geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Enhanced Indirect Photochemical Transformation of Histidine and Histamine through Association with Chromophoric Dissolved Organic Matter


, : Enhanced Indirect Photochemical Transformation of Histidine and Histamine through Association with Chromophoric Dissolved Organic Matter. Environmental Science & Technology 49(9): 5511-5519

Photochemical transformations greatly affect the stability and fate of amino acids (AAs) in sunlit aquatic ecosystems. Whereas the direct phototransformation of dissolved AAs is well investigated, their indirect photolysis in the presence of chromophoric dissolved organic matter (CDOM) is poorly understood. In aquatic systems, CDOM may act both as sorbent for AAs and as photosensitizer, creating microenvironments with high concentrations of photochemically produced reactive intermediates, such as singlet oxygen (1O2). This study provides a systematic investigation of the indirect photochemical transformation of histidine (His) and histamine by 1O2 in solutions containing CDOM as a function of solution pH. Both His and histamine showed pH-dependent enhanced phototransformation in the CDOM systems as compared to systems in which model, low-molecular-weight 1O2 sensitizers were used. Enhanced reactivity resulted from sorption of His and histamine to CDOM and thus exposure to elevated 1O2 concentrations in the CDOM microenvironment. The extent of reactivity enhancement depended on solution pH via its effects on the protonation state of His, histamine, and CDOM. Sorption-enhanced reactivity was independently supported by depressed rate enhancements in the presence of a cosorbate that competitively displaced His and histamine from CDOM. Incorporating sorption and photochemical transformation processes into a reaction rate prediction model improved the description of the abiotic photochemical transformation rates of His in the presence of CDOM.

US$19.90

PMID: 25827214

DOI: 10.1021/acs.est.5b00466


Other references

Palmer, P.L., 2000: AgriMet: agricultural weather and crop water use modeling in the Pacific northwest. Competition for limited water resources is increasing in the western United States. Competing and often conflicting uses include irrigated agriculture, hydroelectric generation, fish and wildlife requirements, recreation and domestic uses, and wat...

Mammone Kerry A.; Domack E.W.; McClennen Charles E., 1992: Sediment flux in an Antarctic fjord. Abstracts with Programs - Geological Society of America 24(7): 174

Dipineto, L.; Manna, L.; Baiano, A.; Gala, M.; Fioretti, A.; Gravino, A.E.; Menna, L.F., 2007: Presence of Leishmania infantum in red foxes (Vulpes vulpes) in southern Italy. Skin, lymph node (popliteal), and bone marrow samples were collected from 50 red foxes (Vulpes vulpes) from May 2004 to May 2005 in southern Italy. Samples were tested for Leishmania infantum by polymerase chain reaction (PCR). The parasite was de...

Koros, E.; Dorner-Ciossek, C., 2007: The role of glycogen synthase kinase-3beta in schizophrenia. Glycogen synthase kinase (GSK)-3beta is recognized as a ubiquitous multifunctional enzyme involved in the modulation of many aspects of neuronal function. Inhibitory control of GSK-3beta has been identified to be crucial for the phosphoinositide 3...

Friedman, D.F.; Jawad, A.F.; Martin, M.B.; Horiuchi, K.; Mitchell, C.F.; Cohen, A.R., 2003: Erythrocytapheresis to reduce iron loading in thalassemia. Iron overload is the major complication of transfusion therapy for thalassemia major. We conducted a randomized, prospective clinical trial using a crossover design to compare two methods of transfusion therapy in thalassemia major: simple transfu...

Ashby, D.; Brickell, N., 1986: PACU vignette: what would you do in this situation?. Journal of Post Anesthesia Nursing 1(4): 274-276

Lü, F.; Chen, T.; Liao, K.K.; Benditt, D.G., 2013: Surgical ablation of typical atrial flutter refractory to catheter ablation. Journal of Thoracic and Cardiovascular Surgery 145(6): E73-E75

Bent, U.; Gniffke, S.; Reinbold, W.D., 1994: An epidural hematoma following single shot epidural anesthesia. The formation of an epidural or subdural haematoma is a well-known but very rare complication when anaesthetic procedures are conducted near the spinal cord. The major reasons are impaired blood coagulation and the trauma of puncture, which repres...

Clancy, H., 1974: Whither nursing: nurse training and/or nurse education. World of Irish Nursing 3(12): 223, 225-223, 225

Estreda A.S.; Platt M.R.; Mills L.J.; Urschel H.C., 1980: Rupture of the right hemi diaphragm with liver herniation a case with extension of a tear previously undiagnosed ruptured right hemi diaphragm. Journal of Trauma 20(2): 174-176