Enhancement of the Antioxidant and Antimicrobial Activities of Porphyran through Chemical Modification with Tyrosine Derivatives

Adão, Pedro; Reboleira, João; Teles, Marco; Santos, Beatriz; Ribeiro, Nádia; Teixeira, Carlos M.; Guedes, M.; Pessoa, João Costa; Bernardino, Susana

doi:10.3390/molecules26102916

Cited by 9 publications

(5 citation statements)

References 103 publications

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“…This bioactivity was not expected on sulfated polysaccharides such as porphyran, justifiable most probably by the presence of phenols and other secondary metabolites capable of undergoing single-electron transfer reactions [55]. Porphyran extracts are reported to have low antioxidant activity in one-electron donation assays such as DPPH, with less than a 2% inhibition rate at similar concentrations [64] and in ABTS an inhibition rate in the range of 1.5-2.8% [65]. Only in aqueous extracts with a high content of phenols was this activity found to be higher [66].…”

Section: Comparative Analysis Of the Different Assaysmentioning

confidence: 99%

Development and Characterization of Films for Food Application Incorporating Porphyran Extracted from Porphyra dioica

et al. 2022

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Non-biodegradable plastic is one of the biggest environmental problems of our lifetime and, considering the present societal needs, it will get worse. Consequently, there is an urgent need to develop sustainable and renewable alternatives to plastic, such as plastic-like materials obtained from biodegradable polymers, namely sulfated polysaccharides, considered one of the most viable alternatives. There is also a need to obtain these materials in an environmentally and economically sustainable way. The hereby developed process of obtaining film-forming solutions from semi-refined porphyran (PorphSR) uses a green solvent (hot water) with a high extraction yield of semi-refined porphyran (26.66 ± 0.27%) in a reproducible way and with low levels of contaminants. The obtained semi-refined porphyran showed good antioxidant potential in all tests performed: HPSA (Δ0.066 ± 0.002), DPPH (2.23 ± 0.78%), FRAP (0.420 ± 0.014 eq. ascorbic acid µg mg−1 of extract) and ABTS (20.46 ± 0.90%). After being cast into films, the most notable antioxidant properties were those of the semi-refined porphyran in the DPPH, FRAP and ABTS assays and of the pectin, (PorphSR_PcT and PorphSR_PcT_Gly) in the HPSA assay. Morphologically, the films showed relatively homogeneous and low roughness surfaces. It is concluded that the described method to obtain semi-refined porphyran is feasible and reproducible, and that the developed films, mainly PorfP2_PcT_Gly, proved to be a potential candidate for non-biodegradable plastic substitutes.

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Section: Comparative Analysis Of the Different Assaysmentioning

confidence: 99%

Development and Characterization of Films for Food Application Incorporating Porphyran Extracted from Porphyra dioica

et al. 2022

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“…The ferric reducing power assay was determined using the method reported by Adão et al [58]. A volume of 1.5 mL of distilled water was added to 1 mL of the aqueous extract (0.6 mg mL −1 ) and 0.5 mL of a previously prepared [FeIII(Phen)3]Cl 3 solution at 3.3 mM.…”

Section: Ferric Reducing Power Assay (Frap)mentioning

confidence: 99%

Seasonal Nutritional Profile of Gelidium corneum (Rhodophyta, Gelidiaceae) from the Center of Portugal

Cavaco

Duarte

Freitas

et al. 2021

Foods

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Gelidium corneum is a well-known agarophyte, harvested worldwide for its high agar quality. However, the species also exhibits an interesting nutritional profile, but with seasonal variations. Therefore, to evaluate the nutritional value of G. corneum, ash, crude protein, total lipids, and carbohydrates were analyzed at different times of the year. The heavy metals mercury, arsenic, lead, cadmium, and tin, as well as iodine were also measured. Finally, the seasonal antioxidant capacity of G. corneum extracts was evaluated. Our results indicate that the biomass is rich in protein (up to 16.25 ± 0.33%) and carbohydrates (up to 39.5 ± 3.29%), and low in lipids (up to 2.75 ± 0.28%), and especially in the summer, the AI, TI indexes, n-6/n-3 and h/H ratios (0.93, 0.6, 0.88 and 1.08, respectively) are very interesting. None of the contaminants exceeded the legally established limits, and the iodine values were adequate for a healthy diet. Finally, the antioxidant capacity is fair, with the DPPH £ 10.89 ± 1.46%, and ABTS £ 13.90 ± 1.54% inhibition, FRAP £ 0.91 ± 0.22 AAE.g−1, and TPC £ 6.82 ± 0.26 GAE.g−1. The results show that G. corneum is an attractive resource, with potential use as food or as a food supplement.

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“…Furthermore, tyrosine metabolism within C. japonica was significantly enriched after 24 hours of D. houi larvae feeding. Previous research has indicated that tyrosine is a precursor of alkaloids and natural phenols with antioxidant, anti-inflammatory, and antimicrobial functions [72,73]. L-tyrosine can be converted to p-coumaric acid by tyrosine ammonia-lyase, an aromatic phenylpropanoid [74,75].…”

Section: Discussionmentioning

confidence: 99%

Transcriptome Analysis Reveals the Response of Cryptomeria japonica to Feeding Stress of Dendrolimus houi Lajonquière Larvae

Que,

Xie,

Fang

et al. 2023

Forests

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The Japanese fir, Cryptomeria japonica, is ecologically and commercially vital in China. However, infestations by Dendrolimus houi Lajonquière larvae cause widespread dieback, mimicking mechanical damage effects, with unclear differential impacts and mechanisms. To address this, 6th instar larvae of D. houi were introduced to three-year-old C. japonica seedlings to induce pest infestation, while mechanical damage and non-infested pests were controlled. Then, next-generation sequencing techniques were employed, and transcriptome sequencing was conducted to analyze the distinct damage mechanisms responding to C. japonica. This study revealed 10,412 DEGs between pest infestation and controls and 5535 DEGs comparing pest infestation to mechanical damage. Functional enrichment analysis highlighted the involvement of these DEGs in crucial processes such as photosynthesis, amino acid and nucleotide metabolism, flavonoid biosynthesis, and plant hormone signaling pathways. In particular, 786 unique DEGs were discerned in pest-infested samples. Key enriched pathways, such as pyruvate and propionate metabolism, were pinpointed, with flavonoid biosynthesis potentially closely linked to pest-feeding inductions. These findings provided valuable insights into the molecular responses of C. japonica to D. houi infestation, laying the foundation for future research aimed at developing pest-resistant varieties of Japanese fir.

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Enhancement of the Antioxidant and Antimicrobial Activities of Porphyran through Chemical Modification with Tyrosine Derivatives

Cited by 9 publications

References 103 publications

Development and Characterization of Films for Food Application Incorporating Porphyran Extracted from Porphyra dioica

Development and Characterization of Films for Food Application Incorporating Porphyran Extracted from Porphyra dioica

Seasonal Nutritional Profile of Gelidium corneum (Rhodophyta, Gelidiaceae) from the Center of Portugal

Transcriptome Analysis Reveals the Response of Cryptomeria japonica to Feeding Stress of Dendrolimus houi Lajonquière Larvae

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