







































 

 

 
1 

© 2024 Conscientia Beam. All Rights Reserved. 

Water extracts of pomegranate peel and hojicha tea leaf inhibit the growth of methicillin-
resistant staphylococcus aureus   

 

 

 Natsumi 
Nakamura1 

 Yusuke Komiya2+ 

 Hisaya K Ono3 

 Keizo Arihara4 

 

1,2,4Department of Animal Science, School of Veterinary Medicine, Kitasato 
University, Towada, Aomori 034-8628, Japan. 
1Email: ag107093@gmail.com  
2Email: komiya@vmas.kitasato-u.ac.jp  
4Email: arihara@vmas.kitasato-u.ac.jp  
3Department of Zoonoses, School of Veterinary Medicine, Kitasato University, 
Towada, Aomori 034-8628, Japan. 
3Email: hisaono@vmas.kitasato-u.ac.jp  

 
(+ Corresponding author) 

 ABSTRACT 
 
Article History 
Received: 24 November 2023 
Revised: 15 January 2024 
Accepted: 26 January 2024 
Published: 6 February 2024 
 

Keywords 
Antimicrobial 
Food waste products 
Hojicha 
Methicillin-resistant 
Staphylococcus aureus 
Pomegranate 
Staphylococcus aureus. 

 
Methicillin-resistant Staphylococcus aureus (MRSA) strains capable of causing infections 
and food poisoning have emerged worldwide in response to the use of various 
antimicrobial agents. To date, several drugs have been used to combat these bacteria. 
We focused herein on functional foods (particularly food waste products), which are 
safer and exhibit fewer side effects than drugs. The objective of present study is to 
elucidate the growth inhibitory effects of several food waste products on Staphylococcus 
aureus using three different Staphylococcus aureus strains, JCM2413 as the standard 
strain, and MW2 and N315 as MRSA strains. One percent water extracts of ten food 
waste products (grapefruit peel, pineapple leaf, dragon fruit peel, persimmon peel, 
turnip leaf, pomegranate peel, apple peel, potato peel, hojicha tea leaf, and banana peel) 
were added to the medium, and colonies were counted after a 24-hour incubation. 
Significant decreases were observed in MW2 and N315 colonies with pomegranate peel 
and hojicha tea leaf extracts. By contrast, no significant difference was observed in 
JCM2413 in any of the extracts. We demonstrated that water extracts of pomegranate 
peel and hojicha tea leaves possess bacteriostatic activity specific to MRSA. Our 
findings help to improve food safety with reducing food loss. However, further studies 
are needed to elucidate the detailed mechanism of the effects of pomegranate peel and 
hojicha tea on MRSA. 
 

Contribution/Originality: The originality of this study is to demonstrate the specific antibacterial activity of 

aqueous extracts from pomegranate peel and hojicha tea leaves against methicillin-resistant Staphylococcus aureus 

(MRSA). Our findings contribute to the improvement of food safety and the promotion of sustainable energy 

production through the utilization of food waste products. 

 

1. INTRODUCTION 

Staphylococcus aureus is a ubiquitous gram-positive bacterium, known worldwide to cause food-borne diseases, 

such as staphylococcal food poisoning (SFP), and a variety of infectious diseases ranging from skin infections to 

fatal systemic infections [1]. They secrete a variety of toxins and enzymes, including heat- and proteolysis-stable 

protein toxins (staphylococcal enterotoxins (SEs)) that underlie their pathogenicity [2]. New SEs continue to be 

identified, and SFP outbreaks are being reported worldwide, rendering SFP a continuing important public health 

and food safety issue [3]. 

Current Research in Agricultural Sciences 
2024 Vol. 11, No. 1, pp. 1-7 
ISSN(e): 2312-6418 
ISSN(p): 2313-3716 
DOI: 10.18488/cras.v11i1.3632 
© 2024 Conscientia Beam. All Rights Reserved. 

 
 
 

 
 
 
 

 

 
 
 
 

https://orcid.org/0009-0003-1852-5817
https://orcid.org/0000-0003-3225-2491
https://orcid.org/0000-0002-4581-6690
https://orcid.org/0000-0002-9035-3189
mailto:ag107093@gmail.com
mailto:komiya@vmas.kitasato-u.ac.jp
mailto:arihara@vmas.kitasato-u.ac.jp
mailto:hisaono@vmas.kitasato-u.ac.jp
https://www.doi.org/10.18488/cras.v11i1.3632


Current Research in Agricultural Sciences, 2024, 11(1): 1-7 

 

 
2 

© 2024 Conscientia Beam. All Rights Reserved. 

Methicillin-resistant Staphylococcus aureus (MRSA) has emerged worldwide in response to the use of various 

antimicrobial agents and is associated with poorer clinical outcomes than methicillin-susceptible Staphylococcus 

aureus (MSSA) [4, 5].  

The emergence of MRSA as a significant concern is evident as it has infiltrated the community and is no longer 

limited to being primarily a nosocomial pathogen [6, 7]. The increasing cases of vancomycin-resistant MRSA, 

antibiotic-resistant tuberculosis, and other bacterial infections highlight the extremely challenging scenario that 

humanity faces in combating bacterial infections. Consequently, collaborative efforts have been initiated to discover 

antimicrobial compounds from natural sources and traditional medicines. 

Antibiotics remain the method of choice for treating bacterial diseases; however, some food products, including 

garlic and ginger, display antibacterial activities. Bhatwalkar, et al. [8] reported that various compounds found in 

garlic exert antibacterial activity against a variety of bacteria, including MRSA [8]. Garlic organosulfur 

compounds, including diallyl sulfides and allicin, exert their antibacterial activity mainly by inactivating bacterial 

enzymes and altering the cell membrane. Ginger and its constituents also play a vital role in preventing microbial 

growth and act as antimicrobial agents [9]. Gingerol and shagelol have been identified as effective therapeutic 

agents. Although food functionality has attracted attention, food loss and waste have become growing problems in 

recent years. 

Sustainable Development Goals (SDGs) are a set of global goals for achieving sustainable health at every level, 

from the biosphere level to the local community. Addressing food loss and waste contributes to human health and 

ecosystems by reducing its negative impact on the environment. Approximately 1.3 billion and of food is wasted 

annually worldwide, and 6.12 million tons in Japan. In Japan, the Ministry of the Environment recommends 

innovations to enhance recycling and minimize food loss. These reports led us to wonder whether food waste 

products harbored effective anti-growth activity against Staphylococcus aureus. 

In this study, we aimed to investigate the functionality of food waste products against Staphylococcus aureus by 

examining the growth-inhibitory activity of water extracts obtained from ten food waste products on standard and 

methicillin-resistant strains of Staphylococcus aureus. 

 

2. MATERIALS AND METHODS 

2.1. Bacterial Strains and Growth Conditions 

We used JCM2413 as the standard Staphylococcus aureus strain, and MW2 and N315 as MRSA strains. Bacteria 

were cultured in Luria-Bertani (LB-Miller) Miller broth medium (Becton, Dickinson and Company, Franklin Lakes, 

NJ, USA) at 37 °C for 24 h with shaking. Bacteria were diluted (10-1 to 10-8) in trypto-soya broth (TSB) medium 

(Nissui Pharmaceutical Co., Tokyo, Japan). 

 

2.2. Preparation of Water Extracts from Food Waste Products 

Grapefruit, pineapple, dragon fruit, persimmon, turnip, pomegranate, apple, potato, hojicha, and banana peels 

were obtained for extraction. Each waste product was cut into small pieces, weighed, and homogenized in sterile 

water (4X each sample volume). Homogenized samples were centrifuged (4 °C, 4000 rpm, 30 min), supernatants 

were sterilized by filtration, and sterile extracts were stored until used at -20 °C. 

 



Current Research in Agricultural Sciences, 2024, 11(1): 1-7 

 

 
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© 2024 Conscientia Beam. All Rights Reserved. 

 
Figure 1. Schematic representation of the experimental design. Culture plates supplemented with each extract 
were separated into four sections, and each diluted bacteria (10-1 to 10-8) was seeded onto five arbitrary points 
per section (Gray dot). 

 

2.3. Experimental Procedures 

The study design is provided in Figure 1. Briefly, extract was added (to 1%) to nutrient agar medium (Nissui 

Pharmaceutical Co., Ltd.). Sterile water was used as control. Each plate was subdivided into four sections, and each 

diluted bacteria (10-1 to 10-8) was seeded at five arbitrary points per section. Colonies were counted after 24-hour 

incubation at 37 °C. 

 

2.4. Statistical Analysis 

Data are expressed as means ± standard error of the mean (SEM) and were analyzed using one-way analysis of 

variance followed by Tukey–Kramer multiple-comparison testing. Statistical significance was set at p < 0.05. 

Statistics were calculated using Excel-Toukei ver.7.0 (Social Survey Research Information Co., Ltd., Tokyo, Japan). 

 

3. RESULTS 

In the MW2 strain, a significant decrease in the number of colonies was observed compared to the control 

group with exposure to pomegranate peel and hojicha tea leaf at 10-3, 10-4, and 10-5 bacterial dilutions Figure 2A 

and Table 1). At bacterial concentrations of 10-1 and 10-2, colony numbers were uncountably large. At bacterial 

concentrations of 10-3 and 10-4, supplementation with grapefruit peel, pineapple leaf, dragon fruit peel, persimmon 

peel, and apple peel tended to increase colony numbers compared to controls. 

 

 

 
Figure 2. Images of MW2 (A) and N315 (B) colonies after 24-hour incubation at 37 ℃ in control, 
pomegranate peel, and hojicha tea leaf groups. Controls for hojicha tea leaf and pomegramate peel 
assessments were conducted independently in the N315 strain. 

 



Current Research in Agricultural Sciences, 2024, 11(1): 1-7 

 

 
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© 2024 Conscientia Beam. All Rights Reserved. 

Table 1. The number of colonies of MW2. 

Food samples Dilution rate of MW2 

10-1 10-2 10-3 10-4 10-5 10-6 10-7 10-8 

Control - - 124.8±11.0 19.6±3.5 2.4±0.51 0.40±0.40 0.0 0.0 
Grapefruit peel - - 148.0±10.7 23.0±1.8 2.0±0.70 0.40±0.40 0.0 0.0 
Pineapple peel - - 152.4±10.1 25.6±1.6 1.4±0.40 0.60±0.60 0.0 0.0 
Dragon fruit peel - - 148.0±14.2 22.6±0.75 2.4±0.81 0.20±0.20 0.0 0.0 
Persimmon peel - - 132.6±7.9 27.2±1.7 1.0±0.63 0.0 0.0 0.0 
Turnip leaf - - - 32.6±4.3 1.8±0.37 0.40±0.40 0.0 0.0 
Pomegranate peel - - 0.0** 0.0** 0.0* 0.0 0.0 0.0 
Apple peel - - 119.8±4.3 21.6±3.7 1.6±0.60 0.20±0.20 0.0 0.0 
Potato peel - - 100.0±6.3 20.8±1.8 1.2±0.20 1.0±0.31 0.20±0.20 0.0 
Hojicha tea leaf - - 79.2±6.1* 6.2±1.0* 0.20±0.20 0.20±0.20 0.0 0.0 
Banana peel - - 109.4±3.9 11.2±0.86 0.60±0.40 0.20±0.20 0.20±0.20 0.0 

Note:  Results are presented as mean ± SEM (**P < 0.01, *P < 0.05 vs control). 

 

A significant decrease in N315 colony numbers relative to the control was observed with exposure to 

pomegranate peel and hojicha tea leaf extracts at 10-4 bacteria concentrations (Figure 2B and Table 2). Although 

statistical analyses were not conducted due to the large number of control group colonies, few colonies were 

obtained in the pomegranate peel group at 10-1 to 10-3 bacteria concentrations. Grapefruit peel, pineapple leaf, 

dragon fruit peel, persimmon peel, and stock leaf extracts tended to increase colony numbers compared with the 

control. 

 

Table 2. The number of colonies of N315. 

Food samples Dilution rate of N315 

10-1 10-2 10-3 10-4 10-5 10-6 10-7 10-8 

Control 1 - - - 29.8±2.2 3.6±0.60 0.0 0.0 0.0 
Grapefruit peel - - - 40.6±3.3 3.8±1.5 0.40±0.24 0.0 0.0 
Pineapple peel - - - 32.2±1.5 4.0±0.90 0.60±0.40 0.0 0.0 
Dragon fruit peel - - - 36.2±2.7 3.4±0.87 0.40±0.24 0.20±0.20 0.0 
Persimmon peel - - - 38.0±2.1 4.2±0.58 0.60±0.24 0.20±0.20 0.0 
Turnip leaf - - - 45.4±2.9 7.6±0.87 0.80±0.49 0.0 0.0 
Pomegranate peel 0.0 0.0 0.0 0.0** 0.0 0.0 0.0 0.0 
Control 2 - - - 40.4±2.2 3.2±0.73 0.40±0.24 0.0 0.0 
Apple peel - - - 43.6±2.2 4.4±0.40 0.60±0.40 0.0 0.0 
Potato peel - - - 56.2±5.2 5.8±1.0 0.60±0.24 0.20±0.20 0.0 
Hojicha tea leaf - - 75.0±5.9 9.4±1.0** 0.40±0.24 0.0 0.0 0.0 
Banana peel - - - 41.8±2.3 4.6±1.0 0.0 0.0 0.0 
Note:  There were two controls (Control 1 and 2) because of independent experiment. Results are presented as mean ± SEM (**P < 0.01 vs control). 

 

No significant differences were observed between extract and control treated JCM2413 strains (Table 3). 

 

Table 3. The number of colonies of JCM2413. 

Food samples Dilution rate of JCM2413 

10-1 10-2 10-3 10-4 10-5 10-6 10-7 10-8 

Control - - 121.3±32.4 8.6±1.2 0.6±0.24 0.0 0.0 0.0 
Grapefruit peel - - - 3.4±0.68 0.20±0.20 0.0 0.0 0.0 
Pineapple peel - - - 12.2±1.5 1.0±0.45 0.0 0.0 0.0 
Dragon fruit peel - - - 17.0±4.3 1.0±0.32 0.40±0.24 0.0 0.0 
Persimmon peel - - - 10.0±1.5 0.40±0.24 0.0 0.0 0.0 
Turnip leaf - - - 11.4±1.5 5.2±4.0 0.0 0.0 0.0 
Pomegranate peel - - 95.0±33.3 5.6±5.6 0.0 0.0 0.0 0.0 
Apple peel - - - 38.4±23.9 0.60±0.24 0.0 0.0 0.0 
Potato peel - - 106.0±12.7 12.6±1.5 1.4±0.51 0.80±0.37 0.0 0.0 
Hojicha tea leaf - - 73.2±3.7 10.8±0.73 0.60±0.24 0.0 0.0 0.0 
Banana peel - - - 10.0±1.3 1.4±0.68 0.0 0.20±0.20 0.0 

Note:  Results are presented as mean ± SEM. 



Current Research in Agricultural Sciences, 2024, 11(1): 1-7 

 

 
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© 2024 Conscientia Beam. All Rights Reserved. 

4. DISCUSSION 

This study revealed that aqueous extracts of pomegranate peel and hojicha tea leaves possess bacteriostatic 

activity specific to methicillin resistant Staphylococcus aureus strains. 

Hojicha is a traditional Japanese tea made by roasting green tea leaves. Zhao et al. reported that green tea 

extracts possess antibacterial effects against Staphylococcus aureus [10]. Epigallocatechin gallate (EGCg), the major 

constituent of tea catechins, shows potent bactericidal activity against both MRSA and MSSA. EGCg not only 

suppressed the growth of both MRSA and MSSA, but also significantly reduced their resistance to increased ionic 

strength and decreased osmotic pressure in the surrounding environment. It's important to note that this effect is 

not exclusive to MRSA.  

Our results showed that the effect of hojicha tea leaf extract was specific to MRSA strains, and specific 

components of hojicha tea leaves not included in green tea may contribute to this effect. The antibacterial activity of 

green tea are altered by heat treatment, and it has been suggested that the antibacterial elements generated in 

green tea infusion during heating consist of low monomer polymers of catechin [11]. Therefore, the functional 

components of hojicha tea leaves may be specific components produced by further heat treatment. 

Pomegranate (Punica granatum), one of the oldest known fruits, belongs to the Lythraceae family. It is believed 

to have originated in Persia, and several varieties are cultivated. At present, pomegranates are grown in many 

Middle Eastern, Asian, European, and Western countries, including the United States of America. Pomegranate 

peel extract contains abundant polyphenols, flavonoids, and tannins.  

Feng et al. [12] reported that polyphenols and tannins correlate positively with antibacterial strength against 

Staphylococcus aureus, while tannins alone contribute to MRSA inhibition, implying a crucial role for tannins in 

suppressing bacteria [12]. Unfortunately, pomegranate peels contain toxic substances, such as pelletierine, an 

alkaloid that is harmful to the body. Therefore, its use as an antimicrobial substance in food products would be 

limited without purification of the antimicrobial components. Interestingly, a green synthesis of selenium 

nanoparticles using pomegranate peel extract showed promising antimicrobial activities against several bacteria, 

including Staphylococcus aureus, with low cytotoxicity in normal human cell lines [13].  

Continued research is expected to lead to enhanced mechanistic understanding and development of 

technologies allowing production of food-derived antimicrobial products with fewer side effects. 

Bacteria evolve various mechanisms to survive exposure to antimicrobial agents. For example, they prevent the 

influx of drugs by changing the composition of their outer membranes, pump out toxins that have entered the 

bacteria (efflux pump), change the antimicrobial's point of action (DNA or RNA mutation), enzymatically degrade 

the antimicrobial (e.g. use of β-lactamase), form biofilms, etc. The reason significant reduction in colony numbers 

was only observed in MRSA is that hojicha tea leaf and pomegranate peel extracts inhibited the function of MRSA-

specific proteins and genes such as penicillin-binding protein (PBP) and β-lactamase, which are absent in standard 

Staphylococcus aureus [14, 15]. 

A limitation of this study was that the mechanism of antibacterial activity of hojicha tea leaf and pomegranate 

peel extracts was not investigated. We revealed that the effects of these extracts were specific to MRSA strains. 

However, their functional components and pathways remain undetermined. Further studies are required to clarify 

the detailed mechanisms underlying the antibacterial activity of hojicha tea leaf and pomegranate peel extracts 

against MRSA. 

 

5. CONCLUSION 

We revealed that water extracts from pomegranate peel and hojicha tea leaves exhibit specific antigrowth 

activity against MRSA.  

 



Current Research in Agricultural Sciences, 2024, 11(1): 1-7 

 

 
6 

© 2024 Conscientia Beam. All Rights Reserved. 

Our findings contribute to improving food safety with reducing food loss; however, further studies are required 

to elucidate the detailed mechanism underlying the effects of pomegranate peel and hojicha tea leaves on MRSA. 

 

Funding: This study received no specific financial support.    
Institutional Review Board Statement: Not applicable. 
Transparency: The authors state that the manuscript is honest, truthful, and transparent, that no key 
aspects of the investigation have been omitted, and that any differences from the study as planned have been 
clarified. This study followed all writing ethics. 
Competing Interests: The authors declare that they have no competing interests. 
Authors’ Contributions: Conceptualization, data curation, formal analysis, funding acquisition, 
investigation, writing—original draft, N.N.; conceptualization, data curation, formal analysis, funding 
acquisition, investigation, project administration, supervision, visualization, writing—original draft, 
writing—review & editing, Y.K.; conceptualization, resources, methodology, supervision, writing—review & 
editing, H.K.O.; resources, supervision, writing—review & editing, K.A. All authors have read and agreed to 
the published version of the manuscript. 

 

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