Comparing Methods for Extracting Healthy Compounds from Mandarin Peels

Greg Howard
19th July, 2024

Comparing Methods for Extracting Healthy Compounds from Mandarin Peels

Ultrasound-assisted extraction yielded the highest total phenolic content from mandarin (Citrus reticulata) peels, demonstrating its superior efficiency for isolating these beneficial compounds compared to microwave, Soxhlet, and maceration techniques.

Image adapted from: Kaur et al. / CC BY (Source)

Key Findings

  • The study from Sant Longowal Institute of Engineering and Technology focused on extracting bioactive compounds from mandarin peels using various techniques
  • Ultrasound-assisted extraction (UAE) was found to be the most efficient method, yielding the highest amounts of beneficial compounds like quercetin, gallic acid, hesperidin, and ferulic acid
  • These compounds have strong antioxidant and anti-inflammatory properties, which are crucial in preventing cancer and other chronic diseases
The exploration of citrus waste valorization extends beyond its environmental benefits to encompass potential health implications, particularly in cancer prevention. The bioactive compounds extracted from citrus waste, notably polyphenols like quercetin, gallic acid, hesperidin, and ferulic acid, hold promising anti-cancer properties. Research from Sant Longowal Institute of Engineering and Technology suggests that these compounds exhibit potent antioxidant and anti-inflammatory effects, which are integral in combating carcinogenesis[1]. Citrus fruits are widely consumed around the world, and their industrial processing generates significant amounts of waste. This waste, however, is a potential source of high-value bioactive compounds. Previous studies have highlighted the health benefits of citrus bioactives in minimizing the risk of metabolic syndrome and other diseases[2]. Furthermore, there is an increasing need to manage citrus waste responsibly due to environmental and economic factors, which has spurred research into non-conventional extraction methods to obtain these valuable compounds[3]. The present study focuses on comparing conventional (soxhlet, maceration) and non-conventional (ultrasound, microwave) techniques to extract polyphenols from mandarin peels. The goal was to identify the most efficient method to obtain these bioactive compounds, which include quercetin, gallic acid, hesperidin, and ferulic acid. These compounds are known for their antioxidant and anti-inflammatory properties, which are crucial in preventing the initiation and progression of cancer. Quercetin, a flavonoid abundantly found in citrus extracts, has been noted for its ability to inhibit cancer cell proliferation and induce apoptosis (programmed cell death), thereby impeding tumor growth. Gallic acid demonstrates anticancer potential through its modulation of signaling pathways associated with cell survival and proliferation. Hesperidin, another compound with antioxidative properties, has shown promise in suppressing tumor growth and metastasis by targeting various molecular pathways involved in cancer progression. Ferulic acid, known for its anti-inflammatory and antioxidant activities, exhibits chemopreventive effects by inhibiting carcinogen activation and promoting detoxification processes within the body. The study found that the maximum total phenolic content of 3.78 mg GAE/g dry peels and DPPH activity of 69.89% was observed using 80% methanol and ultrasound-assisted extraction (UAE). The presence of these compounds was confirmed using advanced analytical methods such as Fourier Transform Infrared Spectroscopy (FT-IR) and High-Performance Liquid Chromatography (HPLC). The phenolic compounds observed during UAE, such as gallic acid (0.29 ± 1.08 mg/g dry peels), p-coumaric acid (0.17 ± 0.52 mg/g dry peels), chlorogenic acid (0.30 ± 0.56 mg/g dry peels), ferulic acid (1.49 ± 1.36 mg/g dry peels), hesperidin (1.34 ± 0.51 mg/g dry peels), naringenin (0.56 ± 0.94 mg/g dry peels), and quercetin (0.33 ± 1.02 mg/g dry peels), were 25–35% higher compared to other techniques. This study builds on earlier research that has demonstrated the health benefits of citrus bioactives[2]. It also aligns with findings that significant amounts of citrus by-products remain after juice processing, which are rich in bioactive compounds that can be repurposed for nutraceutical applications[4]. The use of non-conventional methods such as ultrasound-assisted extraction not only enhances the yield of these valuable compounds but also supports environmental sustainability by converting waste into high-value products[3]. By harnessing the bioactive potential of citrus waste-derived compounds, particularly for cancer prevention, this study from Sant Longowal Institute of Engineering and Technology contributes to both environmental sustainability and human health enhancement. It paves the way for innovative strategies in functional food development and nutraceutical applications, offering a dual benefit of reducing environmental waste and providing health-promoting compounds.

FruitsSustainabilityBiochem

References

Main Study

1) Extraction and characterization of phenolic compounds from mandarin peels using conventional and green techniques: a comparative study

Published 18th July, 2024

https://doi.org/10.1007/s44187-024-00139-y

Related Studies

2) Bioactive Compounds of Citrus Fruits: A Review of Composition and Health Benefits of Carotenoids, Flavonoids, Limonoids, and Terpenes.

https://doi.org/10.3390/antiox11020239

3) High Biological Value Compounds Extraction from Citrus Waste with Non-Conventional Methods.

https://doi.org/10.3390/foods9060811

4) Comparison of different Brazilian citrus by-products as source of natural antioxidants.

https://doi.org/10.1007/s10068-018-0383-4


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