testing for bpa and other edcs
DESCRIPTION
Testing for Bisphenol A and other Endocrine Disruptor Chemicals Lee Blum, Ph.D.TRANSCRIPT
Lee Blum, Ph.D.
Testing for Bisphenol A and other Endocrine Disruptor
Chemicals
Bisphenol A• Why NMS Labs interested in testing for
Bisphenol A:– Growing public concern
• National Toxicology Program - 2008 “Some concern”• Endocrine Society Scientific Statement
– 2009 Recognition of chemicals that interfere with the biosynthesis, metabolism or activity of hormones.
• FDA - 2010 “Some concern”– Recognition of widespread human exposures
• One of the world's highest production volume chemicals, with over 2.2 million tonnes (6.4 billion pounds) produced annually. (ScienceDaily Jan. 13, 2010)
• Releases to the environment exceed 1 million pounds per year. (U.S. EPA)
• Detectable in more than 92% of the U.S. population. (Calafat, et al, 2008)
Bisphenol A
Population Median (25th – 95th percentile)
All 2.7 ng/mL (1.3 – 15.9)
6 – 11 years 3.7 ng/mL (1.7 – 16.0)
12 – 19 years 4.2 ng/mL (1.9 – 16.5)
20 – 59 years 2.7 ng/mL (1.2 – 15.5)
60 + years 1.9 ng/mL (0.8 – 13.3)
Females 2.4 ng/mL (1.2 – 15.7)
Males 3.2 ng/mL (1.4 – 16.0)
• CDC NHANES Study 2003-2004 (Calafat, et al., 2008) – Urinary Total Bisphenol A in U.S. population (n = 2517)
Bisphenol A
NTP – The Study & The Results
Bisphenol A – It’s Everywhere
Bisphenol A - Exposures• Air, dust and water• Primarily through diet
– Majority in food and beverages• Epoxy resins - Internal container coatings• Polycarbonate plastic – bottles (baby and water),
food containers and tableware
• Others– Dental sealants or composites– Processing of PVC (constituent of some PVC
plastics)– Thermal paper– Recycling of thermal paper – Epoxy based paints and lacquers – Workers involved in the manufacture of BPA and
BPA containing products
Bisphenol A - Toxicokinetics• Absorption through ingestion,
inhalation and skin.• Metabolism - an efficient first-pass
metabolism in the liver after oral administration and is rapidly converted to BPA-glucuronide.
• Virtually completely eliminated within 24 hours following acute exposures.– Study by Stahlhut et al. (2009) found that urine
BPA levels of individuals who fasted for several hours were not as low as expected.
Bisphenol A
• Purposes of testing:– Support of Medical Research
•Provide resources for bioanalytical testing
– Support of Environmental and Occupational Medicine •Clinical evaluations•Environmental and workplace
monitoring
BPA – Procedure in Urine• Analysis in urine
– Sample volume is 1.0 mL of urine– Internal standard D16-BPA– Calibrators are prepared with each batch of
samples• 0.25 to 10.0 ng/mL
– Hydrolysis– Liquid/liquid extraction– Derivatization with PFPA
(pentafluoropropionic anhydride)– Analysis by GC – EI Mass spectrometry with
SIM mode of analysis• Mass ions monitored:
– BPA 505 m/z (Quant); 520 m/z; 506 m/z– D16-BPA 516 m/z (Quant); 534 m/z; 517 m/z
BPA - Instrumentation
Hewlett Packard/Agilent 5973 MSD
BPA – Collection Concerns
• Specimen Collection – Urine samples are collected in standard
urine collection cups and refrigerated as soon as possible. Samples should be transferred to polypropylene vials within 4 hours of collection and frozen. Store the specimens frozen (-20oC) and ship on dry ice. Ref: Laboratory Procedure Manual for Bisphenol A [and other environmental phenols], Organic Analytical Toxicology Branch, Division of Laboratory Sciences, National Center for Environmental Health, CDC, Atlanta, GA May 25, 2005.
BPA – Linearity in Urine
Observed Concentrations (ng/mL)
Target Value Day 1 Day 2 Day 3
10.0 ng/mL 10.6 10.4 10.2
5.0 ng/mL 4.90 5.02 4.99
2.5 ng/mL 2.44 2.43 2.50
1.0 ng/mL 0.98 0.98 0.98
0.25 ng/mL 0.25 0.25 0.25
BPA – Linearity in Urine
BPA Linearity - Urine
y = 1.0395x - 0.0907
R2 = 0.999
0
2
4
6
8
10
12
0 2 4 6 8 10 12
Target Concentration (ng/mL)
Ob
serv
ed C
on
cen
trat
ion
(n
g/m
L)
BPA - Within Day Precision in Urine
N = 5 x 3 Days 0.25 ng/mL 0.5 ng/mL 7.5 ng/mLDay 1 Mean 0.30 ± 0.015 0.44 ± 0.01 6.64 ± 0.1
%CV 5.83% 1.26% 0.82%
% Accuracy 104% 87.2% 88.5%
Day 2 Mean 0.25 ± 0.026 0.41 ± 0.008 6.77 ± 0.1
%CV 10.4% 1.99% 1.69%
% Accuracy 101% 82% 90.3%
Day 3 Mean 0.23 ± 0.015 0.44 ± 0.02 6.38 ± 0.5
%CV 6.48% 3.59% 7.24%
% Accuracy 93.6% 88.0% 85.1%
BPA - Between Day Precision in Urine
N = 5 x 3 Days 0.25 ng/mL 0.5 ng/mL 7.5 ng/mL
Mean 0.25 ± 0.02 0.43 ± 0.02 6.6 ± 0.30
%CV 8.91% 3.87% 4.63%
% Accuracy 100% 86.0% 87.9%
UrineSample
Endogenous(ng/mL)
Spiked(ng/mL)
Target(ng/mL)
Measured(ng/mL) Deviation from Target
1 0.15 1.0 1.15 1.12 -2.61%
2 1.75 2.5 4.25 4.05 -4.71%
3 2.61 5.0 7.61 6.87 -9.72%
4 0.41 10.0 10.4 9.26 -11.0%
5 3.89 15.0 18.9 19.0 0.53%
6 0.31 0.25 0.56 0.54 -3.57%
7 1.78 1.0 2.78 2.69 -3.24%
8 0.47 2.5 2.97 2.81 -5.39%
9 1.30 5.0 6.30 6.07 -3.65%
10 0.16 1.0 1.16 1.04 -10.3%
11 0.24 2.5 2.74 2.62 -4.38%
12 4.82 5.0 9.82 9.06 -7.74%
13 0.90 0.25 1.15 1.08 -6.09%
14 0.57 1.0 1.57 1.50 -4.46%
15 0.57 2.5 3.07 2.92 -4.89%
16 1.78 5.0 6.78 6.63 -2.21%
17 2.70 0.25 2.95 3.01 2.03%
18 4.28 1.0 5.28 5.26 -0.38%
19 1.08 2.5 3.58 3.06 -14.5%
Mean Endogenous 1.57 ± 1.46 ng/mL Mean Bias -5.07 ± 4.15%
BPA – Storage Stability in Urine
BPA Stability in Urine
0
1
2
3
4
5
6
7
8
Day 0 Day 1 Day 2 Day 7 Day 14 Day 30
Days in Storage
BP
A C
on
cen
trat
ion
(n
g/m
L)
Room Temp
BPA – Storage Stability in Urine
BPA Stability in Urine
0
1
2
3
4
5
6
7
8
Day 0 Day 1 Day 2 Day 7 Day 14 Day 30
Days in Storage
BP
A C
on
cen
trat
ion
(n
g/m
L)
Room Temp
Refrig Temp 3oC
BPA – Storage Stability in Urine
BPA Stability in Urine
0
1
2
3
4
5
6
7
8
Day 0 Day 1 Day 2 Day 7 Day 14 Day 30
Days in Storage
BP
A C
on
cen
trat
ion
(n
g/m
L)
Room Temp
Refrig Temp 3oC
Frozen Temp -10oC
BPA – Patient Urine Samples
Samples Tested 36
Median 3.2 ng/mL
Range <0.25 to >10 ng/mL
BPA – 0.25 ng/mL in Urine
BPA – Typical Urine Sample
BPA – Procedure in Blood/Serum/Plasma• Analysis in Blood/Serum/Plasma
– Sample volume is 1.0 mL – Internal standard D16-BPA– Calibrators are prepared with each batch
of samples• 0.25 to 10.0 ng/mL
– Solid Phase Extraction (SPE)– Derivatization with PFPA
(pentafluoropropionic anhydride)– Analysis by GC – EI Mass spectrometry with
SIM mode of analysis• Mass ions monitored:
– BPA 505 m/z (Quant); 520 m/z; 506 m/z– D16-BPA 516 m/z (Quant); 534 m/z; 517 m/z
BPA – Linearity in Serum
BPA – Linearity in Blood
BPA - Within Day Precision in Serum
N = 5 0.25 ng/mL 0.75 ng/mL 7.5 ng/mL
Mean 0.21 ± 0.01 0.80 ± 0.06 7.61 ± 0.26
%CV 5.12% 6.94% 3.42%
% Accuracy 85.6% 106% 102%
BPA – Spiked Plasma Samples
PlasmaSample
Endogenous(ng/mL)
Spiked(ng/mL)
Target(ng/mL)
Measured(ng/mL) Deviation from Target
1 0.22 0.25 0.47 0.47 0.00%
2 0.22 2.50 2.72 2.63 -3.31%
3 0.67 0.50 1.17 1.15 -1.71%
4 0.67 5.00 5.67 5.48 -3.35%
5 0.26 1.00 1.26 1.30 3.17%
6 0.26 10.0 10.3 10.0 -2.53%
7 0.11 0.75 0.86 0.92 6.98%
8 0.11 7.50 7.61 7.52 -1.18%
9 2.10 3.00 5.10 5.31 4.12%
10 2.10 9.00 11.1 11.3 1.62%
Mean Endogenous 0.67 ± 0.83 ng/mL Mean Bias 0.38 ± 3.49%
BPA – Spiked Blood Samples Blood
SampleEndogenous
(ng/mL)Spiked(ng/mL)
Target(ng/mL)
Measured(ng/mL) Deviation from Target
NaF 0.08 0.25 0.33 0.36 9.09%
NaF 0.08 2.50 2.58 2.86 10.8%
K Oxalate 0.17 0.50 0.67 0.70 4.48%
K Oxalate 0.17 5.00 5.17 6.06 17.2%
Na EDTA 0.18 1.00 1.18 1.32 11.9%
Na EDTA 0.18 10.0 10.2 12.2 19.4%
K EDTA 0.12 0.75 0.87 0.83 -4.60%
K EDTA 0.12 7.50 7.62 9.00 18.1%
Na Heparin 0.22 3.00 3.22 3.30 2.48%
Na Heparin 0.22 9.00 9.22 10.1 9.54%
Mean Endogenous 0.15 ± 0.05 ng/mL Mean Bias 9.85 ± 7.54%
BPA – Storage Stability in Serum
BPA – 0.25 ng/mL in Serum
BPA – 0.75 ng/mL in Blood
Endocrine Disrupting Chemicals
• Phthalate Metabolites in Urine– Mono-n-butyl phthalate– Mono-ethylhexylphthalate– Mono-(2-ethyl-5-hydroxyhexyl) phthalate– Mono-(2-ethyl-5-oxohexyl) phthalate
• Chlorinated Hydrocarbons in Serum/Plasma/Blood and Adipose Tissue– e.g. DDT, DDE and DDD; and others
• Herbicides in Serum/Plasma/Blood and Urine– e.g. Atrazine and others
• Metals in Serum/Plasma/Blood and Urine– e.g. Arsenic, Cadmium, Lead, Manganese,
Mercury, Zinc and others
Hormone Testing
• Estrogen in Serum/Plasma– Estrone (E1)– Estradiol (E2)– Estriol (E3)
• Testosterone in Serum/Plasma– Testosterone, Free, Total, and Bioavailable– Dihydrotestosterone (DHT)
• Thyroid Hormones in Serum/Plasma– T3 (Triiodothyronine), Free– T4 (Thyroxine), Free
• Coming Soon an Expanded Thyroid Panel
[email protected]: 1-800-522-6671
Lee Blum, Ph.D.