Photolysis of p-benzoquinone and p-chloranil in aqueous sodium sulfite solution

Иванов, В. Л.; Lyashkevich, S. Yu.

doi:10.1134/s0018143911030064

Cited by 6 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most common chemical degradation processes of chlorinated phenols are the photo-dissociation [14], the photo-isomerization [15], the photo-substitution [16], the photo-rearrangement [17], the photo-oxidation [18], [19], [20] and the photo-reduction [21]. Despite being recalcitrant, chlorophenols can be degraded by fungi [1], [2], [3], [22] and bacteria [23], [24], [25].…”

Section: Introductionmentioning

confidence: 99%

“Rational” Management of Dichlorophenols Biodegradation by the Microalga Scenedesmus obliquus

Papazi

Kotzabasis

2013

PLoS ONE

View full text Add to dashboard Cite

The microalga Scenedesmus obliquus exhibited the ability to biodegrade dichlorophenols (dcps) under specific autotrophic and mixotrophic conditions. According to their biodegradability, the dichlorophenols used can be separated into three distinct groups. Group I (2,4-dcp and 2,6 dcp – no meta-substitution) consisted of quite easily degraded dichlorophenols, since both chloride substituents are in less energetically demanding positions. Group II (2,3-dcp, 2,5-dcp and 3,4-dcp – one meta-chloride) was less susceptible to biodegradation, since one of the two substituents, the meta one, required higher energy for C-Cl-bond cleavage. Group III (3,5-dcp – two meta-chlorides) could not be biodegraded, since both chlorides possessed the most energy demanding positions. In general, when the dcp-toxicity exceeded a certain threshold, the microalga increased the energy offered for biodegradation and decreased the energy invested for biomass production. As a result, the biodegradation per cell volume of group II (higher toxicity) was higher, than group I (lower toxicity) and the biodegradation of dichlorophenols (higher toxicity) was higher than the corresponding monochlorophenols (lower toxicity). The participation of the photosynthetic apparatus and the respiratory mechanism of microalga to biodegrade the group I and the group II, highlighted different bioenergetic strategies for optimal management of the balance between dcp-toxicity, dcp-biodegradability and culture growth. Additionally, we took into consideration the possibility that the intermediates of each dcp-biodegradation pathway could influence differently the whole biodegradation procedures. For this reason, we tested all possible combinations of phenolic intermediates to check cometabolic interactions. The present contribution bring out the possibility of microalgae to operate as “smart” bioenergetic “machines”, that have the ability to continuously “calculate” the energy reserves and “use” the most energetically advantageous dcp-biodegradation strategy. We tried to manipulate the above fact, changing the energy reserves and as a result the chosen strategy, in order to take advantage of their abilities in detoxifying the environment.

show abstract

Section: Introductionmentioning

confidence: 99%

“Rational” Management of Dichlorophenols Biodegradation by the Microalga Scenedesmus obliquus

Papazi

Kotzabasis

2013

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…The absorption spectrum of p -benzoquinone showed a peak at 245 nm (Figure ). Under UV exposure, the 245 nm absorbance decreased with a slight red shift, while a broad band around 290 nm increased, mainly because of the formation of hydroquinone as a photoproduct . 5- H - p -NQ had a broad absorption in the UV and visible region centered, respectively, at 252 and 425 nm and a shoulder around 340 nm (Figure ).…”

Section: Resultsmentioning

confidence: 98%

“…Under UV exposure, the 245 nm absorbance decreased with a slight red shift, while a broad band around 290 nm increased, mainly because of the formation of hydroquinone as a photoproduct. 47 5-H-p-NQ had a broad absorption in the UV and visible region centered, respectively, at 252 and 425 nm and a shoulder around 340 nm (Figure 4). There was no significant change in the absorbance when irradiated with UV light, in agreement with the unchanged radical scavenging ability (Table 2).…”

Section: Journal Of Agricultural and Food Chemistrymentioning

confidence: 99%

Mechanism for Inhibition of Folic Acid Photodecomposition by Various Antioxidants

Wusigale

Cheng

et al. 2019

J. Agric. Food Chem.

View full text Add to dashboard Cite

Folic acid, a synthetic form of folate, is a water-soluble vitamin that is essential during periods of rapid cell division and growth. However, it decomposes upon ultraviolet irradiation to form inactive photoproducts. In this study, the protective effect and mechanisms of antioxidants, including cinnamic acids, flavonoids, catechol and its derivatives, stilbenes, p-benzoquinone and its derivatives, isoprenoids, curcumin, oleic acid, and linoleic acid, against folic acid photodecomposition were investigated by using fluorescence and absorbance spectroscopy, high-performance liquid chromatography, and antioxidant assay. It was found that antioxidants could inhibit or delay the folic acid decomposition in varying degrees, among which caffeic acid was the most effective. The increase in its remarkable antioxidant efficiency and absorbance in the UVA region during irradiation contributed to its effective protection. This finding could be useful for the protection of photolabile components in food and other uses.

show abstract

Photochemistry of aromatic compounds

Mizuno

2012

Photochemistry

View full text Add to dashboard Cite

show abstract

Photolysis of p-benzoquinone and p-chloranil in aqueous sodium sulfite solution

Cited by 6 publications

References 12 publications

“Rational” Management of Dichlorophenols Biodegradation by the Microalga Scenedesmus obliquus

“Rational” Management of Dichlorophenols Biodegradation by the Microalga Scenedesmus obliquus

Mechanism for Inhibition of Folic Acid Photodecomposition by Various Antioxidants

Photochemistry of aromatic compounds

Contact Info

Product

Resources

About