and quality in TKS roots. Drought stress didn’t affect the total rubber content, but increased the molecular weight (Mw) of the rubber significantly. The highest Mw was observed under severe drought stress, which also induced the highest expression of CPT and SRPP genes, which are involved in NR production. The rubber from TKS roots (TNR) had a high Mw of 994,000 g/mol under normal irrigation and a low glass transition temperature (Tg) of below − 60°C, indicating its industrial potential. Drought stress also increased the levels of proline, H2O2, MDA, and antioxidant enzymes (CAT, APX, GPX) in TKS roots, indicating a drought response mechanism. These results suggest that TKS can produce good quality NR under drought stress conditions and can be cultivated in regions with water scarcity.

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LATEX AGGLOMERATION AND COAGULATION IN LATICIFERS OF LIVE TARAXACUM KOK-SAGHYZ (RUBBER DANDELION) ROOTS

Abdul Ghaffar,

Cornish

2024

Rubber Chemistry and Technology

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The commercialization of Taraxacum kok-saghyz (rubber dandelion) as an alternative rubber crop requires fundamental knowledge of latex and rubber yield and quality. Rubber particles are formed in the root laticifers from Golgi bodies via the vesicular trafficking system in the cytosol and are then translocated into the vacuoles for storage. However, when freshly harvested roots are processed to extract the latex (an aqueous suspension of rubber particles), much of the latex has already coagulated into solid rubber reducing the commercial viability of latex extraction from this species. The process of in vivo loss of the latex fraction was investigated histologically, by transmission electron microscopy, in roots of plants grown in soil or hydroponically. In both root types, some rubber particles agglomerated in the cytosol as a precursor to coagulation. Other rubber particles agglomerated then coagulated after rubber particles were translocated into vacuoles, and also after the cell internal cytoplasmic structure degraded. Uniquely large rubber particles were formed in the vacuoles of hydroponically-grown plants by particle coalescence but were not found in soil-grown roots. Eventually, some root laticifers of both root types filled with solid rubber. The instability of the aqueous latex phase post-ontogeny through rubber particle agglomeration, coalescence and coagulation suggests that commercial processes likely would involve root drying to convert residual latex into solid rubber followed by aqueous- or solvent-based extraction.

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PROCESS OPTIMIZATION OF GREEN AQUEOUS-BASED EXTRACTION TECHNOLOGY OF TARAXACUM KOK-SAGHYZ RUBBER

Cited by 3 publications

References 19 publications

Insight into Mechanical Extraction Mechanisms of Natural Rubber Extraction from Taraxacum kok-saghyz

Insight into Mechanical Extraction Mechanisms of Natural Rubber Extraction from Taraxacum kok-saghyz

Drought stress alters rubber molecular weight and relative expression levels of key genes -involved in natural rubber production in rubber dandelion, Taraxacum kok-saghyz

LATEX AGGLOMERATION AND COAGULATION IN LATICIFERS OF LIVE TARAXACUM KOK-SAGHYZ (RUBBER DANDELION) ROOTS

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