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Probing and Quantifying the Food-Borne Pathogens and Toxins: From in vitro to in vivo Jing-Min Liu, Zhi-Hao Wang, Hui Ma, and Shuo Wang J. Agric. Food Chem., Just Accepted Manuscript • DOI: 10.1021/acs.jafc.7b05225 • Publication Date (Web): 17 Jan 2018 Downloaded from http://pubs.acs.org on January 17, 2018
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Journal of Agricultural and Food Chemistry
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Probing and Quantifying the Food-Borne Pathogens and
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Toxins: From in vitro to in vivo
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Jing-Min Liu, Zhi-Hao Wang, Hui Ma, and Shuo Wang*
4
Tianjin Key Laboratory of Food Science and Health, School of Medicine,
5
Nankai University, Tianjin 300071, China
6
7
*Corresponding author
8
(Shuo Wang) Mail to: No.94 Weijin Road, Tianjin, 300071, China.
9
Email:
[email protected]; Tel: +86-22-85358445
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ABSTRACT
11
Development of real-time and in situ analytical methods for determination of
12
food-borne pathogens and toxins ingested into human body would be a promising
13
research direction in the food safety area. The present review starts with
14
summarization of the up-to-date progress of the nanomaterial-assisted in vitro
15
detection methods for pathogens and toxins, and finally focused on application of
16
animal bioimaging to in vivo study, including prospective strategies for in vivo
17
quantification of target pathogens or toxins and in vivo investigation of their behaviors
18
inside the living body, with the assistance of real-time and non-invasive optical
19
bioimaging. This review provides the advisory direction for food-safety research,
20
from in vitro to in vivo, along with a prospective discussion of the further
21
development roadmap of the food-safety detection techniques, especially the
22
bioimaging-guided methods for investigation and mediation of food contamination
23
effect to human health.
24 25
KEYWORDS: food-borne toxins, pathogens, in vivo detection, nanomaterials,
26
bioimaging
27
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INTRODUCTION
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In recent years, food safety has become a challenging field and emerged as a major
30
threat to public health world-widely, with the increasing demand of minimizing the
31
occurrence of food-borne diseases.1 With the globalization of economy, rapid
32
movement of people and international trade have increased the risk of food-borne
33
diseases, generally caused by the consumption of contaminated food or water.2
34
Therein, food contamination could be partly ascribed to the exposure to pathogens
35
through water, air, and contact with soil, fertilizer, and the food processing
36
environment, from raw material production to final consumption.
37
As a global priority, efficient identification and quantification of food-borne
38
pathogens and toxins (sterigmatocystin, aflatoxin, ochratoxin, etc.) has come to be a
39
general research topic. Great effort has been made on the fabrication of rapid,
40
sensitive, and selective analytical methods to quantify harmful substances in food
41
products, including the fluorescence sensing, colorimetric detection, electrochemical
42
sensing, chromatographic separation, and immunoassays.3 With the increase of
43
diversity and complexity of the food-borne toxins, researchers are urged to know the
44
specific actions of pathogens and toxins when ingested into the living body. Purely
45
quantifying the concentrations or levels of pathogens or toxins in a certain sample
46
provides limited information in vivo.
47
Development of real-time and in situ analytical methods for sensitive and selective
48
determination of food-borne pathogens and toxins ingested into human body would be
49
the promising research direction in the food safety area, so as to clarify the harmful 3 ACS Paragon Plus Environment
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action mechanism inside the human body. Real-time and in situ analytical methods
51
could not only improve business efficiency owing to the faster release of products
52
without waiting for the results of time-consuming tests, but also clarify the harmful
53
action mechanism inside the human body through in situ collecting the information of
54
pathogen behaviors. Compared with the conventional in vitro detection methods
55
mentioned as determination of the target analytes in certain food or biological samples,
56
optical imaging technology with real-time monitoring and non-damage detection
57
ability appears as the advanced methodology for probing the toxins. Nanophosphors
58
with excellent optical property and biocompatibility, such as persistent luminescence
59
nanophosphors (PLNPs),4 quantum dots (QDs),5 carbon nanodots (CDs),6 and
60
upconversion nanoparticles (UCNPs),7 were introduced as ideal contrast agents for in
61
vivo bioimaging and the functional nanoprobes to specific recognition of the target
62
pathogens or toxins inside the living body with the assistance of antibody or aptamer.
63
Nanomaterial-involved bioimaging would open up a new way for probing the
64
food-borne toxins via the involvement of bioimaging, and broaden the methodology
65
development for food safety investigation based on the advanced functional
66
nanomaterials.
67
The present review starts with the up-to-date progress of the nanomaterial-assisted
68
in vitro detection methods for food-borne pathogens and toxins, and finally focused
69
on application of animal bioimaging to in vivo probing the target pathogens or toxins.
70
This review provides the advisory direction for food-safety research, from in vitro to
71
in vivo, along with a prospective discussion of the further development roadmap of 4 ACS Paragon Plus Environment
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the food-safety detection techniques, especially the bioimaging-guided methods for
73
investigation and mediation of food contamination effect to human health. (Figure 1)
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IN VITRO DETERMINATION OF FOOD-BORNE PATHOGENS AND TOXINS
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Detection of food-borne pathogens by conventional approaches generally involves
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microorganism identification by morphological evaluation through selective
77
enrichment, biochemical analysis, and serological confirmation. Common methods
78
for detection of pathogens or toxins are mainly polymerase chain reaction (PCR),
79
enzyme
80
chromatography (HPLC), mass spectrometry (MS), and morphological and
81
biochemical characterization.8, 9 In a typical assay, a simple and specific primer-probe
82
system based on a real-time polymerase chain reaction assay was fabricated to detect
83
Anisakis simplex parasite in seafood, realizing selective and sensitive determination of
84
trace parasite in marine products with a detection limit of 40 ppm.10 Reverse phase
85
liquid chromatography coupled to electrospray ionization mass spectrometry (LC–
86
ESI/MS) was applied to identify and quantify enterotoxins A and B from complex
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food samples with achieved detection limit of 0.5 g and 0.2 g, respectively.11
88
Combination of intact cell immune-capture with liquid chromatography−tandem mass
89
spectrometry has been proved to be effective for detecting Yersinia pestis in milk
90
samples, of which the sensitivity was better than that of ELISA analysis.12
linked
immunosorbent
assay
(ELISA),
high
performance
liquid
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Although the above conventional analytical methods have been extensively studied
92
and widely applied in food-safety inspection, these classical analytical approaches, to
93
some extent, were limited by the insufficient sensitivity and reproducibility, 5 ACS Paragon Plus Environment
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time-consuming steps, the requirements of highly qualified staff and complex
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operation, and huge economic investment. In recent years, functional nanomaterials
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with submicron-sized dimensions and unique physiochemical properties have opened
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up new horizons for food safety inspection and generated a large number of detection
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methods with improved analytical performance.9, 13 The functional nanomaterials for
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the detection of food contamination are at the heart of the effective sensing in terms of
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signal-readout because they impact the sensitivity of quantification, recognition
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selectivity and specificity, simplicity and speed, as well as overall quality and
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robustness of the detection performance.
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QDs are typical small semiconductor particles with size ranging from 2 to 10 nm
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that can emit light ranging from ultraviolet to infrared.14 Quantum confinement effect
105
originated from the nanometer size has endowed QDs with outstanding electro-optical
106
properties, such as high quantum yields, long fluorescence lifetimes, large extinction
107
coefficients, broad absorption spectrum, narrow and symmetric size-tunable emission,
108
pronounced photostability, and strong resistance to photobleaching, all of which make
109
them advantageous over the traditional fluorophores for sensing applications.15
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Upconversion nanoparticles are tunable optical luminescence nanomaterials, which
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have many advantages over the traditional organic fluorophores, such as narrow
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emission bandwidths and large anti-Stokes shifts.16 The UCNPs also provides an
113
antidote for the background effects of autofluorescence and light scattering, thereby
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greatly improving the signal-to-background ratio and sensitivity of detection.17 There
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is no obvious intensity loss in the long-term monitoring of the optical stability of 6 ACS Paragon Plus Environment
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UCNP-labeled targets, and low toxicity in vitro and in vivo makes them suitable for
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bio-applications.
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Plasmonic metal nanomaterials (PMNMs), typically gold nanoparticles (AuNPs)
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and silver nanoparticles (AgNPs), have particular physical and chemical properties as
120
well as good biocompatibility. The most distinctive feature of PMNMs is localized
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surface plasmon resonance (SPR), arising from the resonant oscillation of their free
122
electrons in the presence of light with a particular frequency.18 Due to their sensitive
123
spectral response to the local environment of nanoparticle surface and high density of
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electromagnetic filed, PMNMs have great potential for the fabrication of sensing
125
platform, especially via the colorimetric and surface enhanced raman scattering
126
(SERS) methodology.19
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Persistent luminescence nanophosphors are born with distinctive features, such as
128
long-lasting afterglow, low toxicity, and excellent biocompatibility, of which, most
129
importantly, the super-long persistent luminescence enable the PLNPs applied for
130
time-resolved fluorescence sensing in vitro as well as real-time bioimaging in vivo
131
without requiring any external simultaneous excitation of light sources.20, 21 Therefore,
132
PLNPs have attracted great attention as unique optical nanoprobes and opened up a
133
new research direction in the field of biological and biomedical research.
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The above advanced functional nanomaterials can be combined with suitable
135
analytical methodologies and detection techniques to generate various advanced
136
analytical methods for food-borne pathogen and toxin detection. The emerging
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nanomaterial-involved food-safety inspection methods include: sensitive and selective 7 ACS Paragon Plus Environment
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fluorescence sensing utilizing quantum dots (high quantum yields, narrow and
139
symmetric size-tunable emission, pronounced photostability) and upconversion
140
nanoparticles (high signal-to-background ratio and sensitivity due to large anti-Stokes
141
shifts ),22,
142
nanomaterials (localized surface plasmon resonance effect),24 and highly sensitive and
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in situ SERS methods using plasmonic metal nanomaterials,25 etc.
23
simple and rapid colorimetric detection using plasmonic metal
144
As the continuous increasing of food sample complexity and food contamination
145
variety, there are great demands for further development of analytical methods with
146
improvement on rapidness, sensitivity, specificity, robustness, and cost-effectiveness.
147
As for the rapidness, the conventional culture-based methods always involve cell
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proliferation steps, which are usually carried out in laboratory conditions overnight.
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The prolonged period to obtain results reflects cost-ineffectiveness and inconvenience,
150
especially for the food sample analysis that required high throughput and rapidness.
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While integrated with advanced functional nanomaterials, nanosensing techniques
152
have demonstrated fast detection ability, and the target analytes can be detected within
153
minutes to hours without the need of bacterial culture and concentrating. As fast and
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efficient detection of food-borne pathogens or toxins tends to be more practical that
155
could better satisfy the need of current customers and market, future effort would be
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guided into generating portable, miniaturized, and high-throughput detection methods
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or devices.
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As for the sensitivity, because food-borne pathogens and toxins usually have a low
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infectious dose and high health risk, detection methods possessing extremely low 8 ACS Paragon Plus Environment
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detection limit along with good reproducibility are always popular in food-safety
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inspection. The use of nanoparticles will help to detect food-borne pathogens rapidly
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and accurately with a low detection limit. Plasmonic nanoparticle-assisted SERS
163
detection is able to achieve extremely low detection limit, even to single molecule,
164
and the sensitivity could be further improved via involvement of nano-composite
165
materials.25-28 Nano-adsorbent based solid phase extraction coupled with optical or
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chromatographic detection is another effective method to obtain high sensitivity. Due
167
to the high surface area of nanomaterials, like graphene,29 carbon nanotubes,30 and
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nano-MOFs (metal-organic frameworks),31 selective preconcentration of target
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analytes from complex food sample matrix was realizable and highly sensitive
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detection of food-borne pathogens or toxins was achieved. Besides, incorporating
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functional nanomaterials into the electrode or onto the electrode surface generated the
172
highly-performed
173
Nanomaterial modification would increase the surface area of electrode, in turn
174
improve conjugation and catalyze redox reactions, which eventually improve the
175
electric catalytic performance and sensitivity.
electrochemical
methods
for
food-safety
inspection.32-35
176
As for the specificity, immunoassay based on specific antibody-antigen reaction is
177
very popular in biosensing, including drugs, hormones, proteins and microorganisms.
178
The basic principle is that soluble antigens and corresponding antibodies interact with
179
each other, forming insoluble antigen-antibody complex precipitation. Immunoassay
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have been developed to detect food-borne toxins with fluorescence immunoassay,
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enzyme-linked immunosorbent assays, and magnetic bead-based ELISAs.36 9 ACS Paragon Plus Environment
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In addition to the antibody, aptamer has come to be an alternative specific probe,
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widely used in the nanosensing platforms for food-safety inspection. Aptamers are
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typical single stranded DNA or RNA molecules with high affinity and selectivity to
185
bind targets.37 Unlike the complementary sequence base pairs, the high affinity of
186
aptamers is related to the specific folding under the binding condition. Aptamers are
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short oligonucleotides generally less than or equal to 10 kDa, selected for various
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molecular ions, amino acids, proteins, virus and the pathogenic bacteria, plant or
189
animal cells.38 Due to high selectivity, affinity and stability, aptamers have been
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utilized as effective recognition probe for fabrication of various sensing assays for
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food safety inspection.
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As for the robustness and cost-effectiveness, effort could be focused on the further
193
integration of nanostructures via one-pot preparation or green synthesis, like the
194
carbon nanomaterials (low cost and toxicity of the raw materials, green synthesis).
195
Besides, rapid detection assay based on the well-performed nanomaterials always
196
gives good reproducibility and repeatability to further improve the robustness of the
197
methodology.
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IN VIVO PROBING FOOD-BORNE PATHOGENS AND TOXINS
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In the past few decades, huge effort has been made on the research and development
200
of in vitro identification and quantification of various food-borne pathogens and
201
toxins, with continuous progress on the improved accuracy, sensitivity, selectivity, and
202
speed. However, as the increase of diversity and complexity of the food-borne toxins,
203
people are urged to know the specific actions of pathogens and toxins when ingested 10 ACS Paragon Plus Environment
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into the living body, not limited to purely quantifying the pathogens or toxins in a
205
certain sample. Therefore, development of real-time and in situ analytical methods for
206
sensitive and selective determination of food-borne pathogens and toxins ingested into
207
human body would be the promising research direction in the food safety area.
208
Real-time and in situ analytical methods could provide more intuitive information in
209
vivo, in favor of clarifying the harmful action mechanism inside the human body and
210
generating guideline for prevention and therapy of disease.
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Optical bioimaging technology, especially in vivo fluorescence imaging, have made
212
tremendous advance in serving as the noninvasive and nonionizing tool for highly
213
sensitive and real-time probing the life process inside the living body.39 In principle,
214
bioimaging techniques are realized by equipment of a sensitive camera and
215
appropriate filters to collect fluorescence emitted from the whole-body of living small
216
animals. With the assistance of imaging contrast agents, the well-established
217
fluorescence bioimaging is capable of visualizing biology in its intact and native
218
physiological state, widely applied in cancer diagnosis and human disease treatment.
219
However, there still existed some problems that hampered fluorescence bioimaging in
220
terms of the tissue penetration depth and signal-readout resolution, caused by the high
221
absorption, scattering, and intrinsic fluorescence by bio-entities or living tissues
222
almost across the whole electromagnetic spectrum.40 To overcome these limitations,
223
research efforts have been focused on development of advanced luminescent
224
nanomaterials as efficient contrast agents, named as nano-imaging methodology.41
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Various nanophosphors with respective advantageous property have been introduced 11 ACS Paragon Plus Environment
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as nanoprobes for in vivo nano-imaging, of which the most attractive nanophosphors
227
are QDs (high quantum yields, intense and tunable emission, ease of surface
228
modification, etc.), carbon nanodots (low toxicity, green synthesis, high stability, good
229
biocompatibility, etc.), UCNPs (anti-Stokes and NIR-activable luminescence, narrow
230
and intense emission, long lifetimes, low toxicity, superior photostability, etc.), and
231
PLNPs (super-long afterglow, in vitro excitation allowable and in vivo re-excitable
232
luminescence, superior structural stability and biocompatibility, low toxicity, ease of
233
surface functionalization, etc.). All these nanophosphors have been extensively
234
applied in in vivo bioimaging, including tumor targeting, molecule tracking, and drug
235
delivery.4, 42-45 In a typical assay, a multi-functional core-shell nanostructure, which
236
utilized Mn4+ and Ge4+ co-doped gadolinium aluminate PLNPs as the NIR
237
luminescence center and employed the gold nanoshell to enhance the luminescence,
238
was proposed for highly sensitive bioimaging of animal tumor, with excellent
239
biocompatibility and improved resolution.4 Based on above, it is expectable that
240
nanophosphor-assisted bioimaging with non-damage detection ability and real-time
241
monitoring holds great potential for in vivo probing the target pathogens or toxins
242
inside the living body, which would surely provide more reliable and in situ
243
information of in vivo actions and distributions of food-borne harmful substance.
244
The real-time and in situ bioimaging could be introduced to food-safety inspection,
245
including in vivo quantification of the target pathogens and toxins inside the living
246
body, probing their behaviors and distribution in vivo to further investigate the
247
pathogenesis, and bioimaging-guided drug-delivery to target infarction site for therapy. 12 ACS Paragon Plus Environment
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As there have been few examples of utilization of bioimaging for in vivo probing the
249
toxins or pathogens, herein we present several prospective research protocols of
250
bioimaging-assisted food-safety inspection, which are believed to be universal for
251
various food-borne pathogens or toxins investigation.
252
First, for in vivo quantification of the target food-borne pathogens or toxins,
253
fluorescence resonance energy transfer (FRET)-based fluorescence on-off switch that
254
involving luminescent NPs as emission center and adsorption structure as quencher
255
can be well-established. FRET is a typical non-radioactive process with the energy
256
transferring from the fluorescent donor to the acceptor in a way of intermolecular
257
dipole-dipole coupling, which only happens when the intermolecular distance in
258
between is less than 10 nm and the overlap of emission spectrum of donor and
259
absorption spectrum of acceptor is over 30%.46 In FRET-based fluorescence on-off
260
switch, the energy acceptors (AuNPs, AuNRs, CuS, graphene, etc.) and donors (QDs,
261
UCNPs, PLNPs, etc.) are brought to an appropriate distance exclusively through the
262
specific recognition (antigen-antibody, DNA hybridization, biotin-avidin, etc.), then
263
the fluorescence are quenched accordingly. Presence of target analytes would separate
264
the emitter and quencher, and the FRET is inhibited to recover the fluorescence,
265
through which process the target analytes are determined. This FRET-based
266
fluorescence switch could be easily utilized in activable-bioimaging of target
267
pathogens or toxins in vivo. (Figure 2)
268 269
Second,
for in vivo probing
the
behaviors
of food-borne
pathogens,
nanophosphor-labelling would be an effective way. In the previous proof-of-concept 13 ACS Paragon Plus Environment
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study, Cr3+-doped zinc gallogermanate (ZGGO) PLNPs with ultra-brightness, super
271
long afterglow, excellent biocompatibility, and low toxicity, was employed as targeted
272
contrast agents and optical nanoprobes for selective tagging the food probiotics,
273
Lactobacillus.42 Surface modification of PLNPs with antibody (Anti-Gram positive
274
bacteria LTA (lipoteichoic acid) antibody) ensured the success of in vitro labeling the
275
probiotics to form the PLNPs-probiotics conjugates, then treated with mice via oral
276
administration. The in vitro excitation of PLNPs ensured the highly sensitive and
277
long-term bioimaging in the living tissues, which eventually realized the tracing and
278
behavior monitoring of labeled bacteria inside the living body and probing the
279
bio-distribution in the gastrointestinal tract. The same procedure and methodology
280
could be applied for study of pathogens as well, through which the in vivo probing the
281
behaviors and tracking the distribution of pathogens would be achievable. (Figure 3)
282
Third, for bioimaging-guided in vivo drug-delivery to target pathogens and
283
infarction sites, nanophosphors integrated with specific layers that possess large
284
surface area (mesoporous silica, TiO2, metal-organic frameworks, covalent-organic
285
frameworks, carbon nanotubes, etc.) acted as the core-shell nanocarriers.
286
Nanophosphors were utilized as the emission core that provided the luminescence for
287
signal-readout during imaging, while drugs are loaded onto the nanocarrier surface via
288
interaction with the functional layers. Nanoimaging-guided in vivo drug delivery are
289
usually capable of effectively reducing the drug dosage, avoiding the possible damage
290
to normal tissues, and increase the precision of therapy. More importantly, it is
291
monitorable and controllable. (Figure 4) 14 ACS Paragon Plus Environment
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Taken together, in vivo probing methodology is believed to be the next-generation
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research roadmap for food-safety inspection and food science development, illustrated
294
by the above three possible strategies for in vivo quantification of target pathogens or
295
toxins and in vivo investigation of their behaviors inside the living body, with the
296
assistance of real-time and non-invasive optical bioimaging. The bioimaging-guided
297
in vivo probing the target food-borne pathogens or toxins holds the great potential as
298
the innovative methodology to clarify the harmful action mechanism inside the human
299
body and reveal the scientific relationship between food science and human health,
300
with the final goal of further promoting the development of prevention and therapy of
301
food-borne diseases.
302
ACKNOWLEDGMENTS
303
This work was supported by Beijing Municipal Science and Technology Project
304
(No.Z171100004517013), State Key Program of National Natural Science Foundation
305
of China (No.31430068), and National Key Research and Development Program of
306
China (No.2016YFD0401202).
307
CONFLICT OF INTEREST
308
The authors declare no competing financial interests.
309
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Figure 1. Schematic illustration of advanced nanomaterial-assisted analytical methods for
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Figure 2. Schematic illustration of FRET-based fluorescence on-off switch that involves
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Figure 3. Schematic illustration of in vivo probing the behaviors and tracking the
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Figure 4. Schematic illustration of bioimaging-guided in vivo drug-delivery to target
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TOC Graphic
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Prospective of further development roadmap of food-safety research, from in vitro to
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in vivo, especially the bioimaging-guided method for investigation and mediation of
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food contamination effect to human health.
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