Author
Duduku Krishnaiah
Other affiliations: Information Technology University
Bio: Duduku Krishnaiah is an academic researcher from Universiti Malaysia Sabah. The author has contributed to research in topics: Adsorption & Activated carbon. The author has an hindex of 21, co-authored 94 publications receiving 3058 citations. Previous affiliations of Duduku Krishnaiah include Information Technology University.
Papers published on a yearly basis
Papers
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TL;DR: The literature reveals that these natural antioxidants represent a potentially side effect-free alternative to synthetic antioxidants in the food processing industry and for use in preventive medicine.
861 citations
TL;DR: This paper focuses on CVD techniques, activated carbon support and sonication of TiO(2) photocatalyst used in a variety of investigations, i.e. water decontamination, pollutant degradation in aqueous and gas phase systems using UV irradiation and lately with the assistance of ultrasonic sound waves.
401 citations
TL;DR: Qualitative analysis carried out on each plant shows that tannins, saponins, flavonoids, terpenoids and alkaloids were present in all the plants, and the significance of the phytochemical constituents with the respect to the role of these plants in traditional medicine treatment is discussed.
Abstract: Tannins, phlobatannins, saponins, flavonoids, terpenoids, cardiac glycosides and alkaloids distribution in six Malaysian medicinal plants, where each medicinal plant belongs to different families were examined and compared. The plants used areAzadirachta indica, Centella asiatica, Emblica officinalis, Hibiscus rosa-sinensis, Imperata cylindrica, and Moringa oleifera. Qualitative analysis carried out on each plant shows that tannins, saponins, flavonoids, terpenoids and alkaloids were present in all the plants. Phlobatannins were found to be present in C. asiatica andM. oleifera only and were absent in the rest of the plants. Cardiac glycosides were present in A. indica, C. asiatica and I. cylindrica and found to be absent in E. officinalis, H. rosa-sinensis and M. oleifera. The significance of the phytochemical constituents with the respect to the role of these plants in traditional medicine treatment is discussed.
Key words: Medicinal plants, traditional medicine, phytochemical constituents.
294 citations
TL;DR: The sonophotocatalysis process has a futuristic application from an engineering and fundamental aspect in commercial applications and is an excellent opportunity to reduce reaction time and the amount of reagents used without the need for extreme physical conditions.
289 citations
DOI•
30 Sep 2007TL;DR: A review has been done on the effect of oxidants on human health and their neutralization by natural antioxidants, major natural antioxidants and their plant sources, different recovery processes for antioxidants from plant matrices and the advantage of indirect supercritical fluid extraction over other processes are presented.
Abstract: Oxidants or reactive oxygen species are produced in our body during aerobic metabolism leading to many diseases such as cancer, cardiovascular diseases etc. Antioxidants are the chemicals that neutralize these oxidants. Natural antioxidants are the secondary metabolites of phytochemicals and are preferred over synthetic antioxidants, which are found to impose side effects. A review has been done on the effect of oxidants on human health and their neutralization by natural antioxidants. Major natural antioxidants and their plant sources, different recovery processes for antioxidants from plant matrices and the advantage of indirect supercritical fluid extraction over other processes are presented.
Key words: Free radical, secondary metabolites, oxidative stress, recovery processes, process parameters.
243 citations
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TL;DR: The findings revealed that various parameters, such as the initial pH of the solution to be degraded, oxidizing agents, temperature at which the catalysts must be calcined, dopant(s) content and catalyst loading exert their individual influence on the photocatalytic degradation of any dye in wastewaters.
1,576 citations
TL;DR: Advanced oxidation processes (AOPs) constitute important, promising, efficient, and environmental-friendly methods developed to principally remove persistent organic pollutants (POP) from waters and wastewaters.
Abstract: Advanced oxidation processes (AOPs) constitute important, promising, efficient, and environmental-friendly methods developed to principally remove persistent organic pollutants (POPs) from waters and wastewaters. Generally, AOPs are based on the in situ generation of a powerful oxidizing agent, such as hydroxyl radicals (•OH), obtained at a sufficient concentration to effectively decontaminate waters. This critical review presents a precise and overall description of the recent literature (period 1990–2012) concerning the main types of AOPs, based on chemical, photochemical, sonochemical, and electrochemical reactions. The principles, performances, advantages, drawbacks, and applications of these AOPs to the degradation and destruction of POPs in aquatic media and to the treatment of waters and waste waters have been reported and compared.
1,550 citations
TL;DR: The mechanism of action of the natural antioxidant compounds and assays and their reaction mechanisms can help in evaluating the antioxidant activity of various antioxidant compounds as well as in the development of novel antioxidants.
Abstract: The normal biochemical reactions in our body, increased exposure to the environment, and higher levels of dietary xenobiotic's result in the generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS). The ROS and RNS create oxidative stress in different pathophysiological conditions. The reported chemical evidence suggests that dietary antioxidants help in disease prevention. The antioxidant compounds react in one-electron reactions with free radicals in vivo/in vitro and prevent oxidative damage. Therefore, it is very important to understand the reaction mechanism of antioxidants with the free radicals. This review elaborates the mechanism of action of the natural antioxidant compounds and assays for the evaluation of their antioxidant activities. The reaction mechanisms of the antioxidant assays are briefly discussed (165 references). Practical applications: understanding the reaction mechanisms can help in evaluating the antioxidant activity of various antioxidant compounds as well as in the development of novel antioxidants.
1,391 citations
TL;DR: In this paper, a review of the literature on nanocarbon-TiO2 photocatalysts is presented, highlighting recent progress in the development of carbon dioxide photocatalyst.
1,075 citations
TL;DR: This review discusses recent research developments of VOC adsorption onto a variety of engineered carbonaceous adsorbents, including activated carbon, biochar, activated carbon fiber, carbon nanotube, graphene and its derivatives, carbon-silica composites, ordered mesoporous carbon, etc.
915 citations