Validation of analytical method for rhynchophorol quantification and stability in inorganic matrix for the controlled release of this pheromone

Abstract

A fast method for the identification and stability evaluation of the aggregation pheromone rhynchophorol, which is the main substance used for chemical communication by the beetle Rhynchophorus palmarum L., was validated. In addition, the technique was applied to the evaluation of two inorganic matrices, with the objective of using them as controlled-release devices. The analytical method showed good linearity (R2 = 0.9978), precision (CV% < 1.79), recovery (84–105%) and limits of detection (0.2 mg mL−1) and quantification (0.3 mg mL−1); in compliance with the validation legislation established by ANVISA. In the interaction study, the inorganic matrices zeolite L and Na-magadiite showed high rates of pheromone recovery without promoting its degradation for a period of 180 days, which is not reported in the literature for other matrices. The structures of the zeolite L/rhynchophorol and Na-magadiite/rhynchophorol composites showed slower release kinetics during the storage period when compared with pure pheromone, which is desirable since it extends the period of rhynchophorol release and decreases the negative effects caused by the environmental parameters.

Controlling the Uptake and Release of Semiochemicals in Channel‐Type Metal‐Organic Frameworks Through Pore Expansion

“…This suggests that inclusion of hydrophobic semiochemical guests is stabilising these MOFs towards hydrolytic decomposition by airborne moisture, something we have observed previously with IRMOFs. [23] Whilst previous studies have demonstrated that porous materials can be used to extend the release shelf-life of semiochemicals, [13][14][15][16] the zeolite or polymer materials used make it difficult to tune the rates to enable identification by and attraction of the target pest. The release profiles observed in this study clearly demonstrate the advantage of using MOFs, and potentially other modular porous materials such as covalent-organic frameworks or hydrogen-bonded organic frameworks, [48,49] for the uptake and release of these chemicalsfacilitating control over the uptake and release rate through pore engineering.…”

“…To combat this issue, a method to slow down and control the release of semiochemicals is desired. [12] Previous studies have examined porous materials, such as zeolites or crosslinked polymers, as potential solutions with some success, [13][14][15][16] but the lack of structural tunability with these materials makes controlling semiochemical loading and release difficult to achieve.…”