Rapid and complete removal of guayule (Parthenium argentatum) leaves by cryodefoliation, and freeze and thaw induction of rubber particle coagulation

Bates, Griffin M.; Cornish, Katrina

doi:10.1016/j.indcrop.2018.09.041

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…8). The conversion of latex (aqueous emulsion of rubber particles) into solid rubber within living tissues can be induced by freeze-thaw cycles (Bates and Cornish, 2018), but the mechanism underlying rubber particle coagulation during the growing season is not yet understood. Nevertheless, this behavior means that this species is not currently a good candidate for latex production, but rather a source of solid rubber.…”

Section: Discussionmentioning

confidence: 99%

“…These grinding times were determined from preliminary experiments using grinding time courses to determine the duration needed for complete extraction of rubber particles [as described for guayule in Cornish et al (1999)]. Latex was quantified as described previously (Bates and Cornish, 2018). Homogenate was transferred to medium-size weigh boats (top diameter, 67 mm) (Fisherbrand, Fisher Scientific) and placed in a 50°C drying oven until completely dry.…”

Section: Methodsmentioning

confidence: 99%

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Planting Density and Growth Cycle Affect Actual and Potential Latex and Rubber Yields in Taraxacum kok-saghyz

Bates¹,

Mcnulty²,

Amstutz³

et al. 2019

horts

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Rubber dandelion (Taraxacum kok-saghyz, Rodin) is being developed as a temperate-zone source of rubber, but best agronomic practices must be determined before it can become a viable supplement to imported rubber produced from para rubber tree (Hevea brasiliensis, hevea) plantations located mostly in Southeast Asia. In our study, the effect of planting density and harvest time on yield was determined by transplanting 1.5-month-old greenhouse-produced plants at planting densities of 1.24, 2.47, 4.94, and 9.88 million plants/ha, randomized across four planting boxes with two densities per box (i.e., two planting areas at each density). Half of each planting area was selected randomly and hand-harvested after 6 months, and the remaining plants were hand-harvested after 1 year. Rubber yields per plant were greater after 1 year than after 6 months, but yields per unit area were similar as a result of the loss of half the plants during the severe 2013–14 Ohio winter. A maximum rubber yield of 960 kg dry rubber/ha was obtained from the 9.88 million-plants/ha planting density after 1 year, but root size was significantly decreased compared with lower densities, and appeared too small for mechanical harvest. A planting density between 2.47 and 4.94 million plants/ha may produce the optimal combination of root size and total rubber yield. Greater rubber concentrations, faster-growing plants, short-season germplasm, and in-field weed control are required before yields obtained in outdoor planting boxes can be matched or exceeded on farms, especially in a direct-seeded rubber dandelion crop.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Planting Density and Growth Cycle Affect Actual and Potential Latex and Rubber Yields in Taraxacum kok-saghyz

Bates¹,

Mcnulty²,

Amstutz³

et al. 2019

horts

Self Cite

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“…As guayule leaves contain negligible amounts of rubber compared to branches, they represent a waste by-product [9] in the rubber extraction processes from its biomass. In fact, the complete removal of leaves before homogenization is a necessary step to produce high-quality latex, avoiding fine solids contamination mostly attributable to the co-homogenized leaves [10]. As regards the presence of bioactive compounds in leaves of guayule, Mears [11] reported the distribution of 34 flavonoids detected in leaves of North American Parthenium spp.…”

Section: Introductionmentioning

confidence: 99%

Bioactive Compounds from Leaves and Twigs of Guayule Grown in a Mediterranean Environment

Piluzza

Campesi

Molinu

et al. 2020

Plants

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Guayule (Parthenium argentatum) is one of the most promising alternatives to produce natural rubber. As the guayule leaves represent a waste byproduct in the rubber extraction process, their exploitation might contribute to the valorization of the whole plant biomass. The specific aim of our study was to determine the antioxidant capacity and the content of phenolic compounds in leaves and twigs of different guayule lines cultivated in a Mediterranean environment. The antioxidant capacity and the contents of phenolic were affected significantly by guayule accession and harvest time. Overall means in twigs represented about 60% of the corresponding leaf values for antioxidant capacity as DPPH (1,1-diphenyl-2-picrylhydrazyl) and not tannic phenolic and about 55% as ABTS (2,2′-azinobis (3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt), total phenolic, tannic phenolic and total flavonoid contents. Five individual phenolic compounds were identified in methanolic extracts of leaves. Neochlorogenic acid (62.5–174.8 mg g−1 DW) and chlorogenic acid (28.6–41.1 mg g−1 DW) were the most abundant phenolic acids. In addition to the compounds quantified in leaves, cynarin was identified only in twigs and for the first time in guayule biomass. Our results indicate that guayule leaves and twigs represent a rich source of antioxidants for potential applications in fodder, nutraceutical and pharmacological sectors.

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Current trends in bio‐based elastomer materials

Tang

Wang

et al. 2022

SusMat

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Elastomers play an irreplaceable role in our society due to their unique properties. Natural rubber is directly obtained from plants and is widely used in tires, shoes, etc. Recently, modified natural rubbers are proposed to expand the application of natural rubber. However, these natural rubbers have a limited variety of molecular structures and may not be able to meet ever-demanding applications. Traditional synthetic elastomers have a variety of molecular structures and their properties are used in various fields, but mainly originate from fossil resources. This review deals with bio-based elastomers, and more specifically natural rubber and bio-based synthetic elastomers. Based on reprocessability, bio-based elastomers can also be divided into bio-based chemically cross-linked ones and thermoplastic ones. Compared to traditional fossil-based elastomers, bio-based ones may alleviate environmental pollution and promote the sustainable development of the elastomer industry. K E Y W O R D Sbio-based elastomers, chemically cross-linked, natural rubber, synthetic rubber INTRODUCTIONElastomers are polymeric materials possessing low modulus and high elasticity, and can rapidly recover their orig-This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Rapid and complete removal of guayule (Parthenium argentatum) leaves by cryodefoliation, and freeze and thaw induction of rubber particle coagulation

Cited by 7 publications

References 12 publications

Planting Density and Growth Cycle Affect Actual and Potential Latex and Rubber Yields in Taraxacum kok-saghyz

Planting Density and Growth Cycle Affect Actual and Potential Latex and Rubber Yields in Taraxacum kok-saghyz

Bioactive Compounds from Leaves and Twigs of Guayule Grown in a Mediterranean Environment

Current trends in bio‐based elastomer materials

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