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821596 occurrences (No.5 in the rank) during 5 years in the PubMed. [no cache] 500 found

275) Recently it was demonstrated that the analysis of drugs of abuse (DOA) in wastewater can be used to track their use in communities.

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PMID:23420682 DOI:10.1002/dta.1460

2015 Drug testing and analysis

* Optimization, validation, and the application of liquid chromatography-tandem mass spectrometry for the analysis of new drugs of abuse in wastewater.

- Recently it was demonstrated that the analysis of drugs of abuse (DOA) in wastewater can be used to track their use in communities. This paper presents the optimization, validation, and application of an analytical procedure based on solid-phase extraction (SPE) and liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) for the determination of some emerging drugs in influent wastewater. The compounds of interest were the cathinone derivatives methylenedioxypyrovalerone (MDPV) and 4-methylmethcathinone (mephedrone (MEPH)), ketamine (KET) and its metabolites norketamine (NK) and dehydronorketamine (DHNK), as well as the major metabolite of cannabis, 11-nor-9-carboxy-delta-9-tetrahydrocannabinol (THC-COOH). Except for DHNK, deuterated analogues were used as internal standards for quantification. The use of a short C18 column (50 mm x 2 mm, 3 µm) allowed a good separation for the compounds analyzed in positive ionization mode (KET, NK, DHNK, MDPV, and MEPH) and for THC-COOH, which was analyzed in negative ionization mode, with a total run time of 13 min. Sample preparation using SPE was optimized by comparing Oasis HLB and Oasis MCX sorbents. The method was validated for each compound by assessing the following parameters: linearity, accuracy, precision, recovery, and relative process efficiency. The lowest calibration level was considered as the lower limit of quantification (LLOQ) and was 5 ng/l for KET, NK, DHNK, MDPV, and MEPH and 20 ng/l for THC-COOH. KET, and THC-COOH could be quantified in the majority of wastewater samples from three large wastewater treatment plants in Belgium. The other compounds were below the LLOQ or could not be detected.

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(1)263 of	(8)5 is	(15)3 by	(22)2 at
(2)34 in	(9)5 was	(16)3 it	(23)2 has
(3)24 null	(10)5 with	(17)3 these	(24)2 therapeutic
(4)24 and	(11)4 a	(18)3 were	(25)2 to
(5)8 the	(12)4 among	(19)3 when	(26)2 visual
(6)5 as	(13)3 are	(20)2 TAA
(7)5 for	(14)3 because	(21)2 acculturation,

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--- WordNet output for use --- =>利用, 使う, 利用する, (体, 能力など)を働かす, 使用, 利用法 Overview of noun use The noun use has 7 senses (first 6 from tagged texts) 1. (90) use, usage, utilization, utilisation, employment, exercise -- (the act of using; "he warned against the use of narcotic drugs"; "skilled in the utilization of computers") 2. (18) function, purpose, role, use -- (what something is used for; "the function of an auger is to bore holes"; "ballet is beautiful but what use is it?") 3. (7) use -- (a particular service; "he put his knowledge to good use"; "patrons have their uses") 4. (1) consumption, economic consumption, usance, use, use of goods and services -- ((economics) the utilization of economic goods to satisfy needs or in manufacturing; "the consumption of energy has increased steadily") 5. (1) habit, use -- ((psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition; "owls have nocturnal habits"; "she had a habit twirling the ends of her hair"; "long use had hardened him to it") 6. (1) manipulation, use -- (exerting shrewd or devious influence especially for one's own advantage; "his manipulation of his friends was scandalous") 7. use, enjoyment -- ((law) the exercise of the legal right to enjoy the benefits of owning property; "we were given the use of his boat") Overview of verb use The verb use has 6 senses (first 3 from tagged texts) 1. (603) use, utilize, utilise, apply, employ -- (put into service; make work or employ for a particular purpose or for its inherent or natural purpose; "use your head!"; "we only use Spanish at home"; "I can't use this tool"; "Apply a magnetic field here"; "This thinking was applied to many projects"; "How do you utilize this tool?"; "I apply this rule to get good results"; "use the plastic bags to store the food"; "He doesn't know how to use a computer") 2. (12) use, habituate -- (take or consume (regularly or habitually); "She uses drugs rarely") 3. (8) use, expend -- (use up, consume fully; "The legislature expended its time on school questions") 4. use -- (seek or achieve an end by using to one's advantage; "She uses her influential friends to get jobs"; "The president's wife used her good connections") 5. practice, apply, use -- (avail oneself to; "apply a principle"; "practice a religion"; "use care when going down the stairs"; "use your common sense"; "practice non-violent resistance") 6. use -- (habitually do something (use only in the past tense); "She used to call her mother every week but now she calls only occasionally"; "I used to get sick when I ate in that dining hall"; "They used to vacation in the Bahamas") --- WordNet end ---