Novel end-chain and midchain functional macrophotoinitiators of poly(ε-caprolactone) have
been synthesized. For this purpose, mono- and dihydroxy functional photoinitiators namely, benzoin (B)
and 2-hydroxy-2-methyl-1-phenyl propan-1-one (HMPP), Darocure 1173, and 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methyl propan-1-one (HE-HMPP), Irgacure 2959, respectively, were used as initiators
for the stannous-2-ethylhexanoate (Sn(Oct)2) catalyzed living ring-opening polymerization of ε-caprolactone.
The gpc and IR, H NMR, UV, and fluorescence spectroscopic studies revealed that low-polydispersity
poly(ε-caprolactone) with desired photoinitiator functionality at the end or in the middle of the chain
were obtained. These prepolymers were used to induce radical polymerization of methyl methacrylate
(MMA) upon irradiation via α-cleavage of the incorporated phenyl ketone groups. While end-chain
functional macrophotoiniators led to the formation of both homo and block copolymers, only block
copolymers of ε-CL and MMA were formed with midchain functional macrophotoinitiator. Successful
blocking has been confirmed by a strong change in the molecular weight of the prepolymer and the block
copolymer as well as by NMR spectral measurements.
Background: Medication errors in oncology may cause severe clinical problems due to low therapeutic indices and high toxicity of chemotherapeutic agents. We aimed to investigate unintentional medication errors and underlying factors during chemotherapy preparation and administration based on a systematic survey conducted to reflect oncology nurses experience. Materials and Methods: This study was conducted in 18 adult chemotherapy units with volunteer participation of 206 nurses. A survey developed by primary investigators and medication errors (MAEs) defined preventable errors during prescription of medication, ordering, preparation or administration. The survey consisted of 4 parts: demographic features of nurses; workload of chemotherapy units; errors and their estimated monthly number during chemotherapy preparation and administration; and evaluation of the possible factors responsible from ME. The survey was conducted by face to face interview and data analyses were performed with descriptive statistics. Chi-square or Fisher exact tests were used for a comparative analysis of categorical data. Results: Some 83.4% of the 210 nurses reported one or more than one error during chemotherapy preparation and administration. Prescribing or ordering wrong doses by physicians (65.7%) and noncompliance with administration sequences during chemotherapy administration (50.5%) were the most common errors. The most common estimated average monthly error was not following the administration sequence of the chemotherapeutic agents (4.1 times/month, range 1-20). The most important underlying reasons for medication errors were heavy workload (49.7%) and insufficient number of staff (36.5%). Conclusions: Our findings suggest that the probability of medication error is very high during chemotherapy preparation and administration, the most common involving prescribing and ordering errors. Further studies must address the strategies to minimize medication error in chemotherapy receiving patients, determine sufficient protective measures and establishing multistep control mechanisms.
ABSTRACT:We describe here a novel approach to photoinitiate free radical and cationic polymerizations concurrently, involving the use of benzoin in conjunction with an onium salt such as diphenyl iodonium or N-alkoxy pyridinium salt. On photolysis, benzoyl radicals formed from the decomposition of benzoin initiate free radical polymerization of methyl methacrylate. The hydroxy benzyl radicals formed concomitantly are readily oxidized to the corresponding cation by the onium salt to initiate cationic polymerization of cyclohexene oxide in the same system. Evidence for two independent polymerizations was obtained from studies involving gel permeation chromatography, extractions, and infrared and proton nuclear magnetic resonance analysis of the polymers. The effect of the type of the onium salt on each polymerization was also investigated.
A novel well‐defined macromonomer of cyclohexene oxide (CHO) functional poly(ε‐caprolactone) (PCL) has been synthesized. For this purpose 3‐cyclohexene‐1‐methanol was used as the “initiator” for the stannous‐2‐ethylhexanoate [Sn(Oct)2] catalyzed living ring‐opening polymerization of ε‐caprolactone (CL). Epoxidation of the obtained polymer by using 3‐chloroperoxybenzoic acid results in CHO end‐functional macromonomer of PCL. The GPC and H NMR studies revealed that PCL with low polydispersity and desired end functionality was obtained. The photoinduced cationic homo‐ and copolymerization of this macromonomer with CHO gave poly(macromonomer) and graft copolymers with PCL side chains, respectively. Photoinduced cationic polymerizations were achieved by using diphenyliodonium hexafluorophosphate in the presence and absence of a radical source such as 2,2‐dimethoxy‐2‐phenylacetophenone or sensitizer such as anthracene.
Adjuvant chemotherapy may contribute to an increased risk for metabolic syndrome in patients with BC and these changes are more profound in pre-menopausal patients.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.