π-hole bonding: A new retention mechanism for the solid phase extraction of polycyclic aromatic hydrocarbons from the hexane extracts of soil samples.

In this work, the perfluorobenzene-bonded silica sorbent was tested to adsorb polycyclic aromatic hydrocarbons in hexane. In the comparison experiments, the perfluorobenzene-bonded sorbent's performance was better than octadecyl silica sorbent and phenyl-bonded silica sorbents, which indicated that the π-hole···π bonds between perfluorobenzene and the polycyclic aromatic hydrocarbons were stronger than π···π interactions and hydrophobic interactions in hexane. Then the perfluorobenzene-bonded silica sorbent was applied to solid-phase extraction of 15 polycyclic aromatic hydrocarbons from the hexane extracts of soil samples directly without the solvent replacement, which simplified the soil pretreatment process. And the results showed that under the optimal conditions, the proposed method for the determination of polycyclic aromatic hydrocarbons in the environment soil presented good recoveries and stabilities for the 10 heavier polycyclic aromatic hydrocarbons with the recoveries ranging from 75.1% to 104.6% and the relative standard deviations being in the range of 1.4%-5.8%. The limits of detection of the method varied from 0.1 to 2 ng/g. This work reveals the great application potential of the π-hole bond as a new retention mechanism in the field of solid-phase extraction.

Perforation of Gastric Wall by Polymethylmethacrylate after Percutaneous Kyphoplasty: Case Report and Literature Review.

Kyphoplasty is a minimal invasive technique with a low rate of complications. To the best of our knowledge, perforation of gastric wall following kyphoplasty has not been described yet. We present a case that was operated for radical resection of esophageal carcinoma eleven years ago and who underwent kyphoplasty after a recent sixth and seventh thoracic vertebral fracture was diagnosed. Afterwards, the patient complained of dysphagia and fever. His laboratory results showed signs of inflammation. Gastroscopy showed a foreign body in the stomach. Plain radiography, computed tomography scan and positron emission computed tomography confirmed the diagnosis of perforation of the gastric wall by polymethylmethacrylate. Despite adequate antibiotic treatment, the patient died from septic multiple organ failure. Indication for kyphoplasty in patients with any history of thoracic surgery should be scrutinized rigorously. Although this kind of complication may be relatively rare, awareness of this condition will improve our response to avoid any delay in making the correct diagnosis and providing specific treatment.