Evaluation of a proton magnetic resonance technique for analysis of rubber in guayule

✍ Scribed by Robert Ferraris; Ross W Hansen; Ross W Downes; Alan D Johnson; Barry V McCleary

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 234 KB
• Volume: 58
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/jsfa.2740580418

✦ Synopsis

Abstract

Low‐resolution proton magnetic resonance (PMR) has been advocated as a rapid screening technique to determine rubber in guayule (Parthenium argentatum Gray). The technique was evaluated in two laboratories against a modification of the Soxhlet procedure using samples of guayule material collected from three varieties over a 3‐year period. At each laboratory, significant relationships between PMR signal and extracted rubber content were found for all varieties. Regressions had statistically similar slopes between varieties, but at one laboratory the intercept of one variety differed from the intercept of the regressions of the other two varieties. It was concluded that the rapidity of the PMR technique was suited to coarse comparative studies of rubber content in guayule. For absolute assessment and within varieties, rapid estimates of rubber content using PMR can be made only after establishing a specific PMR: solvent rubber relationship on similarly treated material.