13 research outputs found
A survey of bisphenol A and other bisphenol analogues in foodstuffs from nine cities in China
<div><p>Bisphenol A (BPA) is a high-production-volume chemical that is widely used in polycarbonate plastics and epoxy food-can coatings. Following several studies that have reported adverse effects of BPA over the past decade, other bisphenol analogues, such as bisphenol F (BPF), bisphenol S (BPS), bisphenol AF (BPAF), and bisphenol B (BPB), have been gradually developed as substitutes for BPA in several applications. Nevertheless, few studies have reported on the occurrence of compounds other than BPA in foodstuffs. In this study, 289 food samples (13 categories: cereals and cereal products, meat and meat products, fish and seafood, eggs, milk and milk products, bean products, fruits, vegetables, cookies/snacks, beverages, cooking oils, condiments, and others), collected from nine cities in China, were analysed for eight bisphenol analogues using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). BPA and BPF were found widely in foodstuffs at concentrations ranging from below the limit of quantitation (LOQ) to 299 ng g<sup>â1</sup> (mean = 4.94 ng g<sup>â1</sup>) and from below the LOQ to 623 ng g<sup>â1</sup> (mean = 2.50 ng g<sup>â1</sup>), fresh weight, respectively. The highest total concentrations of bisphenols (âBPs: sum of eight bisphenols) were found in the category of vegetables that included canned products (mean = 27.0 ng g<sup>â1</sup>), followed by fish and seafood (16.5 ng g<sup>â1</sup>) and beverages (15.6 ng g<sup>â1</sup>). âBP concentrations (mean = 2â3 ng g<sup>â1</sup>) in milk and milk products, cooking oils, and eggs were low. Food samples sold in metallic cans contained higher mean âBP concentrations (56.9 ng g<sup>â1</sup>) in comparison with those packaged in glass (0.43 ng g<sup>â1</sup>), paper (11.9 ng g<sup>â1</sup>), or plastic (6.40 ng g<sup>â1</sup>). The daily dietary intakes of bisphenols were estimated, based on the mean concentrations measured and daily consumption rates of foods, to be 646 and 664 ng kg<sup>â1</sup> bw day<sup>â1</sup> for men and women, respectively.</p></div
Widespread Occurrence of Benzophenone-Type UV Light Filters in Personal Care Products from China and the United States: An Assessment of Human Exposure
Benzophenone-3
(BP-3) is a sunscreen agent used in a variety of personal care products
(PCPs) for the protection of human skin and hair from damage by ultraviolet
(UV) radiation. Concerns have been raised over exposure of humans
to BP-3, owing to the estrogenic potential of this compound. Nevertheless,
the levels and profiles of BP-3 in PCPs and sources of exposure of
humans to this estrogenic compound are not well-known. In this study,
concentrations of BP-3 were determined in seven categories of 231
PCPs collected from several cities in China (<i>n</i> =
117) and the United States (U.S.) (<i>n</i> = 114), using
high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS).
BP-3 was found in the majority (81%) of the samples analyzed, at concentrations
as high as 0.148%. The highest BP-3 concentrations (geometric mean
[GM]: 548; median: 530 ng/g) were found in skin lotions (including
sunscreen lotions), followed by makeup products (284; 221 ng/g). PCPs
collected from the U.S. contained higher concentrations of BP-3 than
those collected from China. On the basis of the concentrations measured
and daily usage rates of PCPs, we estimated the daily intake of BP-3
through dermal absorption from the use of PCPs. The GM and 95th percentile
exposure doses to BP-3 were 0.978 and 25.5 Îźg/day, respectively,
for adult women in China, which were 2 orders of magnitude lower than
those found for adult women in the U.S. (24.4 and 5160 Îźg/day).
Skin lotions and face creams contributed to the preponderance of daily
BP-3 exposures (>80%)
Concentrations and Profiles of Bisphenol A and Other Bisphenol Analogues in Foodstuffs from the United States and Their Implications for Human Exposure
As the concern over the safety of
bisphenol A (BPA) continues to
grow, this compound is gradually being replaced, in industrial applications,
with compounds such as bisphenol F (BPF) and bisphenol S (BPS). Occurrence
of bisphenols, including BPA and BPS, has been reported in paper products
and in environmental matrices. Information on the occurrence of bisphenols,
other than BPA, in foodstuffs, however, is scarce. In this study,
several bisphenol analogues, including BPA, BPF, and BPS, were analyzed
in foodstuffs (<i>N</i> = 267) collected from Albany, NY,
USA, using high-performance liquid chromatographyâtandem mass
spectrometry (HPLC-MS/MS). Foodstuffs were divided into nine categories
of beverages, dairy products, fats and oils, fish and seafood, cereals,
meat and meat products, fruits, vegetables, and âothersâ.
Bisphenols were found in the majority (75%) of the food samples, and
the total concentrations of bisphenols (ÎŁBPs: sum of eight bisphenols)
were in the range of below the limit of quantification (LOQ) to 1130
ng/g fresh weight, with an overall mean value of 4.38 ng/g. The highest
overall mean concentration of ÎŁBPs was found in the âothersâ
category, which included condiments (preserved, ready-to-serve foods).
A sample of mustard (dressing) and ginger, placed in the category
of vegetables, contained the highest concentrations of 1130 ng/g for
bisphenol F (BPF) and 237 ng/g for bisphenol P (BPP). Concentrations
of BPs in beverages (mean = 0.341 ng/g) and fruits (0.698 ng/g) were
low. The predominant bisphenol analogues found in foodstuffs were
BPA and BPF, which accounted for 42 and 17% of the total BP concentrations,
respectively. Canned foods contained higher concentrations of individual
and total bisphenols in comparison to foods sold in glass, paper,
or plastic containers. On the basis of measured concentrations and
daily ingestion rates of foods, the daily dietary intakes of bisphenols
(calculated from the mean concentration) were estimated to be 243,
142, 117, 63.6, and 58.6 ng/kg body weight (bw)/day for toddlers,
infants, children, teenagers, and adults, respectively
Determination of Free and Conjugated Forms of Bisphenol A in Human Urine and Serum by Liquid ChromatographyâTandem Mass Spectrometry
Exposure of humans to bisphenol A (BPA), a widely used
industrial
chemical, is well-known. In humans and animals, conjugation of BPA
molecule with glucuronide or sulfate is considered as a mechanism
for detoxification. Nevertheless, very few studies have directly measured
free, conjugated (e.g., glucuronidated), and substituted (e.g., chlorinated)
forms of BPA in human specimens. In this study, free, conjugated (BPA
glucuronide or BPAG and BPA disulfate or BPADS), and substituted (chlorinated
BPA; mono- [BPAMC], di-[BPADC], and trichloride [BPATrC]) forms of
BPA were determined in human urine and serum samples, using solid-phase
extraction (SPE) and liquid chromatographyâtandem mass spectrometry
(LCâMS/MS) techniques. The instrumental calibration for each
of the target compounds ranged from 0.01 to 100 ng/mL and showed excellent
linearity (<i>r</i> > 0.99). The limits of quantification
(LOQs) were 0.01 ng/mL for free BPA and 0.05 ng/mL for the conjugated
and substituted BPA. Respective recoveries of the six target compounds
spiked into water blanks and sample matrices (urine and serum), and
passed through the entire analytical procedure, were 96 Âą 14%
and 105 Âą 18% (mean Âą SD) for urine samples and 87 Âą
8% and 80 Âą 13% for serum samples. The optimal recoveries of
BPAG and BPADS in the analytical procedure indicted that no deconjugation
occurred during the SPE procedure. The method was applied to measure
six target chemicals in urine and serum samples collected from volunteers
in Albany, New York. BPA and its derivatives were found in urine samples
at concentrations ranging from < LOQ to a few tens of ng/mL. In
serum, free and conjugated BPA were detected at sub ng/mL concentrations,
whereas BPA chlorides were not detected. The urine and serum samples
were also analyzed by enzymatic deconjugation and liquidâliquid
extraction (LLE) for the determination of total BPA, and the results
were compared with those measured by the SPE method. To our knowledge,
this is the first report on the occurrence of BPAG and BPADS in human
serum
A Review of Environmental Occurrence, Fate, Exposure, and Toxicity of Benzothiazoles
Benzothiazole and its derivatives
(BTs) are high production volume
chemicals that have been used for several decades in a large number
of industrial and consumer products, including vulcanization accelerators,
corrosion inhibitors, fungicides, herbicides, algicides, and ultraviolet
(UV) light stabilizers. Several benzothiazole derivatives are used
commercially, and widespread use of these chemicals has led to ubiquitous
occurrence in diverse environmental compartments. BTs have been reported
to be dermal sensitizers, respiratory tract irritants, endocrine disruptors,
carcinogens, and genotoxicants. This article reviews occurrence and
fate of a select group of BTs in the environment, as well as human
exposure and toxicity. BTs have frequently been found in various environmental
matrices at concentrations ranging from sub-ng/L (surface water) to
several tens of Îźg/g (indoor dust). The use of BTs in a number
of consumer products, especially in rubber products, has resulted
in widespread human exposure. BTs undergo chemical, biological, and
photolytic degradation in the environment, creating several transformation
products. Of these, 2-thiocyanomethylthio-benzothiazole (2-SCNMeS-BTH)
has been shown to be the most toxic. Epidemiological studies have
shown excess risks of cancers, including bladder cancer, lung cancer,
and leukemia, among rubber factory workers, particularly those exposed
to 2-mercapto-benzothiazole (2-SH-BTH). Human exposure to BTs continues
to be a concern
Exposure to MEHP during Pregnancy and Lactation Impairs Offspring Growth and Development by Disrupting Thyroid Hormone Homeostasis
Mono(2-ethylhexyl)
phthalate (MEHP), as a highly toxic and biologically
active phthalate metabolite, poses considerable risks to the environment
and humans. Despite the existence of in vitro studies,
there is a lack of in vivo experiments assessing
its toxicity, particularly thyroid toxicity. Herein, we investigated
the thyroid-disrupting effects of MEHP and the effects on growth and
development of maternal exposure to MEHP during pregnancy and lactation
on the offspring modeled by SD rats. We found that thyroid hormone
(TH) homeostasis was disrupted in the offspring, showing a decrease
in total TH levels, combined with an increase in free TH levels. Nonhomeostasis
ultimately leads to weight loss in female offspring, longer anogenital
distance in male offspring, prolonged eye-opening times, and fewer
offspring. Our findings indicate that maternal exposure to MEHP during
pregnancy and lactation indirectly influences the synthesis, transport,
transformation, and metabolism of THs in the offspring. Meanwhile,
MEHP disrupted the morphology and ultrastructure of the thyroid gland,
leading to TH disruption. This hormonal disruption might ultimately
affect the growth and development of the offspring. This study provides
a novel perspective on the thyroid toxicity mechanisms of phthalate
metabolites, emphasizing the health risks to newborns indirectly exposed
to phthalates and their metabolites
Bisphenol Analogues in Sediments from Industrialized Areas in the United States, Japan, and Korea: Spatial and Temporal Distributions
Bisphenol analogues are used in the production of polycarbonate
plastics and epoxy resins. Despite the widespread use of bisphenols,
few studies have reported the occurrence of compounds other than bisphenol
A (BPA) in sediment. In this study, concentrations and profiles of
eight bisphenol analogues were determined using high-performance liquid
chromatography-tandem mass spectrometry (HPLC-MS/MS) in sediments
collected from several industrialized areas in the United States (U.S.),
Japan, and Korea. The total concentrations of bisphenols (ÎŁBPs;
sum of eight bisphenols) in sediment ranged from below the limit of
quantitation (LOQ) to 25â300 ng/g dry weight (dw), with a mean
value of 201 ng/g dw. Sediment samples from Lake Shihwa, Korea, contained
the highest concentrations of both individual and total bisphenols.
Among individual bisphenols, BPA and bisphenol F (BPF) were the predominant
compounds, accounting for 64% and 30% of the total bisphenol concentrations
in sediment. We also examined vertical profiles of concentrations
of bisphenol analogues in sediment cores from the U.S. and Japan.
Sediment cores from the U.S. showed a gradual decline in the concentrations
of bisphenols as compared to the past decade. BPA concentrations were
found to decline in a sediment core from Tokyo Bay, but bisphenol
S (BPS) was more frequently detected in core sections that represent
the most recent decade, which is consistent with the replacement of
BPA with BPS in some applications since 2001 in Japan
Occurrence of Eight Bisphenol Analogues in Indoor Dust from the United States and Several Asian Countries: Implications for Human Exposure
Bisphenol A has been reported to be a ubiquitous contaminant
in
indoor dust, and human exposure to this compound is well documented.
Information on the occurrence of and human exposure to other bisphenol
analogues is limited. In this study, eight bisphenol analogues, namely
2,2-bisÂ(4-hydroxyphenyl)Âpropane (BPA), 4,4â˛-(hexafluoroisopropylidene)Âdiphenol
(BPAF), 4,4â˛-(1-phenylethylidene)Âbisphenol (BPAP), 2,2-bisÂ(4-hydroxyphenyl)Âbutane
(BPB), 4,4â˛-dihydroxydiphenylmethane (BPF), 4,4â˛-(1,4-phenylenediisopropylidene)Âbisphenol
(BPP), 4,4â˛- sulfonyldiphenol (BPS), and 4,4â˛-cyclohexylidenebisphenol
(BPZ), were determined in indoor dust samples (<i>n</i> =
156) collected from the United States (U.S.), China, Japan, and Korea.
Samples were extracted by solidâliquid extraction, purified
by automated solid phase extraction methods, and determined by liquid
chromatography-tandem mass spectrometry (LC-MS/MS). The total concentrations
of bisphenols (âBPs; sum of eight bisphenols) in dust were
in the range of 0.026â111 Îźg/g (geometric mean: 2.29
Îźg/g). BPA, BPS, and BPF were the three major bisphenols, accounting
for >98% of the total concentrations. Other bisphenol analogues
were
rare or not detected, with the exception of BPAF, which was found
in 76% of the 41 samples collected in Korea (geometric mean: 0.0039
Îźg/g). The indoor dust samples from Korea contained the highest
concentrations of both individual and total bisphenols. BPA concentrations
in dust were compared among three microenvironments (house, office,
and laboratory). The estimated median daily intake (EDI) of âBPs
through dust ingestion in the U.S., China, Japan, and Korea was 12.6,
4.61, 15.8, and 18.6 ng/kg body weight (bw)/day, respectively, for
toddlers and 1.72, 0.78, 2.65, and 3.13 ng/kg bw/day, respectively,
for adults. This is the first report on the occurrence of bisphenols,
other than BPA, in indoor dust
Assessing and Reducing the Toxicity of 3D-Printed Parts
3D
printing is gaining popularity by providing a tool for fast,
cost-effective, and highly customizable fabrication. However, little
is known about the toxicity of 3D-printed objects. In this work, we
assess the toxicity of printed parts from two main classes of commercial
3D printers, fused deposition modeling and stereolithography. We assessed
the toxicity of these 3D-printed parts using zebrafish (<i>Danio
rerio</i>), a widely used model organism in aquatic toxicology.
Zebrafish embryos were exposed to 3D-printed parts and monitored for
rates of survival, hatching, and developmental abnormalities. We found
that parts from both types of printers were measurably toxic to zebrafish
embryos, with STL-printed parts significantly more toxic than FDM-printed
parts. We also developed a simple post-printing treatment (exposure
to ultraviolet light) that largely mitigates the toxicity of the STL-printed
parts. Our results call attention to the need for strategies for the
safe disposal of 3D-printed parts and printer waste materials
Occurrence and Human Exposure of <i>p</i>âHydroxybenzoic Acid Esters (Parabens), Bisphenol A Diglycidyl Ether (BADGE), and Their Hydrolysis Products in Indoor Dust from the United States and Three East Asian Countries
<i>p</i>-Hydroxybenzoic acid esters (parabens)
and bisphenol
A diglycidyl ether (BADGE) are widely present in personal care products,
food packages, and material coatings. Nevertheless, little is known
about the occurrence of these compounds in indoor dust. In this study,
we collected 158 indoor dust samples from the U.S., China, Korea,
and Japan and determined the concentrations of 11 target chemicals,
viz., six parabens and their common hydrolysis product, 4-hydroxybenzoic
acid (4-HB), as well as BADGE and its three hydrolysis products (BADGE¡H<sub>2</sub>O, BADGE¡2H<sub>2</sub>O, and BADGE¡HCl¡H<sub>2</sub>O). All of the target compounds were found in dust samples
from four countries. Concentrations of sum of six parabens in dust
were on the order of several hundred to several thousands of nanogram
per gram. Geometric mean concentrations of BADGEs in dust ranged from
1300 to 2890 ng/g among four countries. Methyl paraben (MeP), propyl
paraben (PrP), BADGE¡2H<sub>2</sub>O, and BADGE¡HCl¡H<sub>2</sub>O were the predominant compounds found in dust samples. This
is the first report of BADGE and its hydrolysis products (BADGEs)
in indoor dust samples and of parabens in indoor dust from Asian countries.
On the basis of the measured concentrations of target chemicals, we
estimated the daily intake (EDI) via dust ingestion. The EDIs of parabens
via dust ingestion were 5â10 times higher in children than
in adults. Among the four countries studied, the EDIs of parabens
(5.4 ng/kg-bw/day) and BADGEs (6.5 ng/kg-bw/day) through dust ingestion
were the highest for children in Korea and Japan