A novel needle trap device with nanoporous silica aerogel packed for sampling and analysis of volatile aldehyde compounds in air

Developing a Method for Determination of Urinary Delta-Amino-Levulinic Acid using Molecularly Imprinted Polymers

“…These materials can be either parts of a specimen or reagents, including diluent or wash solution. In this research "carry over" means the amount of analytes or washing solution which remains in the memory of MIP bed after elution of the sample [20]. In MEPS, the absorbent is washed several times to prevent the memory effect.…”

A comprehensive methodology based on NTME/GC-MS data and chemometric tools for lemons discrimination according to geographical origin

“…Currently, solid phase microextraction (SPME) is a well-established technique in the field of VOCs analysis [11][12][13], but its extraction capacity is hindered by the small amount of sorbent normally used (60-100 μm). As a nonexhaustive technique, SPME efficiency depends of the mass transfer between a small portion of analytes toward the extracting media, and large amounts of analytes remain in the sample solution/matrix [11,14,15]. Such drawback is more critical for low abundant VOCs, whose identification is often not possible.…”

“…In NTME, VOCs are forced to cross over the sorbent packed inside the needle, being the analytes trapped into sorbent [15][16][17][18][19]23,24]. Thus, the choice of an appropriate sorbent material is one of the critical factors to obtain a good recovery and high enrichment factors [11,[16][17][18][19].…”

“…Thus, the choice of an appropriate sorbent material is one of the critical factors to obtain a good recovery and high enrichment factors [11,[16][17][18][19]. There are several sorbents commercially available, such as divinylbenzene (DVB), polydimethylsiloxane (PDMS), DVB and Carboxen particles Carbopack X, Tenax TA, Porapak Q, as well different sorbents combinations [9,10,[15][16][17][18][19]23]. Nevertheless, to further improve selectivity and specificity towards target compounds, new sorbent materials, including synthetic polymers and nanostructured based materials, are being developed.…”

Resorcinol–formaldehyde aerogel coating for in‐tube solid‐phase microextraction of estrogens

“…Based on the unique advantages, different kind of aerogels have been developed and applied to many fields . Silica aerogels , graphene aerogels , and carbon aerogels were developed for SPME or SPE. Our group prepared an organic hybrid silica aerogel and an ionic liquid‐functionalized silica aerogel as the coatings for fiber SPME, and also produced melamine–formaldehyde aerogel , ionic liquid modified melamine–formaldehyde aerogel , and organic–inorganic hybrid silica aerogel for in‐tube SPME sorbents.…”