Navigation Links
Determination of N-nitrosamines in Baby Bottle Rubber Teats by Liquid Chromatography-Atmospheric Pressure Chemical Ionization Mass Spectrometry

trosoamine standard mixture were prepared. Calibration curves without the use of internal standards produced correlation coefficients for all standards > 0.998. Figure 2 shows the calibration curve for NMEA. Samples were obtained in methanol after extraction from the rubber teats. A 100 ppb spike of NDEA was added to each sample prior to extraction. Representative samples from the relatively clean synthetic polymer formulation (Figure 3) and the more contaminated natural rubber formulation (Figure 4) are shown below. Table 2 provides the nitrosamine concentrations observed for each of the polymer formulations.

Conclusions

A method for analyzing nitrosamines in baby bottle rubber teats is presented. This method offers an improvement over the current AOAC method in that LC/MS/MS offers more specificity without sacrificing sensitivity. The data from the analysis of the six samples indicates that the naturalrubber formulation had a higher concentration of NDMA and NMOR then either of the other two formulations. Also, it can be observed that the synthetic polymer formulation had on average less total nitrosamines then the silicone or the natural rubber samples. The calibration data for all samples indicates linearity down to 1 ppb. Replicate analysis of the NDEA spiked samples indicates that there are inconsistant recoveries of this nitrosamine. This is probably due to the formation of artifact nitrosamines during the extraction process.


'"/>

Source:


Page: All 1 2 3

Related biology technology :

1. Structural Determination of Flavonoids Using MSn
2. Total Cellular Protein Determination Using the DC Protein Assay
3. Simultaneous Determination of Residues of Approximately 100 Pesticides and Metabolites in Fruit and Vegetables by LC/MS/MS
4. Determination of Polar Organophosphorus Pesticides in Aqueous Samples by Direct Injection Using HPLC/MS/MS
5. Determination of the Chloramphenicol residues in milk and milk products using LC/MS/MS
6. A Microtiter-based Assay for the Determination of ID50s of b-lactamase Inhibitors Employing Reporter Substrates Detected at UV or Visible Wavelengths (MaxLine Application Note #20)
7. Determination of Acepromazine and its Major Metabolite in Equine Serum by LC-MS/MS using the Finnigan LCQ Deca XP Plus Ion Trap Mass Spectrometer
8. Chemical Stability of the Brinkmann Bottletop Dispenser and the Brinkmann Bottletop Buret
9. Ergonomics and Liquid Handling How can BrinkmannTM Help ?
10. Sciclone ALH 3000 Liquid Handler: Functional Characterization of the High Volume Head - Part 1: Plate-to-Plate Precision Testing
11. Precision Testing for the Sciclone Advanced Liquid Handler Z8 Option
Post Your Comments:
(Date:11/26/2014)... IL (PRWEB) November 26, 2014 In ... is giving customers a bevy of last-minute Thanksgiving savings. ... codes and offers across all product lines this holiday ... , Thanksgiving, Black Friday, and Cyber Monday are ... its' own thanks to both loyal customers and those ...
(Date:11/26/2014)... 2014 The ETC (Emerging Technology ... innovation centers, announced today that applications for AccelerateBaltimore™ ... 1st. “Do you have a big idea?,” asked ... to know about it. AccelerateBaltimore helps you and ... in just 13 weeks.” Interested game changers ...
(Date:11/26/2014)... Continuing its award-winning streak, Nerium International, the leader ... for outstanding creative achievement by its marketing and communication ... organization’s top honor, in the Branding category for its ... of this year. The event showcased top speakers and ... awarded a Gold MarCom Award in the Special Events ...
(Date:11/26/2014)... 2014 CURE™ magazine will ... December 5, 2014, in San Francisco prior to the ... event will honor clinicians, caregivers, and advocates who have ... (MPNs). , Special guest speaker Charles Esten, from ... journey at the reception. Over a decade ago, ...
Breaking Biology Technology:DNA Spectrum Offers Last Minute Thanksgiving Coupons 2DNA Spectrum Offers Last Minute Thanksgiving Coupons 3AccelerateBaltimore Applications to Close in 6 Days 2AccelerateBaltimore Applications to Close in 6 Days 3Nerium International™ Wins One Platinum, Two Gold MarCom Awards 2CURE Magazine and Incyte to Honor MPN Heroes 2CURE Magazine and Incyte to Honor MPN Heroes 3CURE Magazine and Incyte to Honor MPN Heroes 4
... Introduction , ... 1 O 2 , is of considerable interest in environmental applications, ... been directed towards understanding the biological effects of 1 O 2 ... a dye, oxygen, and light. <P,>An understanding of the mechanisms that produce ...
... , ... The brightly-colored coral reefs that make scuba-diving and snorkeling ... essential to the survival of many species of fish and underwater life. ... hide from the larger predators, but also some fish actually survive by ...
... Introduction , ... human hair can be quantified with fluorescence spectroscopy. This is of significant interest ... , , ... involved in hair-care products, we performed the following evaluation using fluorescence spectroscopy. Two ...
Cached Biology Technology:Singlet Oxygen measurement 2Fluorescent pigments in living coral 2Fluorescent pigments in living coral 3Assessing UV damage of hair 2
(Date:11/11/2014)... 2014  Forensicon, Inc., a Chicago ... announce the promotion of Yaniv Schiff from ... In Schiff,s new role as Director, he will lead ... forensics examiners and provide leadership within the company,s digital ... http://photos.prnewswire.com/prnh/20141110/157719 Schiff joined Forensicon in ...
(Date:11/7/2014)... , Nov. 7, 2014  In conjunction with the ... Police Departments, The Community Foundation of the Verdugos has ... DNA JUSTICE PROJECT," a $250,000 initiative to keep the ... phase. In its first six months of existence, the Lab ... evidence support for local law enforcement. "Because our ...
(Date:11/6/2014)... cancer deaths occur because of metastasis, yet progress ... been slow. , "It,s been particularly challenging to ... Gujral, research fellow in systems biology at Harvard ... detected until after they,ve already metastasized." , Gujral ... that should help researchers better understand how metastasis ...
Breaking Biology News(10 mins):Yaniv Schiff Promoted to Director of Digital Forensics at Forensicon, Inc. 2Community Foundation Of The Verdugos Unveils Campaign To Fund Glendale-Burbank DNA Justice Project 2Migration negation 2Migration negation 3
... Transposons are the Clark Kents of a genome. ... activity, these free-floating bits of genetic material have for ... of plants and animals, dramatically increasing a genome,s size. ... DNA was passive "junk" and knew little about it. ...
... 10, 2008) A study published in the current ... suggests that mature adipocytes - fat cells - could ... central nervous system disorders. , According to the study,s ... Medical Science, St. Mariana University School of Medicine, Kawasaki, ...
... Antioxidant-rich honey is a healthy alternative to chemical additives ... new University of Illinois study. "To capitalize on ... using honey in salad dressings," said Nicki Engeseth, a ... found that the antioxidants in honey protected the quality ...
Cached Biology News:New research shows how gene function drives natural selection in important class of genetic elements 2New research shows how gene function drives natural selection in important class of genetic elements 3Transplanted fat cells restore function after spinal cord injury 2Honey adds health benefits, is natural preservative and sweetener in salad dressings 2
Rabbit polyclonal to IL23 P19 ( Abpromise for all tested applications). Antigen: Synthetic 16 amino acid peptide from near the amino terminus of human IL23 P19 Entrez Gene ID: 51561 Swiss...
Complement C1q subcomponent subunit C precursor. [Source:Uniprot/SWISSPROT;Acc:P02747] Antigen: Recombinant Protein Epitope Signature Tag (PrEST)....
Monoclonal Mouse Anti-Human Cytokeratin 16 (48 kD)...
Mouse monoclonal [CRC64] to Integrin alpha 2b + beta 3 ( Abpromise for all tested applications). Antigen: Human platelets Entrez Gene ID: 23295 Swiss Protein ID: P05106...
Biology Products: