Abstract
The aim of this study was to
evaluate the antibacterial properties of Hibiscus sabdariffa extracts. The
aerial parts, specifically the leaves, of Hibiscus sabdariffa was gathered from
the local market in Dutse Metropolis, Jigawa State, during the months of
November and December 2024. The findings indicated that the alcoholic extract
had a higher antioxidant activity than the ethanolic extract, showing values of
19.5% and 14.02%, respectively, at a concentration of 20 mg/ml. When the
concentration was increased to 100 mg/ml, both extracts demonstrated a notable
rise in antioxidant activity, with the alcoholic extract achieving 75.67%,
which is comparable to the synthetic antioxidant butylated hydroxytoluene
(BHT). The antibacterial effectiveness of the Hibiscus extracts was tested
against Staphylococcus aureus and Escherichia coli, revealing varying levels of
antibacterial activity. The zones of inhibition were observed to decrease as
the concentrations of the extracts were lowered. The findings indicated that
the alcoholic extract had a higher antioxidant activity than the aqueous
extract, showing values of 19.5% and 14.02%, respectively, at a concentration
of 20 mg/ml. When the concentration was increased to 100 mg/ml, both extracts
demonstrated a notable rise in antioxidant activity, with the alcoholic extract
achieving 75.67%, which is comparable to the synthetic antioxidant butylated
hydroxytoluene (BHT). The antibacterial effectiveness of the Hibiscus extracts
was tested against Staphylococcus aureus and Escherichia coli, revealing
varying levels of antibacterial activity. The zones of inhibition were observed
to decrease as the concentrations of the extracts were lowered. Overall, these
results underscore the potential health benefits of Hibiscus sabdariffa
extracts, particularly in boosting antioxidant defenses and offering
antibacterial properties. It is recommended that future studies conduct in vivo
investigations to evaluate the health benefits and safety of Hibiscus
sabdariffa extracts in animal models or human subjects.
TABLE OF CONTENTS
Contents
DECLARATION.. II
CERTIFICATION.. III
DEDICATION.. IV
ACKNOWLEDGEMENTS. V
Abstract VI
CHAPTER ONE.. 1
1.0 Introduction. 1
1.1 Background
of the Study. 1
1.2 Statement of
Research Problem.. 3
1.3 Aim and
Objectives of the Research. 4
1.3.1 Aim.. 4
1.3.2 Objectives. 4
1.4 Significance
of the Study. 5
1.5
Justification of the Study. 5
1.6 Scope of the
Study. 5
CHAPTER TWO.. 6
2.0 Review of
Related Literature. 6
2.1 Hibiscus sabdariffa. 6
2.2
Antibacterial Properties of Hibiscus Extracts. 8
2.3 Efficacy and
Limitations of Hibiscus Extracts. 11
2.4 Integrating
Hibiscus sabdariffa. 12
2.5. Potential
Applications and Research Gaps in Antibacterial Studies. 15
2.6 Empirical
Review.. 17
2.6 Theoretical
Framework. 19
CHAPTER THREE.. 21
3.0 Methodology. 21
3.1 Study Area. 21
3.2 Collection
and preparation of Plant extract 21
3.3.
Antibacterial activity testing. 21
3.4. MIC and MBC
determination. 22
3.5 Formulation
of natural remedies. 23
3.5.1 Hibiscus
Cream.. 23
3.5.2. Hibiscus
Ointment 23
3.6 Statistical
Analysis. 24
CHAPTER FOUR.. 25
RESULTS AND
DISCUSSION.. 25
4.1 Antioxidants
Activity. 25
4.2
Antibacterial Activity. 27
4.3 Discussion. 29
CHAPTER FIVE.. 31
SUMMARY,
CONCLUSION AND FUTURE RESEARCH RECOMMENDATIONS. 31
5.1 Summary. 31
5.2 Conclusion. 31
5.3 Future Research
Recommendations. 32
References. 33
The
Hibiscus genus comprises over 300 species of annual or perennial herbs, shrubs,
and trees, primarily found in warm temperate and tropical regions around the
world. These plants thrive in environments that provide ample sunlight and
moisture, and they are well-known for their large, showy flowers, which come in
a variety of colors and make them popular in ornamental gardening. Beyond their
aesthetic appeal, many species of hibiscus are cultivated for their practical
uses, including as fiber plants and for their edible parts.
Historically,
hibiscus plants have been utilized for a multitude of purposes. They are
commonly used to prepare both hot and cold beverages, with the dried calyces of
certain species, such as Hibiscus
sabdariffa, being particularly popular in herbal teas. These drinks are not
only refreshing but also believed to offer various health benefits. In the
culinary world, hibiscus is used as a flavoring agent in foods and beverages,
contributing a tart, cranberry-like flavor that enhances the overall taste
profile of many dishes. Furthermore, hibiscus extracts are traded as herbal
medicines, reflecting their long-standing role in traditional healing practices
(Da-Costa-Rocha et al., 2019).
The
rising global concern over antibiotic resistance has intensified the search for
new antibacterial substances. In this context, Hibiscus sabdariffa, commonly known as Roselle, has garnered
attention due to its antibacterial properties. Research indicates that the
methanolic extract of H. sabdariffa exhibits significant antibacterial effects
against a variety of harmful microorganisms, making it a promising candidate
for natural antibacterial agents. Notably, studies have demonstrated that the
methanolic extract of H. sabdariffa effectively inhibits the growth of several
pathogenic bacteria (Venkatesan et al.,
2024).
One study
assessed the effectiveness of H. sabdariffa against four bacterial strains:
Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Salmonella
typhi. The findings revealed that the extract significantly inhibited the
growth of all four strains, highlighting its potential as a natural
antibacterial agent (Alaga et al,
2024). Another investigation focused specifically on methicillin-resistant
Staphylococcus aureus (MRSA) clinical isolates, further confirming the
antibacterial efficacy of H. sabdariffa’s methanolic extract. Moreover,
the extract has shown promising results against multidrug-resistant Acinetobacter
baumannii, a common hospital-acquired infection (Jaddoa & Gharb, 2021).
Beyond
its medicinal uses, extracts from H. sabdariffa are also being explored
as natural preservatives in the food industry. For instance, they have been
successfully used in homemade tomato paste and pasteurized cow milk, where they
help to extend shelf life and maintain quality without the need for synthetic
additives. This application not only enhances food safety but also aligns with
the growing consumer demand for natural and organic food products.
In the
Caribbean, the roselle fruit is a staple ingredient used to create a refreshing
beverage, often enjoyed cold. This drink is not only popular for its taste but
is also believed to possess significant therapeutic benefits. It is commonly
used to treat gastrointestinal infections, diarrhea, and skin diseases,
showcasing the cultural importance of hibiscus in traditional medicine (Shruthi
& Ramachandra, 2019).
The
antibacterial effects associated with plant polyphenols, such as those found in
H. sabdariffa, are thought to stem from their ability to interfere with
bacterial cell membrane function. This interference hinders bacterial growth
and reproduction, making these compounds valuable in both medicinal and food
preservation contexts (Jagani et al.,
2019).
The
Hibiscus genus encompasses a wide variety of species that are not only
beautiful but also serve numerous practical purposes. From traditional
beverages to modern applications in food preservation and medicine, hibiscus
plants, particularly Hibiscus sabdariffa,
play a vital role in both cultural practices and health. As research continues
to uncover the potential of these plants, they may offer innovative solutions
to contemporary challenges such as antibiotic resistance and the demand for
natural food preservatives. The ongoing exploration of hibiscus’s properties
underscores its significance in both historical and modern contexts, making it
a fascinating subject for further study and appreciation.
The rise
of antibiotic-resistant microorganisms poses a significant threat to global
health, creating urgent challenges for public health systems and medical
practitioners worldwide. As bacteria evolve and develop resistance to commonly
used antibiotics, the effectiveness of these critical medications diminishes,
leading to increased morbidity and mortality from infections that were once
easily treatable (Prestinaci et al,
2019). The World Health Organization (WHO) has identified antibiotic resistance
as one of the top ten global health threats, prompting a critical need for
alternative antibacterial agents that can effectively combat resistant strains
of bacteria. In this context, Hibiscus
sabdariffa, commonly known as Roselle, emerges as a promising candidate for
further investigation (Mancuso et al,
2021). This plant has been utilized in traditional medicine systems across
various cultures for centuries, particularly in regions such as Africa, Asia,
and the Caribbean. Hibiscus sabdariffa
is renowned for its diverse applications, which include its use in herbal teas,
culinary dishes, and traditional remedies for various ailments. Notably, its
extracts are believed to possess significant antibacterial properties, which
may provide a viable solution to the growing problem of antibiotic resistance.
Despite
the historical and cultural significance of Hibiscus
sabdariffa in traditional medicine, the current understanding of its
antibacterial efficacy against a wide range of microorganisms remains limited.
While preliminary studies suggest that the methanolic extract of H. sabdariffa
exhibits antibacterial effects against several pathogenic bacteria,
comprehensive research is necessary to elucidate its full potential (Venkatesan
et al, 2024). There is a need to
systematically evaluate the spectrum of antibacterial activity of H. sabdariffa
against various strains of resistant microorganisms, including those that are
commonly implicated in hospital-acquired infections. Furthermore, the
mechanisms underlying the antibacterial properties of Hibiscus sabdariffa are not fully understood. It is crucial to
explore how the bioactive compounds present in the plant interact with
bacterial cells, potentially disrupting their growth or survival. Understanding
these mechanisms could pave the way for the development of new natural remedies
that harness the therapeutic potential of Hibiscus
sabdariffa in combating resistant infections. Addressing these knowledge
gaps is essential for establishing evidence-based guidelines for the use of Hibiscus sabdariffa in treating
infections caused by antibiotic-resistant microorganisms.
The aim
of this study is to evaluate the antibacterial properties of Hibiscus
sabdariffa extracts.
1.
To evaluate the antibacterial properties of Hibiscus sabdariffa extracts against
selected microorganisms.
2.
To determine the minimum inhibitory concentration
(MIC) and minimum bactericidal concentration (MBC) of the extracts.
This
study will contribute to the discovery of new antibacterial agents from natural
sources, providing alternative solutions to synthetic antibiotics. The findings
will also promote the use of Hibiscus
sabdariffa in traditional medicine and support the development of natural
remedies.
The
increasing prevalence of antibiotic-resistant microorganisms has highlighted
the urgent need for alternative antibacterial agents, prompting interest in
natural remedies such as Hibiscus
sabdariffa, which has been traditionally used for various medicinal
purposes, including infection treatment. Despite its promising potential, the
antibacterial properties of Hibiscus
sabdariffa extracts remain under-researched. Nonetheless, the development
of such natural antibacterial agents could play a significant role in enhancing
public health by offering viable alternatives to synthetic antibiotics.
This study evaluate the antibacterial properties
of Hibiscus sabdariffa extracts by
employing various extraction methods and testing their efficacy against
different bacterial strains.
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