Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: July 22, 2024
Pesticides
and
pharmaceuticals
enter
aquatic
ecosystems
as
complex
mixtures.
Various
processes
govern
their
dissipation
effect
on
the
sediment
surface
waters.
These
micropollutants
often
show
persistence
can
adversely
affect
microorganisms
even
at
low
concentrations.
We
investigated
effects
procaryotic
communities
of
metformin
(antidiabetic
drug),
metolachlor
(agricultural
herbicide),
terbutryn
(herbicide
in
building
materials).
contaminants
were
introduced
individually
or
a
mixture
(17.6
µM
per
micropollutant)
into
laboratory
microcosms
mimicking
sediment-water
interface.
Metformin
completely
dissipated
within
70
days,
whereas
persisted.
Dissipation
did
not
differ
whether
part
mixture.
Sequence
analysis
16S
rRNA
gene
amplicons
evidenced
distinct
responses
prokaryotic
both
water.
Prokaryotic
community
variations
mainly
driven
by
matrix
composition
incubation
time.
Micropollutant
exposure
played
secondary
but
influential
role,
with
pronounced
recalcitrant
micropollutant
Antagonistic
synergistic
non-additive
identified
for
specific
taxa
across
taxonomic
levels
response
to
This
study
underscores
importance
considering
diversity
interactions
between
micropollutants,
communities,
respective
environments
when
examining
interfaces
affected
multiple
contaminants.
Environmental Pollution,
Journal Year:
2023,
Volume and Issue:
327, P. 121626 - 121626
Published: April 11, 2023
The
presence
and
distribution
of
emerging
organic
contaminants
(EOCs)
in
freshwater
environments
is
a
key
issue
India
globally,
particularly
due
to
ecotoxicological
potential
antimicrobial
resistance
concerns.
Here
we
have
investigated
the
composition
spatial
EOCs
surface
water
along
∼500
km
segment
iconic
River
Ganges
(Ganga)
tributaries
middle
Gangetic
Plain
Northern
India.
Using
broad
screening
approach,
11
samples,
identified
51
EOCs,
comprising
pharmaceuticals,
agrochemicals,
lifestyle
industrial
chemicals.
Whilst
majority
detected
were
mixture
pharmaceuticals
chemicals
(and
sucralose)
occurred
at
highest
concentrations.
Ten
are
priority
compounds
(e.g.
sulfamethoxazole,
diuron,
atrazine,
chlorpyrifos,
perfluorooctane
sulfonate
(PFOS),
perfluorobutane
sulfonate,
thiamethoxam,
imidacloprid,
clothianidin
diclofenac).
In
almost
50%
sulfamethoxazole
concentrations
exceeded
predicted
no-effect
(PNECs)
for
ecological
toxicity.
A
significant
downstream
reduction
was
observed
Ganga
between
Varanasi
(Uttar
Pradesh)
Begusarai
(Bihar),
likely
reflecting
dilution
effects
associated
with
three
major
tributaries,
all
considerably
lower
EOC
than
main
channel.
Sorption
and/or
redox
controls
some
clopidol),
as
well
relatively
high
degree
mixing
within
river.
We
discuss
environmental
relevance
persistence
several
parent
(notably
carbamazepine,
metribuzin
fipronil)
transformation
products.
Associations
other
hydrochemical
parameters
including
excitation
emission
matrix
(EEM)
fluorescence
indicated
positive,
significant,
compound-specific
correlations
tryptophan-,
fulvic-
humic-like
fluorescence.
This
study
expands
baseline
characterization
Indian
contributes
an
improved
understanding
sources
on
large
river
systems.
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(3), P. 1510 - 1519
Published: Jan. 9, 2023
Metformin
is
becoming
one
of
the
most
common
emerging
contaminants
in
surface
and
wastewater.
Its
biodegradation
generally
leads
to
accumulation
guanylurea
environment,
but
microorganisms
mechanisms
involved
this
process
remain
elusive.
Here,
Aminobacter
sp.
strain
NyZ550
was
isolated
characterized
for
its
ability
grow
on
metformin
as
a
sole
source
carbon,
nitrogen,
energy
under
oxic
conditions.
This
isolate
also
assimilated
variety
nitrogenous
compounds,
including
dimethylamine.
Hydrolysis
by
accompanied
stoichiometric
dead-end
product.
Based
ion
chromatography,
gas
chromatography–mass
spectrometry,
comparative
transcriptomic
analyses,
dimethylamine
identified
an
additional
hydrolytic
product
supporting
growth
strain.
Notably,
microbial
mixture
consisting
engineered
Pseudomonas
putida
PaW340
expressing
hydrolase
constructed
complete
elimination
persistent
guanylurea.
Overall,
our
results
not
only
provide
new
insights
into
pathway,
leading
commonly
observed
open
doors
degradation
pollutant
metformin.
Proceedings of the National Academy of Sciences,
Journal Year:
2024,
Volume and Issue:
121(10)
Published: Feb. 26, 2024
Metformin
is
the
first-line
treatment
for
type
II
diabetes
patients
and
a
pervasive
pollutant
with
more
than
180
million
kg
ingested
globally
entering
wastewater.
The
drug's
direct
mode
of
action
currently
unknown
but
linked
to
effects
on
gut
microbiomes
may
involve
specific
microbial
reactions
drug.
In
wastewater
plants,
metformin
known
be
transformed
by
microbes
guanylurea,
although
genes
encoding
this
metabolism
had
not
been
elucidated.
present
study,
we
revealed
function
two
responsible
decomposition
(
Frontiers in Bioengineering and Biotechnology,
Journal Year:
2022,
Volume and Issue:
10
Published: Dec. 16, 2022
Metformin
is
used
globally
to
treat
type
II
diabetes,
has
demonstrated
anti-ageing
and
COVID
mitigation
effects
a
major
anthropogenic
pollutant
be
bioremediated
by
wastewater
treatment
plants
(WWTPs).
not
adsorbed
well
activated
carbon
toxic
N-chloro
derivatives
can
form
in
chlorinated
water.
Most
earlier
studies
on
metformin
biodegradation
have
consortia
details
of
the
genomes,
relevant
genes,
metabolic
products,
potential
for
horizontal
gene
transfer
are
lacking.
Here,
two
metformin-biodegrading
bacteria
from
WWTP
were
isolated
their
characterized.
Aminobacter
sp.
MET
metabolized
stoichiometrically
guanylurea,
an
intermediate
known
accumulate
some
environments
including
WWTPs.
Pseudomonasmendocina
completely
utilized
all
nitrogen
atoms
growth.
Pseudomonas
mendocina
also
breakdown
products
sometimes
observed
WWTPs:
1-N-methylbiguanide,
biguanide,
guanidine.
The
genome
each
bacterium
was
obtained.
Genes
involved
transport
guanylurea
expressed
heterologously
shown
serve
as
antiporter
expel
guanidinium
compound.
A
novel
hydrolase
enzyme
identified
MET,
purified,
contained
one
plasmid
160
kb
90
kb,
respectively.
In
total,
these
significant
bioremediation
WWTPs
today.
Inorganic Chemistry,
Journal Year:
2023,
Volume and Issue:
62(21), P. 8249 - 8260
Published: May 18, 2023
In
this
work,
we
propose
a
modified
solid-state
approach
for
the
sustainable
preparation
of
SrWO4
bifunctional
catalyst
using
thymol-menthol-based
natural
deep
eutectic
green
solvents
(NADESs).
Various
spectroscopic
and
morphological
techniques
analyzed
as-synthesized
particles.
Acetaminophen
(ATP)
metformin
(MTF)
were
selected
as
model
drug
compounds.
The
electrochemical
detection
photocatalytic
degradation
ATP
MTF
upon
ultraviolet-visible
(UV-vis)
light
irradiation
in
presence
as-prepared
particles
an
active
are
examined.
present
study
displayed
that
proposed
has
enhanced
catalytic
activity
achieving
optimum
experimental
conditions,
linear
ranges
=
0.01-25.90
μM
μM,
lower
limit
(LOD)
value
(ATP
0.0031
0.008
μM),
higher
sensitivity
toward
determination
obtained.
Similarly,
rate
constant
was
found
to
be
k
0.0082
min-1
0.0296
according
Langmuir-Hinshelwood
model,
benefitting
from
excellent
synergistic
impact
molecule.
Hence,
work
offers
innovative
insights
into
applicability
functional
material
remediation
emerging
pollutants
water
bodies
with
recovery
range
98.2-99.75%.