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conferenceseries.com
Volume 8, Issue 2 (Suppl) Chem Sci J 2017
ISSN: 2150-3494 CSJ, an open access journal Euro Chemistry 2017
May 11-13, 2017
May 11-13, 2017 Barcelona, Spain
4th European Chemistry Congress
Chem Sci J 2017, 8:2(Suppl)
A new extraction procedure for Bisphenol A (BPA) in canned foods
Sharif H Arar and Mahmoud A Alawi
University of Jordan, Jordan
Anew extraction procedure for the mutagenic BPA in canned food was developed employing an aqueous basic solution of 0.25 M
K2CO3 and 0.10 M NaOH after spiking with BPA-d16 as internal standard. The BPA was next extracted into diethyl ether after
acidification to pH=4 and centrifugation. Acetylation at dry basic conditions after diethyl ether evaporation was carried out for 30
minutes at 110 0C. Detection of the acetylated BPA was carried out by GC-EI/MS in the SIM mode with pulsed split-less mode. The
method was applicable in terms of eliminating the use of solvents like acetonitrile and heptane for the extraction step, where long
evaporation times that extend to several hours may have been needed to evaporate acetonitrile. Also removing lipids and precipitating
most of the proteins at acidic conditions prior to diethyl ether extraction replacing heptane or hexane use. In addition acetylation
is conducted in the absence of water without a freeze-drying step. The method was linear over the range 1µg/L to 460 µg/L with
instrument detection limit (IDL) of 0.01 µg/L and a limit of quantitation (LOQ) of 0.034 µg/L. The method detection limit (MDL)
ranged from 0.3µg/Kg to 2.0 µg/Kg (wet weight) based on 10 g sample and recovery range from 85% to 94%. BPA concentrations in
tested canned foods from outlet stores ranged from < MDL to 57.5 µg/Kg which were below the specific limit of BPA migration in
food proposed by the EU and within the food safety and quality criteria.
Carrier Dynamics in Organolead Halide Perovskites
Shengye Jin
Chinese Academy of Sciences, China
Encyclopedia of BioanalyticalMethods for Bioavailability andBioequivalence Studies of PTwo-dimensional (2D) layeredperovskites
((A)2(CH3NH3)n−1MnX3n+1, where A is a large aliphatic or aromatic alkylammonium cation working as an insulating layer,
M is the metal cation, and X is the halide anion) have already emerged as an attractive material for applications in photovoltaics and
other optoelectronic devices. Recent reports have demonstrated that the 2D layered perovskite films actually comprised multiple
perovskite phases (with various n values from 1, 2, 3 and 4 to near ), even though the films were intended to be prepared as a
single-phase. This hybrid feature seems to be ineluctable in fabricating 2D films. However, two important questions remain yet-to-be-
answered: first, how the different perovskite phases align in the hybrid films; second, whether the band alignment between different
phases induces energy funneling or instead charge separation. The latter is especially important because it dictates the application
of these hybrid 2D perovskite films: energy funneling is useful for lightemitting applications, whereas charge separation would be
more beneficial for light conversion or detection. Herein, we studied the charge carrier dynamics in 2Dmulti-layered perovskite films
using ultrafast transient absorption and photoluminescence spectroscopy. Researchers found that multiple perovskite phases inside
2D layered perovskite film (including n = 2, 3, 4 and ≈ ∞) naturally align in the order of n along the direction perpendicular to the
substrate. Driven by the band alignment between 2D perovskites phases, researchers observed consecutive photoinduced electron
transfer from small-n to large-n phases and hole transfer in the opposite direction on hundreds of picoseconds inside the 2D film
of ~358 nm thickness. This internal charge transfer efficiently separates electrons and holes to the upper and bottom surfaces of the
films, which is a unique property beneficial for applications in photovoltaics and other optoelectronics devices.