Pomelo Peel Research Articles

A Novel Ethanolic Two-Phase System Based on Deep Eutectic Solvents and Amphiphilic Copolymer for the Extraction of Neohesperidin and Naringin from the Pomelo Peel.

A novel ethanolic two-phase system (ETPS) composed of Pluronic®L-64 (PL 64) and deep eutectic solvents (DESs) was constructed for the separation of two similar flavonoids of naringin (Nar) and neohesperidin (Neo) from the pomelo peel. The selectivity (S) data showed that DES prepared from tetrabutylammonium bromide (N4444Br) and glycerol (Gly) had the optimal distribution efficiency for Nar and Neo standards. A binodal curve of N4444Br-Gly/PL 64/ethanol system fitted to the nonlinear Merchuk relationship showed that the biphasic region was narrow for ETPS. The influences of the mass ratio of DESs and PL 64, DES concentration, PL 64 concentration, molar ratio of DESs, temperature, phosphate buffer solution, and ethanolic pH were studied in single-factor experiments. Under the optimal conditions, the maximum extraction efficiency (ENar = 68.32%, ENeo = 86.09%), partition coefficient (KNar = 6.66, KNeo = 19.13), and S (2.88) were obtained in the DESs-rich (bottom) phase. N4444Br-Gly, Nar, and Neo with recovery yields of 78.12%, 66.61%, and 68.03%, respectively, had been recovered using D101 macroporous resin. This proposed ETPS is efficient and environmentally friendly and is expected to avail meaningful references for the separation of natural products with similar structures.

Citrus peel waste essential oil: Chemical composition along with anti‐amylase and anti‐glucosidase potential

SummaryThe most common waste in citrus processing is their skin, which contains high amounts of essential oil. The antioxidant, anti‐glucosidase, and anti‐amylase properties of essential oils extracted from fresh bitter orange, lime, lemon, pomelo, grapefruit, mandarin, and sweet orange peels were examined. Linalool (18.26%–29.08%), limonene (17.08%–22.44%), linalool acetate (17.17%–30.47%), α‐terpineol (6.08%–11.06%), geraniol (2.05%–6.30%), β‐ocimene (1.52%–5.02%), nerolidol (2.93%–4.00%), β‐pinene (2.71%–3.29%), farnesol (2.08%–2.97%), and geranyl acetate (1.89%–2.80%) were found to be the primary components of citrus peel essential oil. Citrus peel essential oil displayed a good antioxidant capacity ranging from 375 to 643 mg Trolox equivalent/g. Citrus peel essential oils strongly inhibit amylase (520 to 738 mg acarbose equivalent/g) and glucosidase (475 to 780 mg acarbose equivalent/g). According to kinetic analysis, fluorescence quenching, and ultraviolet absorption, citrus peel essential oils inhibit amylase and glucosidase with a mixed competitive, non‐competitive, and uncompetitive manner. Some citrus varieties have long been used to treat diabetes and obesity. While citrus fruits are consumed worldwide, the citrus peel is typically discarded; hence, using the citrus peel in the culinary and medical industries might have a positive economic impact on managing diabetes.

Optimization of Pb(II) Metal Adsorption on Pomelo Peel Biosorbent by Immobilization in Ca-Alginate

Industrial wastewater is a source of water pollution that dominates today. Wastewater is known to cause damage to the environment, health and threatens the availability of clean water. Industrial wastewater is a problem because it contains a lot of dangerous heavy metals, one of which is Lead or Pb(II).' Adsorption technology has become one of the most exciting technologies because of its good performance. Adsorption media currently popular for the study is adsorption using agricultural waste. One of the agricultural wastes that can be used as biosorbent is grapefruit peel (Citrus maxima). The functional groups in grapefruit peel are ether, pedophilic, carboxyl, carbonyl, and hydroxyl. These functional groups are essential in binding heavy metals from the aquatic environment. In this study, grapefruit peel was modified into a Ca-alginate immobilized biosorbent. The analyzes that will be carried out include the characteristics of the biosorbent, namely the water content and ash content test, the FTIR test to determine the functional groups contained in the biosorbent, the SEM-EDX test to assess the appearance of the biosorbent, as well as analysis of the initial and final levels of Pb(II). Based on the results obtained, the best percentage decrease in Pb(II) levels was obtained with operating conditions of pH 4.7, contact time of 90 minutes, and Pb(II) concentration of 100 mg/L with a percentage decrease in Pb(II) levels of 89%.

Optimization of Pb(II) Metal Adsorption on Pomelo Peel Biosorbent by Immobilization in Ca-Alginate

Industrial wastewater is a source of water pollution that dominates today. Wastewater is known to cause damage to the environment, health and threatens the availability of clean water. Industrial wastewater is a problem because it contains a lot of dangerous heavy metals, one of which is Lead or Pb(II).' Adsorption technology has become one of the most exciting technologies because of its good performance. Adsorption media currently popular for the study is adsorption using agricultural waste. One of the agricultural wastes that can be used as biosorbent is grapefruit peel (Citrus maxima). The functional groups in grapefruit peel are ether, pedophilic, carboxyl, carbonyl, and hydroxyl. These functional groups are essential in binding heavy metals from the aquatic environment. In this study, grapefruit peel was modified into a Ca-alginate immobilized biosorbent. The analyzes that will be carried out include the characteristics of the biosorbent, namely the water content and ash content test, the FTIR test to determine the functional groups contained in the biosorbent, the SEM-EDX test to assess the appearance of the biosorbent, as well as analysis of the initial and final levels of Pb(II). Based on the results obtained, the best percentage decrease in Pb(II) levels was obtained with operating conditions of pH 4.7, contact time of 90 minutes, and Pb(II) concentration of 100 mg/L with a percentage decrease in Pb(II) levels of 89%.

Co3O4/C-PC composite derived from pomelo peel-loaded ZIF-67 for activating peroxymonosulfate (PMS) to degrade ciprofloxacin

Metal–organic frameworks (MOFs) derived metal oxides/carbon catalysts have attracted a lot of attention in the field of environmental remediation, but the agglomeration of MOFs derived metal oxides remains a challenge. Herein, low-cost and readily accessible pomelo peel (PP) was chosen as a high-quality carrier for MOFs (ZIF-67). In situ growth of ZIF-67 on PP cores was followed by one-step pyrolysis of the PP/ZIF-67 material to yield the derivative composite material (Co3O4/C-PC). The degradation of CIP in water by Co3O4/C-PC activated peroxymonosulfate (PMS) was investigated. The results reveal that the CIP degradation efficiency in the Co3O4/C-PC/PMS system can reach 93.3 %, and the system has good durability and anti-interference ability, and can be applied to a wide pH range of 5–11. The effects of various experimental parameters were investigated. The radical pathway (SO4− and OH) and the nonradical pathway (1O2) both contributed to the degradation of CIP. This work proposes new ideas for the preparation of low-cost biomass/MOFs derived catalysts for the application of water treatment.

Double recovery and regeneration of Pt/C catalysts: Both platinum from the spent proton exchange membrane fuel cell stacks and carbon from the pomelo peel

A novel double-recycling engineering for the regeneration of Pt/C graphitized hollow nanosphere catalysts was proposed for the first time. After recycling Pt from waste proton exchange membrane fuel cell stacks (PEMFC) as a platinum source and recycling waste pomelo peel as a carbon source, Pt/C catalysts were regenerated by polyol reduction, which was useful for sustainable energy development. The recovery efficiency of Pt reaches 96.4 ± 0.2%. The graphitized hollow nanospheres were synthesized by investigating critical factors by adjusting: 1) pyrolysis temperature and 2) treatment method. The graphitized hollow nanosphere material from the waste pomelo peel was prepared by an improved method at 1000 °C (denoted as PP-2–1000). The recovered Pt was combined with PP-2–1000 and commercial carbon (CC) to make Pt/PP-2–1000 and Pt/CC catalysts, respectively. The electrochemical active surface area (ECSA) of Pt/PP-2–1000 is equivalent to that of Pt/CC. For oxygen-reduction reaction (ORR), the mass activity (im at 0.9 V) of Pt/PP-2–1000 is 2.98 times higher than that of Pt/CC. After the accelerated durability test (ADT), the ECSA's remaining efficiency of Pt/PP-2–1000 is 10.1% higher than that of Pt/CC. It proves that the recovered Pt/PP-2–1000 has excellent stability and electrochemical performance. The research may have a profound impact on the sustainable development of PEMFC and biomass-related industries.

Arsenic removal by pomelo peel biochar coated with iron

Arsenic present in drinking water is a serious concern due to its high toxicity. In this study, pomelo peel biochar coated with iron (PPCI) through slow pyrolysis carbonization and iron-coating processes was investigated for its ability to remove arsenite As(III) and arsenate As(V). The maximum adsorption capacity of As(III) and As(V) on PPCI at pH = 7 determined by the Langmuir model was11.77 mg/g and 15.28 mg/g, respectively. The PPCI’s adsorption capacity was much higher than that of raw pomelo peel (PP) (0.033 mg/g and 0.034 mg/g for As(III) and As(V), respectively) and many other biomass-derived adsorbents reported in the literature. The change of solution pH (2.0–10 range) did not significantly affect the PPCI’s adsorption capacity to As(III) or As(V) ions. In contrast, the presence of co-existing anions caused differential reductions in As removal efficiency (the effecting order: Cl–<SO42–<CO32–<SiO32–<HPO42–). The characterization of PPCI (morphological, textural, surface functionality, and surface charge properties) before and after adsorption was conducted. Results showed that adsorption mechanisms were reaction between Fe and As in the PPCI’s surface, inner-sphere complexation for As(V) and As(III) ), and electrostatic attraction for As(V). PPCI is simply synthesized from abundant pomelo waste products and can be used for efficiently removing the two forms of toxic As ions from water.

Separation of Cesium Using Magnetic Copper Hexacyanoferrate/Biochar/Fe3O4

AbstractIn this study, a novel cesium scavenger, magnetic copper hexacyanoferrate (III)/pomelo peel biochar (CuHCF‐MPC), is prepared. CuHCF‐MPC exhibits remarkable Cs+ adsorption properties including rapid kinetics, stability over a wide pH range (pH ≈3–10), high cesium adsorption capacity (145.65 mg g−1 at pH 7), high removal efficiency (&gt;90%) and high Kd value (49 000 mL g−1) even in the presence of competitive cations (K+, Na+, Mg2+, and Ca2+) at high concentration. The kinetic behavior of cesium adsorption onto CuHCF‐MPC can be elucidated with the pseudo‐second‐order kinetic model. The adsorption is classified as an endothermic and spontaneous process as proved by ΔH &lt; 0, ΔG &lt; 0. The positive results suggest CuHCF‐MPC is an economic, environment‐friendly, and promising task‐specific adsorbent of cesium.

Mechanical compressive behavior of pomelo peel and multilayer polymeric film/foam systems

The study of natural cellular materials offers valuable insights into the superior properties and functions underlying their unique structure and benefits the design and fabrication of advanced biomimetic materials. In this study, we present a systematic investigation of the mechanical behavior of fresh and oven-dried pomelo peels. Density measurements revealed the gradient structure of the pomelo peel, which contributed to its mechanical properties. Step-by-step drying revealed two types of water in the peel. Both uniaxial compression and low-strain hysteresis tests were conducted, and the results showed that fresh pomelo peel exhibits soft elastomer-like behavior, while dried pomelo peel behaves more like conventional synthetic polymer foam. Compared to fresh pomelo peel, dried peel samples showed higher compressive modulus and energy loss in 6, 8 and 10% strain hysteresis tests. The rehydration process was studied using hysteresis tests at three different strains. In addition, multilayer gradient EO/EO and LDPE/LDPE film/foams with 16 alternating layers were produced using the microlayer coextrusion technique. The morphology and mechanical properties were examined and indicated great potential for biomimicking the structure and properties of pomelo peel.

A sustainable and low-cost route to prepare magnetic particle-embedded ultra-thin carbon nanosheets with broadband microwave absorption from biowastes

Two-dimensional (2D) carbon nanomaterials have attracted extensive attention in the field of microwave absorption (MA) owing to their unique layered structure, tailorable atomic layer, tunable active surface, and high dielectric loss. Here, novel porous graphene-like heterostructures are facilely prepared through the carbonization of pomelo peel (PP)/prussian blue (PB) and PP/PB analogues (PBA). The magnetic particles derived from PB and PBA are uniformly distributed in the N-doped carbon (NC) ultra-thin nanosheets, which enhances the magnetic loss and improves the interfacial polarization. The optimized Fe/ZnO/NC-7 sample exhibits a maximum reflection loss (RLmax) of −58.12 dB at 2.05 mm, and an ultrabroad effective bandwidth (RL ≤ −10 dB) of 7.6 GHz is achieved at 1.9 mm, which covers nearly half of the measured frequency range. The superior MA performance of Fe/ZnO/NC-7 composite is ascribed to the unique magnetic particle-embedded carbon nanosheet, which not only optimizes the impedance matching but also enhances the electromagnetic wave (EMW) attenuation ability through 2D conductive networks and multiple polarization processes. Overall, this work offers an environmentally friendly method to prepare low-cost and high-performance microwave absorbers from biowastes, which exhibit superior application potential as compared to other 2D microwave absorbers including graphene and MXene.

Green production of a yellow laccase by Coriolopsis gallica for phenolic pollutants removal

As a group of green biocatalysts, fungal laccases have aroused great interest in diverse biotechnological fields. Therein, yellow laccase has advantages over blue laccase in catalytic performance, but it is not common in the reported fungal laccases. Here, we report a yellow laccase from white-rot fungus Coriolopsis gallica NCULAC F1 about its production, purification, characterization, and application. Laccase production in the co-fermentation of pomelo peel and wheat bran reached the enzyme activity by 10,690 U/L after 5 days with a 13.58-time increase. After three steps of purification, laccase increased the specific activity from 30.78 to 188.79 U/mg protein with an activity recovery of 45.64%. The purified C. gallica laccase (CGLac) showed a molecular mass of about 57 kDa. CGLac had a yellow color and no absorption peaks at 610 nm and 330 nm, suggesting that it’s a yellow laccase. CGLac exhibited stability towards temperature (40–60 °C) and neutral pH (6.0–8.0). Fe3+ and Mn2+ strongly stimulated CGLac activity by 162.56% and 226.05%, respectively. CGLac remained high activities when exposed to organic reagents and putative inhibitors. Additionally, CGLac contributed to 90.78%, 93.26%, and 99.66% removal of phenol, p-chlorophenol and bisphenol A after 120 min, respectively. In conclusion, a green efficient production strategy was introduced for fungal laccase, and the obtained CGLac presented great enzymatic properties and catalytic potential in the removal of phenolic pollutants.

Chemical composition, structural and functional properties of insoluble dietary fiber obtained from the Shatian pomelo peel sponge layer using different modification methods

In order to improve the function of Shatian pomelo sponge layer insoluble dietary fiber (IDF), it was modified by high hydrostatic pressure (HHP, 400 MPa, 15 min), cellulose hydrolysis (CH, 0.4% cellulase, 70 min) and alkaline hydrolysis (AH, 1.4% sodium hydroxide solution, 20 min), respectively. Compared with the unmodified IDF, the molecular weight and particle size of the three modified IDFs were both decreased, while their void structure was increased. Specifically, the IDF treated with AH resulted in the smallest particle size (60.63 μm) and a honeycomb-like void structure, which explained why AH-treated IDF showed the strongest glucose and cholesterol adsorption capacities in vitro. The contents of rhamnose, xylose, galactose and galacturonic acid in IDF were significantly increased after HHP treatment (H-IDF). Moreover, H-IDF and CH-treated IDF (C-IDF) exhibited similar capacities for oil-holding and cation-exchange. H-IDF presented the strongest swelling capacity and excellent capacity for cholesterol adsorption. Thus, HHP modified Shatian pomelo peel sponge layer IDF can not only improve the utilization of by-products, but also has potential application value as a novel ingredient in hypolipidemic and hypoglycemic foods products.

The Preparation of the Essential Oil from Pomelo (Citrus maxima ‘Shatian Yu’) Peel Using Microwave-Assisted Distillation by Pectinase Soaking and Its Anti-Fungal Activity

To verify the anti-fungus properties of the crop-harmful pseudocercospora, the essential oil (EO) of pomelo peel (PP) was extracted by a single factor combined with response surface optimization. Meanwhile, the composition and activity of EO were studied. The PP was squeezed by a screw extruder and pretreatmented by pectinase, then extracted by microwave-assisted steam distillation. The optimal conditions were as follows: pectinase dosage was 69.17 μmol/g, microwave power was 651.42 W and extraction time was 43.84 min. The dry weight (DW) yield of PPEO reached 14.63 mL/kg DW after BBD optimization. There were 23 compounds in the PPEO identified by GC-MS. Limonene, α-phrenbutene, and laurene in PPEO accounted for 79.31%, 4.72%, and 3.46%, respectively. In addition, the antifungal was effective when the concentration of PPEO was 3.5 mg/mL. Therefore, this study has guiding significance for the development of natural resources.

Carbon Quantum Dots from Pomelo Peel as Fluorescence Probes for "Turn-Off-On" High-Sensitivity Detection of Fe3+ and L-Cysteine.

This study designed a “turn-off–on” fluorescence analysis method based on carbon quantum dots (CQDs) to detect metal ions and amino acids in real sample systems. CQDs were derived from green pomelo peel via a one-step hydrothermal process. The co-doped CQDs with N and S atoms imparted excellent optical properties (quantum yield = 17.31%). The prepared CQDs could be used as fluorescent “turn-off” probes to detect Fe3+ with a limit of detection of 0.086 µM, a linear detection range of 0.1–160 µM, and recovery of 83.47–106.53% in water samples. The quenched CQD fluorescence could be turned on after adding L-cysteine (L-Cys), which allowed detection of L-Cys with a detection limit of 0.34 µM and linear range of 0.4–85 µM. Recovery of L-Cys in amino acid beverage was 87.08–122.74%. Visual paper-based testing strips and cellulose/CQDs composite hydrogels could be also used to detect Fe3+ and L-Cys.

A novel approach simultaneously imparting well-hydrophobicity and photothermal conversion effect to polymer materials: solar-promoted absorption of organic solvents and oils

In this work, a series of polymer materials including pomelo peel, cotton fabric, polyurethane foam, and so on, are treated by heated CH3SiCl3, presenting desirable photo-thermal conversion function and hydrophobicity. As a representative material, the surface element and skeleton morphology of pomelo peel foam treated by CH3SiCl3 are analyzed detailedly. It is found that well-hydrophobicity (water contact angle of ~147°) and photo-thermal conversion performance (~91.2 °C under one sun) are attributed to the surface carbonization reaction and formation of CH3-SiO2 nanoparticles. Meanwhile, the treatment of CH3SiCl3 significantly increases the BET surface area to 3.0635 m²/g from 0.0973 m²/g. Therefore, pomelo peel-derived carbon foam presents a desirable adsorption capacity of organic solvents and oils (up to 43.2 times its original weight) and excellent removal efficiency (>99.0%). In addition, the rapid photo-thermal response (achieve ~73 °C at 40 s) and high equilibrium temperature (~91.2 °C) are als° demonstrated in pomelo peel-derived carbon foam. As a result, the absorption rate of highly-viscous oils is effectively promoted by the higher fluidity and capillary action caused by the solar-promoted mechanism. This study offers a scalable, easily operated, and environmentally friendly approach to prepare hydrophobic and photo-thermal materials, thus demonstrating a huge potential in oil/water separation application.

Utilization of peel of white pomelo for the development of pectin based biodegradable composite films blended with casein and egg albumen

Biodegradable composite films were developed using casting method from white pomelo peel pectin, casein and egg albumin at different proportions. The pectin was incorporated to modify the properties of films and the effect of pectin incorporation on various properties of films was investigated. In comparison to other edible films, the composite films prepared from white pomelo peel pectin, casein protein and egg albumin protein at a ratio of 50:50:0 (F4) and 50:25:25 (F7) possessed highest tensile strength and lowest water vapour permeability. The X-Ray diffraction (XRD) analysis of composite films indicated that the major portion of the film was amorphous. Fourier Transform Infrared Spectroscopy (FTIR) analysis of composite films indicated the increase in the intermolecular interactions of polymers resulting in increase in compactness of film matrix. The curves obtained by Differential Scanning Calorimetry (DSC) indicated that addition of pectin into casein and egg albumin increased the melting temperature and the peak temperature, indicating increased thermal stability of composite films.

Comparative study of pomelo‐peel‐derived hydrochar and torrefied poultry‐litter on coal fuel blends: Combustibility, synergy factor, and ash analysis

AbstractCo‐firing is considered to be a promising approach for the reduction of CO2 emissions from coal‐fired plants. However, the utilization of fruit‐waste‐based feedstocks is less common than the use of animal‐waste feedstocks, which are usually accompanied by high toxic ash content and low combustibility. In this work, pomelo‐peel‐derived hydrochar (PPHC), characterized by excellent fuel properties and combustibility, was systematically compared with torrefied poultry litter (PLBC), to promote its use as an eco‐friendly solid fuel. The two bio‐based solid fuels were prepared using hydrothermal carbonization (180–240 °C) and torrefaction (220–310 °C), respectively. Elemental analysis, proximate analysis, scanning electron microscopy, Brunauer–Emmett–Teller (BET) analysis, and Fourier‐transform infrared (FTIR) spectroscopy were used to study the physicochemical and structural properties of the prepared chars. The combustion behavior and post‐combustion ash content of PPHC/coal and PLBC/coal blends were assessed by thermogravimetric analysis (TGA) and X‐ray fluorescence (XRF). Fuel blends of PPHC and coal showed superior combustibility (S = 5.77–14.79 × 10−12), stronger synergistic effects (1.48–3.19°C−3 min−1/2), and lower activation energy requirements (28.5–31.6 kJ mol−1), in comparison with PLBC/coal blends. Comparative analysis of heavy metal content revealed that PPHC/coal blends were characterized by less toxicity, with lower concentrations of Fe, Mn, Zn, Cu, As, and Co. Hence, the results demonstrated that pomelo peel hydrochar, with excellent combustibility and environmental friendliness, could serve as a better alternative for co‐firing with coal. Meanwhile, torrefied poultry litter showed undesirable ash properties, suggesting an urgent need for the development of alternative methods for its treatment. © 2022 Society of Chemical Industry and John Wiley &amp; Sons, Ltd.

Promoting Effect of Pectic-Oligosaccharides Produced from Pomelo Peel on Rice Seed Germination and Early Seedling Growth

Promoting Effect of Pectic-Oligosaccharides Produced from Pomelo Peel on Rice Seed Germination and Early Seedling Growth

Sustainable Synthesis of Carbon Quantum Dots with Tailored Surface Functional Groups from Pomelo Peel Waste for Inhibiting Scale

AbstractFruit Shatian pomelo peel is a common solid biological waste. This article reports the environmentally friendly synthesis of carbon quantum dots from Shatian pomelo peel waste by hydrothermal method. The synthesized carbon quantum dots (named PCA‐CQDs) were characterized by transmission electron microscope (TEM), Fourier transform infrared (FT‐IR) spectroscopy, X‐ray photoelectron spectroscopy (XPS), ultraviolet‐visible spectroscopy (UV‐vis) and excitation‐dependent fluorescence emission spectroscopy. The resultant carbon quantum dots were spherical, and the average particle diameter was measured to be 5 nm. The surface of PCA‐CQDs has been successfully modified with functional oxygen‐containing functional groups such as hydroxyl and carboxyl groups. Therefore, PCA‐CQDs exhibit excellent water solubility and calcium ion chelating properties. Most importantly, PCA‐CQDs were used as a new type of green scale inhibitor for inhibiting the CaSO4 and CaCO3 scale for the first time, and the scale inhibition efficiency can reach more than 95 %. By observing the changes of the scale crystals in the SEM image, it is speculated that the mechanism of PCA‐CQDs inhibiting calcium scale may include chelation, dispersion and lattice distortion.

Analysis of the chemical components of pomelo peels (Citrus grandis [L.] Osbeck) from different cultivars by using supercritical CO2 fluid extraction and ultra-high-performance liquid chromatography-tandem mass spectrometry.

Five pomelo cultivars (i.e., Citrus grandis cv. Shatianyou, Citrus grandis cv. Guanximiyou, Citrus grandis cv. Yuhuanyou, Citrus grandis cv. Duweiwendanyou and Citrus grandis cv. Liangpingyou) from different origins in China were selected to analyze their components by using supercritical CO2 fluid extraction coupled with ultra-high-performance liquid chromatography-tandem mass spectrometry. A total of 45 compounds were identified in the supercritical CO2 fluid extracts of the pomelo peels from the five cultivars. These compounds included eight flavonoids, 18 coumarins, four organic acids, three aldehydes, and 12 other compounds, which were identified using the obtained MS data and by comparison with commercial standards, orbitrap Chinese Traditional Medicine Library, and previous literature. Twenty-five of the identified compounds were detected for the first time in the pomelo peel extracts. Results suggested that the pomelo peels of C. grandis cv. Shatianyou contained the most natural chemical compositions. The pooled result may offer scientific evidence for further development and utilization of pomelo peels and a route for screening appropriate varieties for various demands.