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Singlet oxygen

Tìm thấy 14+ kết quả cho từ khóa "Singlet oxygen"

An exploration of new avenues regarding deep tissue penetration and higher singlet oxygen efficiencies: novel near-IR photosensitizers for photodynamic therapy

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The singlet oxygen generation experiments revealed that compounds 6 and 7, with high singlet oxygen quantum yields (0.52 and 0.93, respectively), were excellent and promising candidates for photodynamic therapy. The singlet oxygen quantum yield of 0.93 was the highest reported value so far for BODIPY-based photosensitizers..

Singlet oxygen generation from poly[4-diacetoxyiodo]styrene and hydrogen peroxide

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Generation of singlet oxygen in organic media.. Preparation of PDAIS (2b).

Synthesis, characterization, and investigation of singlet oxygen, DNA interaction, and topoisomerase I inhibition properties of novel zinc(II) phthalocyanine

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Singlet oxygen quantum yield (Φ Δ. Singlet oxygen quantum yield. determinations were carried out using the experimental set-up described in the literature [1].

Novel BODIPY-bridged cyclotriphosphazenes

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Parameters for singlet oxygen. Singlet oxygen ( Φ. The intensity of singlet oxygen formation was obtained according to Eq.. Singlet oxygen quantum yields of compounds 4–6 and 4P–6P were determined by employing DPBF as a trap molecule and methylene blue (MB) as a reference. Singlet oxygen generations were monitored by the decrease in absorbance of DPBF.

Investigation of photochemical and photophysical properties of novel silicon(IV) phthalocyanines and their µ-oxo dimers

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Electronic absorption spectral changes for DPBF during the determination of singlet oxygen quantum yield in DMF.. Electronic absorption spectral changes for compound 3a during the determination of singlet oxygen quantum yield in DMF at a concentration of 1×10 -5 M.. Electronic absorption spectral changes for compound 3b during the determination of singlet oxygen quantum yield in DMF at a concentration of 1×10 -5 M..

Synthesis, characterization, and photophysical and photochemical properties of 3-(4-phenyloxy)coumarin containing metallo- and metal-free phthalocyanines

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Theoretical information is given about photochemical measurements (singlet oxygen generation) in the literatu- re.

Synthesis and spectral and thermal characterization of new metal-free and metallophthalocyanines: investigation of their photophysical, photochemical, and thin film properties

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In this study, the metal-free (2) and zinc (3) phthalocyanine compounds’ singlet oxygen quantum yields ( Φ. Five factors are responsible for the magnitude of the determined quantum yield of singlet oxygen. These are ability of substituents, triplet excited state energy, triplet excited state lifetime, solvents, and the efficiency of the energy that is transferred between the ground state and the triplet excited state of oxygen.

Chapter 057. Photosensitivity and Other Reactions to Light (Part 6)

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The mechanism of porphyrin photosensitization is known to be photodynamic, or oxygen-dependent, and is mediated by ROS such as singlet oxygen and superoxide anions.

Boron-containing tetrapyrroles

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PDT is a minimally invasive treatment that destroys target cells in the presence of oxygen when light irradiates a photosensitizer, generating highly reactive singlet oxygen.

A phthalocyanine–fluorescein conjugate

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The effect of the presence of the fluorescein on the singlet oxygen generation as well as on biological photodynamic activity is currently under investigation

Transcriptomic analyses of cacao flavonoids produced in photobioreactors

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Indeed, the strong and exclusive upregulation of SOD in the transcriptome under white light suggested the catalysis of singlet oxygen, a ROS signal promoting the flavonoid biosynthesis [45]. In the shift to blue light exposure (d14-VS-d15), a slight increase of PA content was evidenced concomi- tantly with the enrichment of the circadian rhythm and plant hormone signaling pathways.

Nhóm 8 Ph i s y th c ph m Đánh giá c m quan th c ph m khúc x ánh sáng và cách xác đ nh ch s ánh sáng

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Các chất quang mẫn (P) khi bị kích hoạt có thể chuyển năng lượng cho O2để làm ra oxygene đơn - singlet oxygen. Ánh sáng P. P + O 2 Oxygenđơn là chất có hoạt tính rất mạnh, là chất oxy hóa mạnh có thể phá hủy nhanh chóng tế bào, chúng cũng là nhân tố chủ yếu được các đại thực bào (phagocytes) dùng để diệt khuẩn.

Synthesis and effect of substituent position, metal type on the electrochemical properties of (3-morpholin-4-ylpropoxy) groups substituted cobalt, manganese phthalocyanines

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Synthesis and investigation of photophysicochemical properties of novel ketone-substituted gallium (III) and indium (III) phthalocyanines with high singlet oxygen yield for photodynamic therapy. Journal of Luminescence 2017. Journal of Electroanalytical Chemistry 2019. Journal of Solid State Electrochemistry 2016. The synthesis and electrochemical behaviour of water soluble manganese phthalocyanines: Anion radical versus Mn(I) species. European Journal of Medicinal Chemistry 2016.

Comparative analyses of the variation of the transcriptome and proteome of Rhodobacter sphaeroides throughout growth

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These environments are subject to frequent changes, and this is reflected in the flexibility of R. sphaeroides uses aerobic respiration for ATP production in the presence of sufficient oxygen levels.. Since the simultaneous presence of light, oxygen and bacteriochlo- rophyll leads to photooxidative stress by the generation of the harmful singlet oxygen, the bacteria try to avoid this situation by repressing photosynthesis gene expres- sion in the presence of light and oxygen [11, 12].

Synthesis and spectroscopic characterization of new phthalocyanine derivatives: application as photocatalysts for the degradation of Orange G

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Singlet oxygen quantum yield determination. The singlet oxygen ( 1 O 2 ) quantum yields Φ ∆ for 2b, 2c, and 2d were determined using the literature method [9,18,21] and applying the following equation:. where Φ Std ∆ is the singlet oxygen quantum yield of the standard ZnPc, and R and R std are the photodegradation rates of the singlet oxygen quencher DPBF in the presence of the samples (2b, 2c, and 2d) and the standard, respectively.

Diphenylethoxy-substituted metal-free and metallophthalocyanines as potential photosensitizer for photodynamic therapy: synthesis and photophysical and photochemical properties

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Singlet oxygen quantum yields. determinations were performed as described in the literature. 35,36 Typically, a 3-mL portion of the phthalocyanine derivatives (absorbance. 1.5 at irradiation wavelength) containing the singlet oxygen quencher was irradiated in the Q band region with the photoirradiation set-up described in the literature. 35,36 Singlet oxygen quantum yields ( Φ.

Newly synthesized peripherally octa-substituted zinc phthalocyanines carrying halogen terminated phenoxy-phenoxy moiety: Comparative photochemical and photophysical features

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Singlet oxygen quantum yields.

Investigation of the photophysical and photochemical behavior of substituted zinc phthalocyanines and their water-soluble quaternized derivatives

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Singlet oxygen quantum yield (Φ Δ ) determinations were carried out using the experimental set-up described above in the literature. 8,9 Typically, a 3-mL portion of the respective unsubstituted, nonperipheral, and peripheral tetrasubstituted zinc(II) phthalocyanine (6–9) solutions (C M) containing the singlet oxygen quencher was irradiated in the Q band region with the photo-irradiation set-up described in the references.

Novel nonperipheral octa-3-hydroxypropylthio substituted metallo-phthalocyanines: Synthesis, characterization, and investigation of their electrochemical, photochemical and computational properties

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Singlet oxygen production determinations were carried out using the experimental set-up described in the literature [S4].. Typically, a 3 mL portion of the respectively substituted zinc(II) phthalocyanine (7) solution (concentration M) containing the singlet oxygen quencher was irradiated in the Q band region with the photo-irradiation set-up described in the reference [S4].

Water-soluble phthalocyanines containing azo dye; microwave-assisted synthesis and photochemical properties of ZnPcs

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Singlet oxygen quantum yields of the zinc phthalocyanines (2d, 3d, 5d, and 6d) were and 0.46, respectively.. Water-soluble Pcs are the favored agents as photosensitizer in photodynamic therapy (PDT), because of their solubility in the blood stream, strong absorption in the visible region of the spectrum, and excellent photophysical properties. The synthesis scheme of the new water soluble metallophthalocyanines (M: Co, Ni, Cu, Zn) substituted with azo dye can be seen in Figures 1–4.