Effect of pH on fluorescence and absorption of aggregates of chlorophyll a and carotenoids

Qu, Fang; Gong, Nan; Wang, Shenghan; Gao, Yue; Sun, Chengxin; Fang, Wen‐Hui; Men, Zhiwei

doi:10.1016/j.dyepig.2019.107975

Cited by 21 publications

(8 citation statements)

References 39 publications

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“…Our result indicated that the average degradation rate of chlorophyll a was dependent on the acidity of the ambient fine particle. Previous studies had suggested that chlorophyll a (C 55 H 72 MgN 4 O 5 ) is easily decomposed into pheophytin a (C 55 H 74 N 4 O 5 ) and magnesium (Mg) in an acidic solution . Our result highlights that chlorophyll a could be decomposed in a short period (∼24 h) with acidic environmental pollutants from local emission sources.…”

Section: Resultssupporting

confidence: 51%

“…Previous studies had suggested that chlorophyll a (C 55 H 72 MgN 4 O 5 ) is easily decomposed into pheophytin a (C 55 H 74 N 4 O 5 ) and magnesium (Mg) in an acidic solution. 60 Our result highlights that chlorophyll a could be decomposed in a short period (∼24 h) with acidic environmental pollutants from local emission sources. Due to the lack of the accumulation rate at the plant surface (mass per time per plant surface area), this study is unable to estimate the chlorophyll depletion rate associated with the exposures to ambient aerosol acidity at the plant surface.…”

Section: Mobile Source (Ms)mentioning

confidence: 58%

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Sources of Aerosol Acidity at a Suburban Site of Nanjing and Their Associations with Chlorophyll Depletion

Gong

Tao

Liu

et al. 2021

ACS Earth Space Chem.

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There is a need to understand the impacts of ambient aerosol acidity on the photosynthetic process in terrestrial plants and its connection to carbon storage. To help address this need, we conducted a study to investigate the acidity of ambient aerosol on the stability of chlorophyll, the main indicator of photosynthetic processes in leaves. Ambient fine particulate matter (<2.5 μm in aerodynamic diameter or PM2.5) sampled at a suburban site of Nanjing during cold seasons of 2019 and 2020 was collected. Ambient levels of gaseous pollutants including NO2, SO2, and CO; daily maximum 8 h average O3 concentration (O3-8h); and daily meteorological parameters were also recorded. Water-soluble ions of F–, Cl–, NO3 –, SO4 2–, NH4 +, Na+, K+, Mg2+, and Ca2+ in collected PM2.5 samples were determined using an ion chromatograph. The Extended Aerosol Inorganics Model version IV (E-AIM IV) was used to estimate the total acidity and in situ pH of collected PM2.5 samples, while Positive Matrix Factorization 5.0 (PMF) was used to apportion emission sources. Depletion of chlorophyll a and b was determined using water extracts of collected PM2.5 samples. Estimated in situ pH levels of collected PM2.5 samples were in the range of pH 2–4. Associations were found between the concentration of SO4 2– and the total acidity of ambient PM2.5 particles. Source apportionment results showed that five PM sources including dust source (DS), secondary source (SS), industrial source (IS), mobile source (MS), and biomass burning (BB) contributed to aerosol acidity of ambient PM2.5 particles. Aerosol acidity, rather than PM2.5 mass, resulting from water-soluble ions in gaseous pollutants was the dominant factor influencing the stability of chlorophyll a. Alternatively, chlorophyll b was found to be stable with the exposure to water extracts of ambient PM2.5 particles within 60 h. This study provides the first field evidence that aerosol acidity could result in the depletion of chlorophyll a.

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Section: Resultssupporting

confidence: 51%

Section: Mobile Source (Ms)mentioning

confidence: 58%

Sources of Aerosol Acidity at a Suburban Site of Nanjing and Their Associations with Chlorophyll Depletion

Gong

Tao

Liu

et al. 2021

ACS Earth Space Chem.

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“…The decrease in fluorescence intensity is a result of the quenching induced by chlorophyll aggregation [ 36 ]. Qu et al [ 37 ] showed that chlorophyll a formed J-type and H-type aggregation in acidic ethanol solution. Our results also show this conclusion, and HHP will be conducive to the aggregation of chlorophyll.…”

Section: Resultsmentioning

confidence: 99%

Effects of Different Zn2+ Concentrations and High Hydrostatic Pressures (HHP) on Chlorophyll Stability

Sun

2022

Foods

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This study provides a new idea for improving chlorophyll stability and color quality of green leafy vegetables by Zn2+ synergistic HHP. Zn-chlorophyll was prepared with zinc acetate and chlorophyll under HHP treatment. The effects of different zinc acetate concentrations and pressures on chlorophyll color, antioxidant activity, Zn2+ replacement rate, structure, and thermal stability were analyzed. Results showed with increased zinc acetate concentration and pressure, −a* value, antioxidant activity, and Zn2+ replacement rate of samples gradually increased. However, FTIR indicated the structure did not change. HHP fluorescence online analysis showed fluorescence intensity of samples decreased with zinc acetate concentration and pressure increasing. With zinc acetate 10 mg/100 mL and HHP 500 MPa, the highest −a* value (5.19), antioxidant activity (ABTS, DPPH, and FRAP were 37.03 g ACE/100 g, 25.95 g ACE/100 g, 65.43 g TE/100 g DW, respectively), and Zn2+ replacement rate (42.34%) were obtained. Thermal stability of Zn-chlorophyll obtained by synergistic effect was improved significantly.

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“…In the cage culture area, PC1 had high loadings on Chla, T, pH which can be regarded as the photosynthesis of phytoplankton. Temperature affects phytoplankton growth by affecting photosynthesis and phosphorus concentration [48], and pH affects the photosynthesis of phytoplankton by affecting fluorescence absorption of chlorophyll [49].In PC2, SAL with positive loading and DIN with negative loading occupied relative high loadings. Salinity variations led to the changes of microbial function and the process of nitrification and denitrification, affecting the contents of DIN in water [50].…”

Section: Discussionmentioning

confidence: 99%

Evaluation and Analysis of Water Quality of Marine Aquaculture Area

Zhang

et al. 2020

IJERPH

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In the rapid development of marine aquaculture, the water quality of aquatic environments is regarded as a main limiting factor. Therefore, it is necessary to assess the water quality and environmental conditions in marine aquaculture areas and find out the main influencing factors regarding damage to the water quality environment. In the present research, pond aquaculture and cage aquaculture areas were sampled in May, August and November in 2018. Nine water quality indicators were detected, including pH, temperature, salinity, dissolved oxygen, molybdate-reactive phosphorus, chemical oxygen demand, chlorophyll a, inorganic nitrogen and antibiotic resistance genes (ARGs). Principal component analysis (PCA) was used to analyze the water quality conditions, spatial–temporal changes, and the driving factors in pond and cage aquaculture areas. The results showed that three main components were extracted from the pond aquaculture area, which explained 66.82% of the results, the most relevant factors are salinity, dissolved oxygen and ARGs. For the cage aquaculture area, three main components were extracted which can account for 72.99% of the results, the most relevant factors are chlorophyll a, salinity and dissolved oxygen. The comprehensive scores of the principal components indicated that the heaviest polluted months in pond and aquaculture areas were August and November, respectively. The water quality of the pond aquaculture area is mainly limited by the volume of the pond, while aquaculture activities and seasonality are the main factors for cage aquaculture. ARGs in cage culture areas showed more variety and frequency compared with pond culture areas, which indicated that terrestrial input might be one of the sources for ARGs occurrence. The results would be helpful for the relevant authorities to select water quality monitoring parameters in marine aquaculture areas.

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Effect of pH on fluorescence and absorption of aggregates of chlorophyll a and carotenoids

Cited by 21 publications

References 39 publications

Sources of Aerosol Acidity at a Suburban Site of Nanjing and Their Associations with Chlorophyll Depletion

Sources of Aerosol Acidity at a Suburban Site of Nanjing and Their Associations with Chlorophyll Depletion

Effects of Different Zn2+ Concentrations and High Hydrostatic Pressures (HHP) on Chlorophyll Stability

Evaluation and Analysis of Water Quality of Marine Aquaculture Area

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