Simplified recovery of enzymes and nutrients in sweet potato wastewater and preparing health black tea and theaflavins with scrap tea

Li, Qingrong; Luo, Jialing; Zhou, Zhen; Wang, Guangying; Rui, Chen; Cheng, Shi-Hui; Wu, Min; Li, Hui; Ni, He; Li, Haihang

doi:10.1016/j.foodchem.2017.11.095

Cited by 16 publications

(17 citation statements)

References 22 publications

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“…The theaflavin transformation and analysis of theaflavins are the same as described by Li et al . 1 . The reaction was conducted in a 25-mL solution of green tea extracts which contains 1.0 mg/mL EGCG, 2 mL peroxidase solution and 100 μL 30% H 2 O 2 .…”

Section: Methodsmentioning

confidence: 99%

“…Sweet potato [ Ipomoea batatas (L.) Lam] is the sixth most important food crop in the world with annual tuberous root production of more than 100 million tons. The crop is tolerant of diseases, pests and abiotic stresses and uses little pesticides in cultivation 1 . Recent studies show that sweet potato contains many functional components such as phenolics, flavonoids and dietary fiber, which are important for human health 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In food industry, peroxidase is an excellent food additive to whiten the flour. Like polyphenol oxidase 1 , peroxidases can catalyze the transformation of catechins into theaflavins and improve the quality of black tea 17,18 .…”

Section: Introductionmentioning

confidence: 99%

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Preparation of peroxidase and phenolics using discarded sweet potato old stems

Liu

Luo

et al. 2019

Sci Rep

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Sweet potato ( Ipomoea batatas L.) is the sixth most important food crop in the world. The industry discarded huge amount of sweet potato stems, rich of peroxidases and phenolics. A simple procedure was developed to make peroxidases and phenolics from sweet potato old stems. Dried stem powder was loaded into columns with water and eluted sequentially with water and 50% ethanol. Peroxidases (91%) were extracted in 5.5-fold water extracts and 87% phenolics were extracted in 4.4-fold ethanol extracts. Purified peroxidases powder was yielded at 3.1 g (8.6 unit/mg) per kilogram stems by PEG6000/Na 2 SO 4 aqueous two-phase purification from the water extracts (93.2% recovery), followed by ethanol precipitation and vacuum freeze-drying. The purified peroxidase had high activity in transforming tea catechins into theaflavins. Phenolics powder containing 43% phenolics and 27% flavonoids was yielded at 76.9 g per kilogram stems after vacuum-concentrating the ethanol extracts. This method can make valuable functional products using the sweet potato waste.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of peroxidase and phenolics using discarded sweet potato old stems

Liu

Luo

et al. 2019

Sci Rep

Self Cite

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show abstract

Section: Introductionmentioning

confidence: 99%

Antiviral mechanism of tea polyphenols on porcine reproductive and respiratory syndrome virus

Dong¹,

Wang²,

Zhang³

et al. 2020

Preprint

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Background: Neither inactivated vaccine nor attenuated vaccine can effectively prevent and control the infection and spread of porcine reproductive and respiratory syndrome virus (PRRSV). Therefore, it is necessary to broaden new horizons and to conceive effective preventive strategies. Tea polyphenols (TPP) are polyphenol in tea. The main components of TPP are catechins and their derivatives. TPP has many physiological activities and has certain antiviral and antifungal effects. But whether TPP owns anti-PRRSV activity remains unclear. Results: We found that TPP effectively inhibited PRRSV replication in Marc-145 cells by suppressing viral attachment and internalization. TPP exhibited a potent anti-PRRSV effect regardless of its pre-treatment or post-treatment. In addition, we demonstrated that TPP restrained PRRSV-induced p65 entry into the nucleus to suppress the activation of the NF-κB signaling pathway, which ultimately leads to the inhibition of the expression of inflammatory cytokines. Furthermore, TPP limited the synthesis of viral non-structural protein 2 (nsp2), the core component of viral replication transcription complexes, which may contribute to the inhibition of viral RNA replication. Conclusions: TPP has the potential to develop into an effective antiviral agent for PRRSV prevention and control in the future.

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“…It is a compound with polyphenolic structural properties, such as catechins and anthocyanins. TPP is the main component of green tea soup, which has certain antiviral and antifungal effects [13][14][15]. It was pointed out in the past investigations that epigallocatechin gallate (EGCG) which accounts for 60 to 80% of TPP has already been reported for its antiviral effect on several viruses: hepatitis C virus, chikungunya virus, hepatitis B virus, and Zika virus [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Antiviral Mechanism of Tea Polyphenols on Porcine Reproductive and Respiratory Syndrome Virus

Dong¹,

Wang²,

Zhang³

et al. 2020

Preprint

View full text Add to dashboard Cite

Background: Neither inactivated vaccine nor attenuated vaccine can effectively prevent and control the infection and spread of Porcine reproductive and respiratory syndrome virus (PRRSV). Therefore, it is necessary to broaden new horizons and conceive effective preventive strategies. Tea polyphenols (TPP) are polyphenol in tea. The main components of TPP are catechins and their derivatives. TPP has many physiological activities, and has certain antiviral and antifungal effects. But whether TPP owns anti-PRRSV activity remains unclear.Results: We found that TPP effectively inhibited PRRSV replication in Marc-145 cells through suppressing viral attachment and internalization. TPP exhibited a potent anti-PRRSV effect regardless of its pre-treatment or post-treatment. In addition, we demonstrated that TPP restrained PRRSV-induced p65 entry into the nucleus to suppress the activation of the NF-κB signaling pathway, which ultimately leads to the inhibition of the expression of inflammatory cytokines. Furthermore, PRRSV limited the synthesis of viral non-structural protein 2 (nsp2), the core component of viral replication transcription complexes, which may contribute to the inhibition of viral RNA replication.Conclusions: TPP has the potential to develop into an effective antiviral agent in PRRSV prevention and control in future.

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Simplified recovery of enzymes and nutrients in sweet potato wastewater and preparing health black tea and theaflavins with scrap tea

Cited by 16 publications

References 22 publications

Preparation of peroxidase and phenolics using discarded sweet potato old stems

Preparation of peroxidase and phenolics using discarded sweet potato old stems

Antiviral mechanism of tea polyphenols on porcine reproductive and respiratory syndrome virus

Antiviral Mechanism of Tea Polyphenols on Porcine Reproductive and Respiratory Syndrome Virus

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