Viscometric method for determining rubber content in guayule (Parthenium argentatum Gray)

Smith, Micholas Dean

doi:10.1021/jf00065a038

Cited by 6 publications

(2 citation statements)

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“…The phosphate was then quantitated photometrically (164). The viscosity of cyclohexane solution of guayule rubber was used as a measure of rubber content (165). Ozone degradation products from rubbers were studied by IR (166).…”

Section: Miscellaneous Techniquesmentioning

confidence: 99%

Rubber

Krishen¹

1987

Anal. Chem.

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This review covers methods for identification, characterization, and determination of rubber and material in rubber.Literature that became available to the author between November 1984, the end of the period covered by the last review in the series (1), and December 1986 is reviewed.Abbreviations recommended in ASTM Designation D1418-85 have been used. These are listed in Table I. GENERAL INFORMATIONThe American Society for Testing and Materials published their latest annual edition of test methods for rubber in 1985 (2). Determination of surface tension of rubber latex was the subject of International Organization for Standards' (ISO) International Standard 1409-1982. A recent book by Compton (4) covers various aspects of chemical and physical methods for the analysis of polymers.

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Section: Miscellaneous Techniquesmentioning

confidence: 99%

Rubber

Krishen¹

1987

Anal. Chem.

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“…This method proves suitable for rapid, high-throughput detection, offering a new avenue for the quantitative determination of rubber content in TKS. Natural rubber latex [32] Viscometry Method Viscometry with temperature control Linear correlation with weight (R 2 = 0.94) and IR (R 2 = 0.99) methods Guayule plant material [33] Refractive Index Method…”

Section: Introductionmentioning

confidence: 99%

Rapid Determination of Taraxacum kok-saghyz Rubber Content Using a Pyrolyzer Hyphenated with a Miniaturized Mass Spectrometer

Gao,

Guo,

Gao

et al. 2024

Separations

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Taraxacum kok-saghyz (TKS), a rubber-producing plant with excellent potential, emerges as a viable substitute for rubber tree (Hevea brasiliensis). While natural rubber is a desirable material, conventional techniques for assessing rubber content have faced challenges in meeting practical production requirements. To address this issue, we have developed a pyrolysis–mass spectrometry (PY-MS) instrument for the quantitative evaluation of natural rubber (NR) content in rubber-producing plants. The derived standard curve equation, established for the detection of TKS dry weight through external standard calibration, demonstrates a correlation coefficient (R2) surpassing 0.99. The method exhibits commendable recovery rates (93.27–107.83%), relative standard deviations (RSD ≤ 3.93%), and a swift analysis time of merely 10 min per sample, thereby enabling accurate and efficient quantification of NR dry weight. Additionally, the PY-MS system we designed can be modified for vehicular use, enabling on-site, in situ analysis, and it provides substantial support for TKS breeding and propagation efforts. This approach possesses significant potential for extensive utilization in the assessment of rubber content in rubber-producing plants other than TKS. The integration of pyrolysis–mass spectrometry for the identification of polymers with high molecular weight offers a valuable pathway for the examination of diverse polymers.

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Characterization of Natural “Cooling” Compounds Formed from Glucose and l-Proline in Dark Malt by Application of Taste Dilution Analysis

Ottinger

Bareth

Hofmann

2001

J. Agric. Food Chem.

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Gel permeation chromatography of the solvent extractables isolated from a thermally treated glucose/L-proline mixture and sensory analysis of the fractions collected led to the discovery of the presence of "cooling" compounds in Maillard reactions. To characterize the key compounds imparting this cooling sensation to the oral cavity, a taste dilution analysis was performed by determining the taste threshold of reaction products in serial dilutions of HPLC fractions to select the most intense "cooling" compounds in the complex GPC fraction of the Maillard reaction mixture. Systematic (13)C-labeling experiments and GC-MS, LC-MS, and 1D- and 2D-NMR measurements, followed by synthesis, led to the unequivocal identification of 3-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one (3-MPC), 5-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one (5-MPC), and 2,5-dimethyl-4-(1-pyrrolidinyl)-3(2H)-furanone (DMPF) as the key compounds contributing the most to the cooling sensation. Although these structures were described earlier with regard to Maillard reactions, this is the first time that Maillard reaction products are reported to cause intense cooling sensations by degustation. Finally, the detection of 5-MPC (101.3 microg/kg), 3-MPC (9.4 microg/kg), and DMPF (11.5 microg/kg) in dark malt verified their natural occurrence in thermally processed foods.

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Viscometric method for determining rubber content in guayule (Parthenium argentatum Gray)

Cited by 6 publications

References 3 publications

Rubber

Rubber

Rapid Determination of Taraxacum kok-saghyz Rubber Content Using a Pyrolyzer Hyphenated with a Miniaturized Mass Spectrometer

Characterization of Natural “Cooling” Compounds Formed from Glucose and l-Proline in Dark Malt by Application of Taste Dilution Analysis

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