J. Biomedical Science and Engineering, 2008, 1, 147-151
Published Online November 2008 in SciRes. http://www.srpublishing.org/journal/jbise JBiSE
Recent developments in biomedicine fields for
laser induced breakdown spectroscopy
Xian-Yun Liu, Wei-Jun Zhang
Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 1125, Hefei, Anhui 230031,
P.R. China. Correspondence should be addressed to Wei-Jun Zhang (wjzhang@aiofm.ac.cn), Tel.: +86 551 5591961.
Received on March 13, 2008; revised and accepted on September 9, 2008
Laser induced breakdown spectroscopy (LIBS)
can be used to determine solid, liquid, colloi-
dal, and biological samples. It is a promising
technique for analysis and characterization of
the composition of a broad variety of objects.
This review describes in brief the basic prin-
ciples and technological aspects of LIBS, and
the most recent progress of the various ap-
plications of this technique in biomedicine
fields will be reviewed in detail, including
bio-aerosols detection and identification, tis-
sue analysis, mineral analysis in human body,
and detection of zinc in human skin. Finally
new approaches and the prospects in bio-
medicine fields of LIBS technique are de-
Keywords: Biomedicine, LIBS, Elemental
analysis, Atomic emission spectroscopy.
There are at least about 40 chemical elements in the liv-
ing organisms of a human body. These elements can be
grouped into three groups: The major group comprising
H, C, N, O (~96.6%); The trace elements group com-
prising Na, Mg, P, S, Cl, K, Ca , Fe, Mn, Co, Zn and Ni
(< 5%); The minor group of trace elements including V,
Mo, Li, F, Si, As, Br, Sn, I and Ba (0.001%) . Studies
about the possible correlation between some elements
and disease are often among the medicine experts’ and
biologists’ interesting. Different techniques are practiced
to investigate the correlation between the consumption of
certain elements and certain types of disease, including
complementary DNA microarrays and serial analysis of
gene expression [1]; matrix-assisted laser desorption
ionization mass spectroscopy [2, 3] and surface enhanced
laser desorption ionization mass spectroscopy [4]; x-ray
fluorescence and proton-induced x-ray fluorescence [5,
6]. All these techniques have the common disadvantages
of being time-consuming, expensive, and requiring a
relatively complicated sample preparation.
This review describes a modern analytical technique
based on emission of electromagnetic radiation produced
after excitation of atoms, ions or molecules, which has
been named Laser Induced Breakdown Spectroscopy
LIBS technique is a useful method for determining the
elemental composition of various solids, liquids and
gases. With many advantages as described in Table 1,
numerous experimental as well as theoretical investiga-
tion results are found in literature as well as several re-
view papers [7, 8, 9, 10] and three recent text books [11,
12, 13] have been published. However, only a few works
related to analysis of biomedicine samples by LIBS have
been reported so far. Detection of biomedical samples
has become urgent because of the threats of biological
warfare and epidemic spread.
Table 1. Advantages of LIBS.
1 The need for little or no sample preparation. The result is increased throughput, greater convenience and fewer opportunities for
contamination to occur.
2 Versatile sampling for all media, including solids, gases or liquids (also conducting and non-conducting materials).
3 Very small amounts of sample (0.1 µg to 1 mg) are vaporized, therefore LIBS can be considered as quasi non-destructive.
4 Permits analysis of extremely hard materials that are difficult to digest or dissolve (e.g., ceramics, glasses and superconductors).
5 Analysis in micro-regions offers a spatial resolving power of about 1-100 µm.
6 Multiple elements can be analyzed simultaneously.
7 Potential for direct detection of aerosols (a solid or liquid particle in a gaseous medium) or ambient air.
8 The analysis is simple and rapid (ablation and excitation processes are carried out in a single step).
SciRes Copyright © 2008
148 X. Y. Liu / J. Biomedical Science and Engineering 1 (2008) 147-151
SciRes Copyright © 2008 JBiSE
Shortly after the laser operation was first reported in a
ruby crystal in 1960, Brech and Cross [14] demonstrate
the first useful laser-induced plasm on a surface. This
was the “birth” of the LIBS technique and in subsequent
years significant milestones were made in the develop-
ment of this method.
LIBS is one method of atomic emission spectroscopy,
can determine the elemental composition of a sample
(solid, liquid, or gas). In LIBS, a high-power focused
laser pulse focuses in or on a sample, form the vaporiz-
ing and exciting plasma, as shown in Figure 1, the spec-
tra emitted are used to determine the sample’s elemental
Figure 1. LIBS spectrum emitted from atoms
A typical LIBS experimental setup built in our laborator
is shown in Figure 2. Pulses from a laser (typically
Q-switched Nd:YAG or excimer) are focused on the
sample surface using a lens and an intense broadband
continuum of light is released as a result of the
bremsstrahlung process during the plasma formation, and
then the plasma light is collected with a second lens or,
as shown in Figure 2, by a optical fiber. The light col-
lected by either component is transported to a frequency
dispersive or selective device and then detected.
Each firing of the laser produces a single LIBS meas-
urement. The spectrum is recorded by means of an ar-
ray-type detector. The detector includes photomultiplier
tube (PMT), photo diode array (PDA), charge coupled
device (CCD), and intensified charge coupled device
(ICCD). Because ICCD can be gated down to picosec-
onds kinetic measurements, and have excellent sig-
nal-to-noise ratio, nowadays ICCD become the popular
detector of LIBS experiments. Depending on the applica-
tion, time-resolution of the spark may improve the sig-
nal-to-noise ratio or discriminate against interference
from continuum, line, or molecular band spectra.
Commercial LIBS instrument has come forth in recent
years, and continued study and research into improving
the detection limits, precision, and accuracy is required.
Pulsed Laser
Focusing Lens
Digital delay
pulse generator
Focusing Lens
Laser Spark
Mir r o r
Optical Fiber
Figure 2. Typical LIBS experimental instrumentation
X. Y. Liu / J. Biomedical Science and Engineering 1 (2008) 147-151 149
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4.1. Analysis of Biological Aerosols
The analysis of microscopic particles, aerosols, and cells
has received increased interest in recent years, especially
bio-aerosols (bacteria, fungi, viruses, pollen) have at-
tracted wide attention because they are found nearly
everywhere and of the threats of biological warfare and
epidemic spreads. Inhaled minute amounts of
bio-aerosols can cause disease or toxic or allergic reac-
tions. Thus determination and monitor the presence of
airborne particulates and their actual concentration is of
high interest. LIBS is found to be the most convenient
technique for in-situ and real-time measurement of metal
species in the gaseous and aerosol phases, thus it is suit-
able for analysis and characterization of biological aero-
Time-resolved laser-induced breakdown spectroscopy
(TRELIBS) is a method that has the advantages of rapid,
reliable, and highly selective. Stéphane Morel et al. [15]
use TRELIBS to detection and sort species. They choose
six bacteria (including Bacillus globigii as a surrogate for
Bacillus anthracis) and two pollens in pellet form for
detection, and get the conclusion that TRELIBS exhibits
a good ability to differentiate among all investigated
species, whatever the culture medium, the species or the
Samuels et al.[16] analyzed bacterial spores, molds ,
and pollens using LIBS technique with a broadband
spectrometer (200-900nm). The authors analyzed each
LIBS spectrum using principal-components analysis
method, and found to contain adequate information to
discrimination among the biomaterials. They got the re-
sult that it was possible to discriminate between the bac-
terial spores and the molds and pollens.
Kim and coworkers [17] examined five bacterial
strains (Bacillus thuringiensis T34, Escherichia coli
IHII/pHT315, Bacillus subtilis 168, Bacillus megaterium
QM B1551, and Bacillus megaterium PV361.) using
LIBS, performing measurements directly on the bacterial
culture plates. The difference in bacterial strains was
clearly distinguished by two-dimensional charts of the
bacterial components, calcium versus phosphate. The
authors noted that their experimental results demonstrate
the potential of the LIBS method for rapid and precise
classification of bacteria with minimum sample prepara-
Hybl et al. [18] examined some common biological
agent simulants (Bacterial spore, Media/protein, Fun-
gal/mold spores, and pollen) using spectrally broadband
LIBS system. Instead of using pellets or sub-
strate–deposited layers, homogeneous samples were
aerosolized in a micro-centrifuge tube by two ways: by
making use of the laser-induced shock wave or aerosol-
ized acoustically by dispersing a dry power suspension
above a loudspeaker. From the experiments they demon-
strated that LIBS has significant potential as a
bio-aerosol classifier and that LIBS technique is able to
resolve differing elemental ratios in biowarfare-agent
simulants and in common biological and environmental
Boyain-Goitia et al. [19] analyzed single biological
microparticles (pollens of a variety of flowers) by the
method of LIBS for the first time. Their experimental
results demonstrated that single-laser-pulse laser-induced
breakdown spectroscopy can be performed on single
biological microparticles, and that many more species
need to be measured to generate a suitable reference li-
brary before detection and identification can be made
reliably in real time.
In recent years many researchers are focused on the
detection and identification of individual bio-aerosols
using LIBS. Dixon et al. [20] demonstrated the feasibil-
ity of LIBS-based single-shot analysis of mental-rich
bioaerosols(Bacillus sporses). Beddows and Telle [21]
discussed the prospects of real-time, in situ laser-induced
breakdown spectroscopy applied for the identification
and classification of bio-aerosols (including species of
potential bio-hazard) within common urban aerosol mix-
tures. Compared laser-induced breakdown spectroscopy
measurements with data from a mobile single-particle
aerosol mass spectrometer (ATOFMS), they got results
that data from the ATOFMS provide statistical data over
an extended period of time, highlighting the variation of
the background composition. Baudelet and coworkers
analyzed Escherichia coli using femtosecond pulses
LIBS system [22], they also compared it with the nano-
second regime [23]. Gibb et al. [24] realized
size-selective sampling of Bacillus anthracis surrogate
spores from realistic, common aerosol mixtures by LIBS.
Diedrich and coworkers [25] analyzed four strains of
Escherichia coli bacteria using LIBS with nanosecond
pulses. The experimental results show that LIBS has the
ability to discriminate an environmental strain from a
pathogenic strain, which suggests the possibility of using
LIBS as a practical diagnostic test to identify strains ob-
tained from environmental assays.
4.2. Tissue Analysis
Cancer diagnosis and classification is extremely compli-
cated and, for the most part, relies on subjective inter-
pretation of biopsy material. Automated, real-time diag-
nostic procedures would greatly facilitate cancer diagno-
sis and classification. LIBS can detect the elemental con-
stituent in both low and high atomic number elements,
and can provide rapid, non-destructive tissue analysis.
For the first time Kumar et al.[26, 27] demonstrate in
principle that LIBS can be used for tissue analysis, spe-
cially the ability to differentiate between malignant and
normal tissue. By analysis of malignant and normal tis-
sue from a canine hemangiosarcoma, they found distinct
differences in elemental composition in two type of sam-
ple. Figure 3 is the LIBS spectrum they got from the
malignant and normal tissue cells of dog liver [27]. They
concluded that the line intensity ratios of different ele-
ments can be used to determine the concentration ratio of
150 X. Y. Liu / J. Biomedical Science and Engineering 1 (2008) 147-151
SciRes Copyright © 2008 JBiSE
Figure 3. LIBS spectrum of malignant and normal tissue cells of dog liver [27].
the trace elements in the tested tissue.
4.3. Mineral Analysis in Human Body
The analysis of important minerals and potentially toxic
elements within mineralized tissue (bones, teeth, dental
materials) has caused much attention in recent years.
Samek and coworkers [28, 29, 30, 31, 32] performed
quantitative LIBS analysis of trace element concentration
in calcified tissue. They demonstrated the possibility to
distinguish unequivocally between healthy and caries
infected teeth, and that LIBS analysis could be imple-
mented and used in dental drilling using lasers. Fang et
al. [33] use LIBS to analyze and identify elemental con-
stituents of urinary calculi. They measured seven differ-
ent urinary stone samples, the concentrations of elements
detected with their experimental system were found to be
widely different in different samples. Then they con-
cluded that LIBS technique has the potential for routine
clinic applications in urological disorder diagnosis.
Corsi and coworkers [34] measured the concentration
of the main minerals present in human hair using Cali-
bration-Free Laser-Induced Breakdown Spectroscopy
(CF-LIBS) and compared their results with the results
obtained through a commercial analytical laboratory,
and got the conclusion that CF-LIBS is a very promising
technique for hair tissue mineral analysis.
4.4. Zinc Analysis in Human Skin
It is well known that trace elements in skin, such as Zn,
Ca and Fe, have important roles in the regulation of cell
turnover, cell metabolism, and apoptosis.
Sun et al. [35, 36] use LIBS to detect trace metals in
human skin for the first time. They used LIBS to evalu-
ate the effectiveness of barrier creams as a means of pro-
tection against the absorption of zinc ions. Their experi-
mental results indicated that Zn was absorbed through
the skin and the concentration decreased exponentially
with depth into the skin and that LIBS is a useful tool for
trace elemental analysis in human skin.
This review paper presents the most recent development
of LIBS in biomedicine fields. In the past decade there
has been a burst of research activities in the use of LIBS
for analysis of trace elements in biomedicine matrices.
From above description we can see that LIBS is an effec-
tive technology in the detection and monitoring of a wide
range of elements in human body, and that LIBS tech-
nology has great potential for clinical practice. Contin-
ued improvements in instrumentation, the understanding
of laser plasma, and data analysis of LIBS technique are
currently an active area of research for many groups. In
the future, the research will bring extensive development
of LIBS in biomedicine fields.
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