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9.6 Chemometric Tools and Data Analysis 181
and characterization of bioactive compounds in natural
products [78].
9.5.2 LC-NMR-MS for Comprehensive Structural Elucidation
Zeper Abliz reported the use of LC-NMR-MS for thorough phytochemical structural revealing. Here, the
structures of natural compounds in crude extracts were
concurrently identified by combining LC-MS and NMR.
By co-analyzing parallel visualized multispectroscopic
datasets from 1H NMR and, LC-MS a novel method
known as NMR/LC-MS parallel dynamic spectroscopy
(NMR/LC-MS PDS) was investigated for finding intrinsic
correlation between data of mass/charge (m/z), retention time (Rt), and chemical shift (δ) obtained from the
same constituent from mixture spectra. A series of
incompletely separated fraction’s constituent concentration variation caused signal amplitude co-variation,
which, in turn, caused correlations between the 1H NMR
signals and extracted ion chromatogram (XIC) originating from the same individual constituent across fraction
ranges and intensity changing profiles in the spectrum of
NMR/LC-MS PDS. Twelve components, including flavonol glycosides, were identified by NMR/LC-MS PDS in
extract containing active herbals. These elements were
then divided into several fractions using flash column
chromatography. Accompanying the particular ingredient in the crude extract, corresponding spectral data was
concurrently found from mixed spectra. Specifically, it
was possible to identify two sets of co-eluted isomers.
The findings revealed that NMR/LC-MS PDS joint with
the incomplete separation approach attained a similar
function to online LC-NMR-MS investigation in an
offline manner and had the perspective to simplify and
accelerate the analytical ways for structural elucidation
of phyto-constituents [79].
9.6 Chemometric Tools and Data Analysis
Chemometric tools and data analysis techniques are
important for the study of phytochemicals, facilitating
extraction of valuable insights from intricate datasets.
Principal Component Analysis (PCA) serves as a
cornerstone in this endeavor, offering a means of dimensionality reduction and data visualization [80]. By identifying patterns and relationships among variables in
high-dimensional datasets, PCA aids in exploring the
variability in phytochemical composition across different
samples or plant species. Hierarchical cluster analysis
(HCA) complements PCA by enabling the grouping of
samples based on similarities or dissimilarities, thereby
facilitating the classification of samples with similar
chemical profiles [81]. Partial least squares regression
(PLS) and its extension, orthogonal projection to latent
structures (OPLS), further enhance the analytical toolkit
by modeling relationships between predictor variables
(e.g. phytochemicals) and response variables (e.g. biological activity), particularly in the context of quantitative
structure–activity relationships (QSAR). Variable selection methods and machine learning algorithms augment
these techniques by identifying relevant variables and
capturing nonlinear relationships, respectively, thus enabling researchers to unravel the complexities of phytochemical data and harness their potential for the discovery
and development of novel phytopharmaceuticals and
natural products [82].
9.6.1 Multivariate Analysis Techniques and Quality Control and Pattern Recognition Methods
Multivariate analysis techniques, such as PCA and partial
PLS, enable the simultaneous analysis of multiple variables
in complex phytochemical datasets, aiding in the identification of patterns, correlations, and trends. Quality control and
pattern recognition methods, including HCA and outlier
detection, play a key part in guaranteeing the reliability and
consistency of phytochemical data. These methods help
identify abnormal variations and patterns within datasets,
allowing researchers to maintain data integrity and make
informed decisions during analysis and interpretation.
Lately Slim Smaoui and co-workers reported that there
was a growing trend toward utilizing botanical extracts and
natural products as safe alternatives as antimicrobial and
antioxidant agents. In this study, ethanol, ethyl acetate with
water extracts of Ephedra alata from seven different geographic localities of Tunisia underwent phytochemical
assessment and evaluation for their bioactivity with antibacterial and antioxidant effects. Substantial variations
were observed with respect to phytochemical content, antifood-borne bacterial activity, and antioxidant activity
among the populations of E. alata. In addition to this, linear
regression analysis revealed that average annual precipitation (AAP), altitude, relative air humidity (RH), and average annual temperature (AAT) like environmental factors
were also responsible for variation in the quantitative analysis of phytoconstituents. Specifically, AAP and altitude
showed a positive effect on TFC, while an increase in AAT
was straightway associated with TPC, TFC, and total anthocyanins content (TAC). In all this above evaluation of
extracts, an approach of chemometry, including HCA and
PCA was used. The results revealed that the E. alata’s seven
182 9 Modern Analytical Techniques for Quality Control and Chemical Identification of Phytochemicals
populations could be geographically classified into four
distinct groups. Additionally, correlations between obtained
results were analyzed using Pearson coefficient correlation.
These findings provide valuable insights for the identification of appropriate habitats with solvents of extraction for
effectively harnessing the phytochemicals [83].
In recent times, one of the best techniques materialized
for the assessment of quality of food supplements and herbal
medicines is chromatography-assisted fingerprint approach.
To address the challenges like chromatographic fingerprint
complexity and instrumental variation of chromatography
with variation in experimental setups, this chemometric
method was in practice [84]. The research aimed to devise
novel analytical techniques for multivariate phytoconstituent profiling present in bud preparations from eight tree species, generally utilized in phyto-based therapy. The
techniques employed were geared toward identifying and
quantifying key bioactive compounds such as polyphenols,
organic acids, and vitamins. Such approach sought to establish a distinct botanical profile facilitating the assessment of
the impact of each phytochemical class in the overall phytocomplex of the bud preparations. By employing chemometric methodologies, distinctions among various genotypes
were made to ensure the authenticity, quality, and safety of
the raw botanicals. The devised model was characterized by
its simplicity, sensitivity, and reliability, rendering it suitable
for both quality assurance and evaluation of natural food
supplements and bud extracts. Such anticipated methodology was effectively utilized in profiling of commercial bud
preparations, underscoring its efficacy in characterizing
natural material. This innovative methodology serves as a
valuable substitute in the enhancement of the classification
accuracy of herbals featuring complex chromatographic
profiles. The development of a “multivariate chromatographic fingerprint” is imperative for discerning herbal
preparations based on their genotype, thereby mitigating the
risks associated with substitutions, alterations, or adulterations with other species or synthetic compounds [85].
9.7 Advanced Technologies
Metabolomics has emerged as a powerful tool in phytochemical analysis, allowing for the comprehensive study of
plant metabolites and their interactions [86]. By employing
advanced molecular imaging techniques, metabolomics
enables the visualization and quantification of metabolites
within plant tissues, offering insights into their spatial distribution and metabolic pathways. This integrated approach
facilitates a deeper understanding of plant biochemistry
and the identification of key phytochemicals for various
applications, from medicine to agriculture [87].
9.7.1 Metabolomics in Phytochemical Analysis and Molecular Imaging Techniques
Augustin Scalbert and colleagues conducted a study comparing lignin’s metabolism with structurally similar
sinapic acid (SA) and ferulic acid (FA). Five different rat
groups (n = 5) were supplemented with different dietary
regimens for two days: a control group (C) received a purified diet, and other groups received lignin-enriched wheat
bran (3% of the diet, wt:wt), poplar wood lignins (0.42%),
FA (0.42%), or SA (0.42%). LC-MS analysis was performed
on samples of urine obtained after one and two days.
The study compared metabolic profiles, providing semiquantitative data on hundreds of metabolites, and employed
multivariate statistical analysis (partial least squares for discriminant analysis). Results revealed similarities between
the lignin-received and control groups, indicating that
lignins are not absorbed and remain inert in the body. In
contrast, the metabolic profiles of the phenolic acid-supplemented groups differed notably than control. Such variations were primarily attributed to non-metabolized FA and
SA, as well as metabolites excreted in urine. Among these
metabolites, 13 were recognized as sulfate esters and glucuronide and glycine conjugates of the same phenolic acids,
along with dihydrosinapic, vanillic, and benzoic acids. Such
investigation underscores how metabolomics enables the
identity of new metabolites of phytoconstituents and facilitates the distinction of individual fed different phytochemical-containing foods [88].
9.8 Challenges and Future Perspectives
Challenges in phytochemical research include the complexity of plant metabolites, standardization of extraction
methods, identification of bioactive compounds, and regulatory issues [89]. Future perspectives involve integrating
omics technologies, leveraging bioinformatics for data
mining, developing novel delivery systems, exploring personalized nutrition approaches, and validating traditional
herbal remedies through ethnopharmacological studies.
These efforts aim to advance our understanding of phytochemicals and maximize their potential for improving
human health.
9.8.1 Current Challenges in Phytochemical Analysis
Phytochemical analysis faces several challenges in current
research. First, plant extracts are complex mixtures of
various phytochemicals, posing difficulties in accurately
9.9 Conclusion 183
identifying and quantifying individual components.
Additionally, there is a lack of standardization in extraction,
isolation, and analysis procedures, hindering result comparison across different studies and laboratories. Moreover, the
processes of bioassay-guided fractionation and isolation of
active phytomolecules are both time-consuming and costly,
discouraging investment from pharmaceutical industries
and government agencies in medicinal plant-based research
programs. The limited availability of reference compounds
further complicates phytochemical analysis, leading to challenges in compound identification and quantification.
Interference from matrix components present in plant
extracts can also disrupt accurate analysis. Furthermore, the
bioavailability and bioefficacy of phytochemicals remain
incompletely understood, posing challenges in predicting
their therapeutic potential. Finally, the evolving regulatory
framework surrounding phytochemical analysis and the use
of plant extracts in pharmaceuticals creates uncertainty for
researchers and industries alike. These challenges underscore the need for continued advancements in phytochemical analysis methodologies and regulatory standards to
overcome current limitations and unlock the full potential
of plant-based therapeutics.
9.8.2 Future Directions and Emerging Technologies
Future directions and emerging technologies in phytochemical research hold significant promise for advancing
our understanding of plant-based therapeutics. First,
extraction technique advances, including extraction using
microwave and supercritical fluid, offer the potential to
enhance the quality and yield of phytochemicals, thereby
optimizing their therapeutic efficacy. Additionally, the
adoption of high-throughput screening methods like
GC-MS and LC-MS can expedite the discovery of novel phytochemicals and their therapeutic applications. Integrating
metabolomics and proteomics can offer deep insights into
biological pathways and underlying mechanisms of action
of phytochemicals. Moreover, leveraging artificial intelligence and machine learning algorithms holds promise in
improving the accuracy and efficiency of phytochemical
analysis, as well as in predicting bioavailability and bioefficacy. Collaboration among researchers, industries, and regulatory agencies is essential for developing standardized
procedures and protocols, ensuring the quality and comparability of results. Furthermore, synthetic biology offers
opportunities to engineer plants for enhanced production
of specific phytochemicals, enabling a more sustainable
and cost-effective source of these compounds. Finally, integrating phytochemical analysis with personalized medicine
can pave the way for tailored therapeutic strategies based on
individual genetic profiles and phytochemical responses,
ushering in a new era of precision medicine.
9.9 Conclusion
In conclusion, the advent of modern analytical techniques
represents a paradigm shift in the realm of phytochemical
analysis, ushering in an era of unprecedented precision,
efficiency, and depth of insight. These cutting-edge tools
empower researchers and industries to ensure safe, quality,
and efficacious phytomedicines through rigorous quality
control measures. Moreover, they open new avenues for
the discovery and characterization of important phytochemicals, fuelling innovation in phytotherapy and natural
product drug discovery. As we continue to harness the
capabilities of these advanced technologies, we stand
poised to unlock the full therapeutic potential of phytochemicals, ushering in a brighter future for plant-based
medicine and human health.
The advent of modern analytical techniques has heralded a new era in phytochemical analysis, marking a significant leap forward in our ability to identify and quantitate
bioactive compounds of plant origin. Due to integration of
advanced technologies like GC-MS, LC-MS, and NMR
spectroscopy, researchers now possess powerful tools that
offer unprecedented sensitivity, specificity, and speed in
phytochemical analysis. These methods enable the detection of even minute quantities of bioactive compounds,
allowing for a comprehensive understanding of plant
chemistry.
Moreover, the development of hyphenated analytical
practices, including HPLC-MS and GC-MS, has further
expanded the horizons of phytochemical analysis. By combining chromatographic separation with mass spectrometric detection, these methods enable simultaneous detection
of multiple compounds within complex mixtures and facilitate the elucidation of their structural characteristics. This
not only enhances the precision of phytochemical analysis,
but also provides valuable insights into the chemical diversity of plant extracts.
These advancements in analytical techniques have not
only revolutionized quality control practices within the
herbal industry, but also accelerated the discovery of novel
bioactive compounds with potential therapeutic applications. By enabling researchers to delve deeper into the
chemical composition of plants, modern analytical methods are driving innovation in phytotherapy and paving the
way for the development of new drugs and nutraceuticals
derived from natural sources. As technology continues to
evolve, we can anticipate further refinements in phytochemical analysis, unlocking new frontiers in plant-based
184 9 Modern Analytical Techniques for Quality Control and Chemical Identification of Phytochemicals
medicine and fostering a deeper appreciation for the pharmacological potential of botanicals.
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10
Classification and Therapeutic Applications of Plant Secondary Metabolites
Amna Javed1, Muhammad Saad Hashmi2, Uzma Javaid3, Rahima Amjad
1
Department of Nutrition and Dietetics, The University of Faisalabad, Faisalabad, Pakistan
2
Institute of Food Science and Nutrition, Bahauddin Zakariya University, Multan, Pakistan
3
Department of Anatomy, Sargodha Medical College, Sargodha, Pakistan
1
10.1 Introduction
Plant secondary metabolites (PSMs) are comprised of a
diverse group of compounds that do not directly contribute
to plant development, normal growth, or reproduction, but
instead mediate particular actions that improve plant survival and reproductive capacity. These metabolites have
molecular weights of less than 3000 Da. They are widely
employed for plant defense and environmental communication. While PSMs contain primary metabolites that are
vital in plant development, their chemical origin and composition vary among plant species, making them notable
for their structural variation and usefulness as medicinal
candidates and/or antioxidants. PSMs play a role in the cessation of infections, whether they be biotic or abiotic, as
well as plant stress responses, such as lowering abiotic
challenges like temperature, drought, salt, and UV light.
PSMs are multifunctional metabolites produced by plants
that influence plant color, taste, and scent and can be
extremely dangerous at high dosages. They differ from primary metabolites in which they are manufactured by a
diverse range of organisms, including plants, animals,
fungi, and bacteria. The four types of PSMs comprised of
(a) phenolic groups, (b) terpenes, (c) steroids, and
(d) nitrogen-containing compounds. These chemicals are
categorized into five primary types based on their structure
and are frequently created by selecting the appropriate
source explants as inoculums to manufacture [1, 2, 3].
10.1.1 Types of PSMs
PSMs are a category of low molecular weight chemicals that
serve a variety of functions, including growth and development. These include regulatory activities as well as acting as
precursors for primary metabolites. PSMs perform an
important role in herbivores as regulators and precursors of
primary metabolites. Plants produce at least five types of
PSMs, including: (a) glucosinolates, (b) benzoxazinoids, (c)
terpenes, (d) aromatics, and (e) green-leaf volatiles.
Plants produce PSMs, such as glucosinolates and benzoxazinoids. Glucosinolates (in Arabidopsis) have different
actions than benzoxazinoids in maize and wheat. However,
the direct involvement of benzoxazinoids and glucosinolates
as primary metabolites has yet to be demonstrated. Many
PSMs, such as indolic glucosinolates and green-leaf volatiles,
are segregated or kept in inactive forms. Flavonoids, terpenes, glucosinolates, and benzoxazinoids are all secondary
metabolite regulators. PSMs of many types provide plants
with a conserved, distinct, variable, and adaptable repertory
of regulators to control growth and development. Flavonoids
and terpenes are old and well-preserved, but glucosinolates
and benzoxazinoids are more recent [4].
10.1.2 Functions of PSMs
PSMs provide a variety of biological functions, from supplying essential amino acids to acting as food additives and cosmetic compounds. Some PSMs, such as alkaloids, have both
190 10 Classification and Therapeutic Applications of Plant Secondary Metabolites
pharmacological and recreational effects and are often used
as therapeutic agents because of their medicinal properties.
Furthermore, phenolic chemicals found in PSMs have antioxidant, anticarcinogenic, and anti-inflammatory characteristics, making them beneficial in drug development
along with the ability to reduce anxiety and pain.
Terrpenoids, another type of plant secondary metabolite,
possess antitubercular, anticancer, anxiolytic, and mutagenic effects. Furthermore, PSMs play an important role in
drug development, with alkaloids accounting for 50% of
plant-derived medicines. Despite significant advances in
understanding plants’ secondary metabolite activity, the
vast majority of their roles remain unknown. Nonetheless,
plants remain essential sources of bioactive natural medicinal chemicals, with phenylpropanoids being one of the
most important PSMs that provide critical aromatic amino
acids needed for human and animal health [2]. Thus, the
functions of PSMs are quite diverse, providing multiple
benefits to both plants and animals.
10.2 Classification of PSMs
10.2.1 Alkaloids
These are naturally occurring nitrogen-instituting blends
present in approximately 20% of plant species, albeit at
minute levels. They have complex chemical structures that
make synthesis difficult, as well as a diverse set of chemical
properties, such as basicity, solubility, and reactivity.
Alkaloids serve a wide range of biological roles, including
toxicological, pharmacological, nutritional, and esthetic
purposes [5, 6, 7]. Generally, they are procured by amino
acids, and their biosynthesis is feasibly, genetically changed
to boost output. Alkaloids are segregated into two types
depending on their chemical structure. They are chemically varied and typically derived from plant sources, containing one or more nitrogen atoms [5, 6, 8] and abundantly
found in flowering parts and a range of organs, including
(a) leaves, (b) flowers, (c) roots, (d) stems, (e) fruits, (f)
bark, (g) bulbs, and (h) seeds. A diverse range of alkaloids
could be found under the production of different plant species, and their number and distribution vary according to
the particular phase of the plant’s life cycle and species.
The Uncaria genus contains approximately 40 different
alkaloids of biological value, with mitraphylline being the
most important alkaloid found in 20 of 34 Uncaria species.
Catuabine (tropane) produced from Trichilia catigua A.
Juss. (bark) [6, 7, 8]. Berberine has been investigated for its
intriguing bioactivities, including antidiabetic benefits in
insulin-resistant rat models and antihypertensive, antiinflammatory, antioxidant, hepatoprotective, and anticancer properties. Achillein, an alkaloid, is found in the plant
Achillea millefolium [9]. Finally, alkaloids are a diverse
group of bioactive compounds in plants with various
chemical and biological properties.
Alkaloids are wide-reaching chemical compounds playing discrete roles. They are a major class of PSMs, accounting for nearly 20% of all plant-based PSMs. Alkaloids
contain antibacterial, antiproliferative, and antioxidant
properties that can be employed in medicinal formulations.
Many alkaloids have great therapeutic potential, including
antiviral, anticancer, analgesic, and antitubercular properties, which has led to their industrial application [9].
Alkaloids have a range of functions in plants, including herbivore and pathogen defense, allelopathy, seed dispersal,
and pollinator attraction [7].
Some alkaloids are harmful to various species, helping
plants defend against illnesses and preventing nonspecialized herbivores from grazing, while others increase pollination interactions by elevating pollinator visits and so
promote plant reproduction. From a therapeutic standpoint, alkaloids have resulted in the development of herbal
medicines and components. Oxyboldine and bold oval are
two alkaloids with morphine-like characteristics, while
significant alkaloids like boldine, codeine, narceine, and
morphine play important roles in therapeutic therapy.
Codeine is linked to narcotics containing opioids. Indole
alkaloids are alkaloids with antibacterial, antifungal, central nervous system (CNS)-stimulating, and antiviral properties. They are also antiparasitic, cytotoxic, possess
serotonin and antagonistic domains, and have anti-inflammatory and antiviral properties, offering discrete medical
and pharmacological qualities and pioneering in medications and therapies [9].
10.2.2 Terpenoids
The most distinctive cluster comprising of natural blends is
found in almost all living organisms, with around 60 000
structures found from natural sources. Terpenoids are naturally occurring chemical compounds formed from isoprene and its derivatives; they are also referred to as
isoprenoids or terpenes. These compounds have a cyclic
structure instituting varied biological functions, sorted into
several types in conformity with a number of isoprene
units per molecule, including hemiterpenoids, monoterpenoids, diterpenoids, sesquiterpenoids, sesterterpenoids,
triterpenoids, and polyterpenoids [10, 11, 12]. Terpenoids
enhance the palate, perfume, and color of plant leaves,
flowers, and fruits, and they are key components of essential oils produced by aromatic plants and tree resins like
turpentine. Furthermore, certain terpenoids also exhibit
high pharmacological bioactivity and therapeutic properties helping medicinal chemists [11]. Terpenoids are among