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Extraction of Natural Compounds From Plants
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CHAPTER 3
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INTRODUCTION TO ALKALOIDS
CONTENTS
3.1. Introduction ...................................................................................... 86
3.2. Background ...................................................................................... 86
3.3. Different Types of Alkaloids .............................................................. 88
3.4. Methods of Isolation ......................................................................... 93
3.5. Pharmaceutical and Medicinal Use of Alkaloids ...............................93
3.6. Alkaloids in Human Food and Drinks ...............................................95
3.7. Alkaloids as Stimulants ..................................................................... 96
3.8. Dark Nature of Alkaloids .................................................................. 96
3.9. Biological Roles ................................................................................ 97
References .............................................................................................100
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Natural Compounds: An Introduction
3.1. INTRODUCTION
In nature, there are numerous natural compounds. From amongst numerous
classes of naturally existing organic compounds like proteins, amino acids,
carbohydrates, flavonoids, steroids, lipids, and anthocyanins, the one that
appears to be quite distinct is alkaloids. What makes them unique? They
are derived from amino acids and could be synthesized like secondary
metabolites through plants and certain animals. These compounds play a
significant role in living organisms. Alkaloids found to be exceptionally
important for humans for ages, however, they are secondary metabolites,
which could advise that they are unusable (Fernandez et al., 2010). Alkaloids
exhibit strong biological impacts on human organisms and animals in
very small doses. Alkaloids are found not only in human everyday life
in drinks and food however also as stimulant drugs. They displayed
anticancer, pain relief and local anesthetic, antifungal, anti-inflammatory,
analgesics, antimicrobial, neuropharmacology, antimicrobial, and numerous
other activities. Alkaloids are beneficial as pharmaceuticals in medicine,
supplements, diet ingredients, and further applications in human life.
Alkaloids are also vital compounds in organic production for searching novel
synthetic and semisynthetic compounds with probably superior biological
activity than parent compounds (Kuchta et al., 2012; Chisholm, 2015).
3.2. BACKGROUND
Alkaloids are existing in nature mainly as a class of nitrogen-containing
organic compounds in fungi, bacteria, plants, and 3 organisms. They had
important biological activities, regularly being one of the significant active
constituents in Chinese herbal medicine. With advances in the partition
of natural products and the ongoing emergence of novel technologies and
techniques, the progress of alkaloid chemistry had extended. The huge
majority of alkaloids are existing in higher plants, especially in dicots,
and a rare one exists in the lower plants (Capasso et al., 2002). Alkaloids
could be classified through the source combined with chemical structures,
as cuscohygrine, a pyrrolidine alkaloid made from ornithine. Leonurine is
an obvious pharmacologically active guanidine alkaloid, being generally
considered as the predominant active principle of Leonotis and Leonurus
drugs. Its existence had only been proven for the aerial portions of Leonurus
japonicus Houtt. Leal et al. (2012) noticed a declining trend in the discovery
of novel alkaloids between 2000 and 2009, conflicting with an enhancing
number of novel terpenoids. Fernandez et al. (2010) have stated that a sponge
Introduction to Alkaloids
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of the Spongosorites, which comprises the topsentin and nortopsentin class
of bisindole imidazole alkaloids, shows effective inhibition of Plasmodium
falciparum growth. The evaluation of biological roles, basic, and health
benefits obtained from the study of alkaloids could provide vital information
for upcoming pharmaceutical research (Frédérich et al., 2002; Dang et al.,
2012).
Alkaloids are a vast group of naturally existing organic compounds
which comprise atoms (amido or amino in certain cases) or nitrogen atom
in their structures. These nitrogen atoms make the alkalinity of these
compounds. These nitrogen atoms are generally located in some ring
(cyclic) structures. For instance, indole alkaloids are those that comprise
nitrogen atoms in an indole ring structure. Generally founded on structures,
alkaloids could be divided into classes like quinolones, pyridines, tropanes,
isoquinolines, indoles, pyrrolidines, pyrrolizidines, steroids, and terpenoids.
Another classication system is linked with a family of plant species that
exist. One of the instances is the opium alkaloids that exist in the opium
poppy (Papaver somniferum). These two diverse classication systems
make confusion amongst their chemical kinds of alkaloids and biological
distribution because there is no unique correlation (Capasso et al., 2002;
Czapski et al., 2014).
Alkaloids (whose name initially comes from “alkali-like”) could react
with acids and then produce salts, just like inorganic alkalis. These nitrogen
atoms could behave like a base in acid-base reactions. In common alkaloids,
which are treated as amines, similarly, as amines in their names, had sufx-
in. Alkaloids in pure form are generally odorless, colorless crystalline solids,
however sometimes they could be yellowish liquids. Quite regularly, they
had a bitter taste. Currently, more than 3000 alkaloids are recognized in over
different 4000 plant species (Karou et al., 2005; Zhang et al., 2013).
These compounds are formed usually through many plant species,
primarily by owering plants and also through certain animals. Plants
produce and store numerous organic compounds like proteins, carbohydrates,
fats, amino acids, and alkaloids, which are generally treated as secondary
metabolites. They are stored in every part of the plant root, stem, leaves, and
fruits of plants, however in different amounts. It was proposed that they are
plants’ leftover products, however now proof suggests that they play some
signicant biological function in plants (Ye et al., 2013; Zhang et al., 2015).
Certain groups of structurally associated alkaloids are existing in plants
from a few to even 30. These alkaloids t the same class however certain
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differences in their structure had, and one of them generally occurs in the
majority. Certain plant families are very rich in alkaloids. For instance,
in plants like ergot fungus (Claviceps) and the opium poppy (Papaver
somniferum), there are around 30 different alkaloid kinds. In plants, their
function is still generally unknown. Alkaloids, due to their bitter taste, are
natural compounds to daunt herbivorous organisms. In certain plants, they
are utilized as natural pesticides. It was proposed that alkaloids in plants
had a function to shield them from the destructive activity of certain insect
species. Alkaloids also exist in certain animal species like New World beaver
(Castor canadensis), lizards, and frogs (poison dart frogs (Phyllobates), and
they are produced through ergot and fungi species (Zhao and Tan, 2012; Ge
et al., 2015).
Natural Compounds: An Introduction
3.3. DIFFERENT TYPES OF ALKALOIDS
3.3.1. Berberine
Berberine (Figure 3.1(a)) is an isoquinoline alkaloid quarantined from
Chinese herbs like Coptidis Rhizome. It had been utilized for the treatment
of diarrhea and further gastrointestinal infections like an antibacterial drug.
In latest years, it was stated to have useful impacts on the metabolism
disorders states of diabetes. The mechanisms of action are various, like
lowering blood glucose, ameliorating the insulin-resistant state, controlling
blood cholesterol and triglyceride, persuading the task of the pancreatic
beta-cell (Shen et al., 2010). Lately, berberine had been reported to hold
anticancer activities. Amongst the numerous cellular targets of berberine is
AMPK (AMP-activated protein kinase), which controls tumor progression
and metastasis. Berberine reduced the migration of HCT116 and SW480
cells and triggered AMPK in human colon cancer cell lines. Particularly,
berberine-induced activation of AMPK decreased the integrin β1 protein
levels and reduced the phosphorylation of integrin β1 signaling targets (Park
et al., 2012).
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