Food and Nutraceutical Applications of Algae

Jayappriyan, K.R.; Balakrishnan, Baskar; Vijayakumar, M.; Brabakaran, A.; Rajkumar, R. S.; Elumalai, Sasikumar

doi:10.1201/9781003165941-6

Cited by 3 publications

(1 citation statement)

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“…Microalgae and macroalgae, as photoautotrophic organisms, have been extensively employed in the green synthesis of nanoparticles. Algae exist in various habitats and produce variegated bioactive substances such as polysaccharides, pigments, proteins, minerals, phenolics, flavonoids, tannins, and steroids [ 6 ], which are capable of reducing metal salts to respective NPs without any hazardous byproducts [ 7 , 8 , 9 ]. Recently, several studies have reported the synthesis of NPs using algal extracts from various algal species, including Turbinaria conoides [ 10 ], Sargassum polycystum [ 11 ], Laminaria japonica [ 12 ], Botryococcus braunii [ 5 ], Oscillatoria limnetica [ 13 ], Chlorella ellipsoidea [ 2 ], Gracilaria edulis [ 14 ], and Synechocystis sp.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Maduraimuthu,

Ranishree,

Gopalakrishnan

et al. 2023

Antioxidants

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While various methods exist for synthesizing silver nanoparticles (AgNPs), green synthesis has emerged as a promising approach due to its affordability, sustainability, and suitability for biomedical purposes. However, green synthesis is time-consuming, necessitating the development of efficient and cost-effective techniques to minimize reaction time. Consequently, researchers have turned their attention to photo-driven processes. In this study, we present the photoinduced bioreduction of silver nitrate (AgNO3) to AgNPs using an aqueous extract of Ulva lactuca, an edible green seaweed. The phytochemicals found in the seaweed functioned as both reducing and capping agents, while light served as a catalyst for biosynthesis. We explored the effects of different light intensities and wavelengths, the initial pH of the reaction mixture, and the exposure time on the biosynthesis of AgNPs. Confirmation of AgNP formation was achieved through the observation of a surface plasmon resonance band at 428 nm using an ultraviolet-visible (UV-vis) spectrophotometer. Fourier transform infrared spectroscopy (FTIR) revealed the presence of algae-derived phytochemicals bound to the outer surface of the synthesized AgNPs. Additionally, high-resolution transmission electron microscopy (HRTEM) and atomic force microscopy (AFM) images demonstrated that the NPs possessed a nearly spherical shape, ranging in size from 5 nm to 40 nm. The crystalline nature of the NPs was confirmed by selected area electron diffraction (SAED) and X-ray diffraction (XRD), with Bragg’s diffraction pattern revealing peaks at 2θ = 38°, 44°, 64°, and 77°, corresponding to the planes of silver 111, 200, 220, and 311 in the face-centered cubic crystal lattice of metallic silver. Energy-dispersive X-ray spectroscopy (EDX) results exhibited a prominent peak at 3 keV, indicating an Ag elemental configuration. The highly negative zeta potential values provided further confirmation of the stability of AgNPs. Moreover, the reduction kinetics observed via UV-vis spectrophotometry demonstrated superior photocatalytic activity in the degradation of hazardous pollutant dyes, such as rhodamine B, methylene orange, Congo red, acridine orange, and Coomassie brilliant blue G-250. Consequently, our biosynthesized AgNPs hold great potential for various biomedical redox reaction applications.

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Section: Introductionmentioning

confidence: 99%

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Maduraimuthu,

Ranishree,

Gopalakrishnan

et al. 2023

Antioxidants

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Chlorophyta microalgae as dietary protein supplement: a comparative analysis of productivity related to photosynthesis

et al. 2022

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Microalgae are studied as innovative sources of a wide range of highly valuable products, including proteins for the food/feed sectors. However, protein content varies depending on algal species, culture conditions and harvesting period. The Phylum Chlorophyta includes most of the described species of green algae. Due to their remarkable peculiarities, four Chlorophyta species belonging to two distinct classes were selected for the research: Chlorella vulgaris and Chlorella protothecoides as Trebouxiophyceae, and Neochloris oleoabundans and Scenedesmus acutus as Chlorophyceae. The algae were studied to obtain comparative results about their growth performance, and total protein content and profile under the same culture conditions. Since photosynthetic process directly influences biomass production, photosynthetic pigment, PSII maximum quantum yield and thylakoid protein content and profile were analysed. SDS-PAGE and 2D BN/SDS-PAGE were performed to expand information on the organization and assembly of the resolved thylakoid complexes of samples. Despite the algal species showed similar growth rates and photosynthetic efficiency, S. acutus showed the highest capability to accumulate proteins and photosynthetic pigments. Regarding the thylakoid protein profile, the two Trebouxiophyceae showed very similar pattern, whereas different amounts of LHCII occurred within the two Chlorophyceae. Finally, the separation of thylakoid protein complexes in 2D BN/SDS-PAGE revealed a more complex pattern in S. acutus as compared to the other species. Overall, it is suggested that a higher stability of the photosynthetic membranes can result in higher biomass and protein production. Altogether, results have highlighted the metabolic uniqueness of each strain, resulting in a non-obvious comparison with the other species.

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Changes in Vitamin B Complex of Chlorella vulgaris during Long Term Baking Conditions

HAZNEDAROĞLU

2023

Akademik Gıda

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Bu çalışmada besleyici öğeler açısından zengin, farklı fonksiyonel gıdalarda kullanımı giderek yaygınlaşan Chlorella vulgaris türü mikroalglerde bulunan B vitamini içeriklerinin 125°C sıcaklıkta ve 35 dakikalık pişirme koşulları altında değişimi incelenmiştir. Ultra yüksek performanslı sıvı kromatografisi-yüksek çözünürlüklü kütle spektrometresi (UHPLC-HR/MS) kullanılarak gerçekleştirilen ölçümlerde 35 dakikalık pişirme süresi sonrası B1 (tiamin), B2 (riboflavin), B3 (niasin), ve B6 (piridoksin) vitaminlerinin pişirme işlemine maruz bırakılmayan kontrol grubuna kıyasla istatistiki olarak anlamlı şekilde (p0.05) gözlenmiştir. Otuz beş dakikalık uzun ısıl işlemlerinin, kalın bir hücre çeperine sahip Chlorella vulgaris mikroalg türünde daha fazla B vitamini açığa çıkmasına yardımcı olabileceği; böylelikle ısıl işlemlere karşı hassas olan ve pişirme sonrası bozunduğu bilinen B vitaminlerinin, Chlorella vulgaris türü mikroalglerde pişirme sırasında korunarak fonksiyonel gıda ürünlerinde kullanılabileceği değerlendirilmiştir.

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Food and Nutraceutical Applications of Algae

Cited by 3 publications

References 0 publications

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Chlorophyta microalgae as dietary protein supplement: a comparative analysis of productivity related to photosynthesis

Changes in Vitamin B Complex of Chlorella vulgaris during Long Term Baking Conditions

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