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Effects of the sunscreen ultraviolet filter,oxybenzone,on green microalgae

Advances in Polar Science 2020年第2期31卷 112-123页

作者： Ming-Li TEOH Nur Suhaida SANUSI Ching-Yee WONG john beardall School of Biosciences Taylor’s UniversityLakeside Campus47500 Subang JayaSelangor Darul EhsanMalaysia Institute of Ocean and Earth Sciences University of Malaya50603 Kuala LumpurMalaysia National Antarctic Research Centre Institute of Graduate StudiesUniversity of Malaya50603 Kuala LumpurMalaysia School of Biological Sciences Monash UniversityClaytonVictoria 3800Australia

Ultraviolet(UV)filters are widely used in sunscreen and personal care products due to their ability to give protection to our skin from UV ***,commonly known as benzophenone-3,is one type of UV filter found as the active ingredient in many pharmaceutical *** oxybenzone has been extensively studied as an environmental toxicant in the ecosystem,little is known about its toxicity effects on *** effects of oxybenzone on growth(measured as OD620 nm,chlɑand carotenoids)and macromolecular composition of polar microalgae(Chlorella UMACC 400 and Chlorella UMACC 401)and temperate microalgae(Chlorella sp.,Chlamydomonas reinhardtii,Scenedesmus quadricauda)were *** microalgae were cultured in triplicate and exposed to different oxybenzone concentrations(0,100,200,300 and 400 mg·L-1),at 4℃and 18 for polar and temperate species respectively,for 96 *** oxybenzone concentrations used℃represent a range from environmental to extreme concentrations to understand the impact of this toxicant on *** results showed that the highest concentration of oxybenzone(300 and 400 mg·L-1)had adverse effects on growth rate and biomass of these ***,exposure to oxybenzone concentrations ranging from 200 mg·L-1 to 400 mg·L-1 did not have significant effects on *** *** exposure to oxybenzone at higher concentrations also led to changes in cell structure after 96 ***,protein and carbohydrate content of all microalgae except *** increased with increasing oxybenzone *** content increased significantly when cells were exposed to oxybenzone,though effects were greater in the polar species,suggesting that it could be one of the adaptive strategies that enabled these microalgae to tolerate *** investigation is required to determine the effects of oxybenzone on other features of microalgal performance at relevant environmental concentrations.

关键词： polar algae temperate algae Chlorella benzophenone-3 emerging contaminants

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Growth and photosynthesis of Chlorella strains from polar,temperate and tropical freshwater environments under temperature stress

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Journal of Oceanology and Limnology 2018年第4期36卷 1266-1279页

作者： Kok-Keong LEE Phaik-Eem LIM Sze-Wan POONG Chiew-Yen WONG Siew-Moi PHANG john beardall Institute of Ocean and Earth Sciences University of Malaya Institute of Graduate Studies University of Malaya School of Health Sciences International Medical University National Antarctic Research Centre University of Malaya Institute of Biological Sciences University of Malaya School of Biological Sciences Monash University

Elevated temperatures as a consequence of global warming have significant impacts on the adaptation and survival of microalgae which are important primary producers in many ecosystems. The impact of temperature on the photosynthesis of microalgae is of great interest as the primary production of algal biomass is strongly dependent on the photosynthetic rates in a dynamic environment. Here, we examine the effects of elevated temperature on Chlorella strains originating from different latitudes, namely Antarctic, Arctic, temperate and tropical regions. Chlorophyll fluorescence was used to assess the photosynthetic responses of the microalgae. Rapid light curves(RLCs) and maximum quantum yield( F_v/F_m) were recorded. The results showed that Chlorella originating from different latitudes portrayed different growth trends and photosynthetic performance. The Chlorella genus is eurythermal, with a broad temperature tolerance range, but with strain-specific characteristics. However, there was a large overlap between the tolerance range of the four strains due to their "eurythermal adaptivity". Changes in the photosynthetic parameters indicated temperature stress. The ability of the four strains to reactivate photosynthesis after inhibition of photosynthesis under high temperatures was also studied. The Chlorella strains were shown to recover in terms of photosynthesis and growth(measured as Chl a) when they were returned to their ambient temperatures. Polar strains showed faster recovery in their optimal temperature compared to that under the ambient temperature from which they were isolated.

关键词： Antarctic Arctic Fv/Fm microalgae pigments recovery

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Chlorella across latitudes: investigating biochemical composition and antioxidant activities for biotechnological applications

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Advances in Polar Science 2023年第4期34卷 340-351页

作者： Chloe Zi-En WONG Ming-Li TEOH Sook Wah CHAN Nallammai SINGARAM Wendy Ming-Yen TEOH john beardall School of Biosciences Faculty of Health and Medical SciencesTaylor’s UniversitySubang Jaya 47500Malaysia Clean Technology Impact Lab Taylor’s UniversitySubang Jaya 47500Malaysia Food Security&Nutrition Impact Lab Taylor’s UniversitySubang Jaya 47500Malaysia Institute of Technology Management and Entrepreneurship Universiti Teknikal Malaysia Melaka(UTeM)Durian Tunggal 76100Malaysia School of Biological Sciences Monash UniversityClayton VIC 3800Australia

With the present day rise of interest in acquiring sustainability in the pharmaceutical industry,there has been an emphasis on finding natural resources to replace the use of synthetic compounds used in *** have garnered significant attention owing to their natural and sustainable capability to produce a diverse array of bioactive ***,this study aims to evaluate the biochemical composition and antioxidant properties of Chlorella strains from a tropical region(Chlorella UMACC 051 and Chlorella UMACC 038)and a polar region(Chlorella UMACC 250 and Chlorella UMACC 234).The cultures were grown for 10 *** the end of the experiment,the specific growth rate,chlorophyll-a content,carotenoid content,biomass,and biochemical composition such as carbohydrate,protein and lipid content were *** addition,the phytochemical properties were determined using a total phenolic assay while the antioxidant activities were determined using 2,2-diphenyl-1-picrylhydrazyl(DPPH).Of all Chlorella strains tested,the tropical Chlorella UMACC 051 showed the fastest growth rate and biomass while the polar Chlorella UMACC 234 contained the highest pigment content and tropical Chlorella UMACC 038 has the highest total phenolic *** biochemical composition analysis showed all strains have a high lipid content ranging from 45.36%to 60.30%dry *** Chlorella strains exhibited a small amount of antioxidant activity(15.42%to 30.15%)and total phenolic content ranging from 1.91±0.04 to 4.43±0.10 mg GAE·g–1 dry *** results indicated that polar Chlorella UMACC 234 has the most potential in containing significant amounts of bioactive compounds.

关键词： Chlorella polar tropical biochemical composition total phenolic content DPPH

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