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Pichiah Saravanan,Yee Li Kang,Mei Yi Poon,Purushothaman Monash,Shaliza Ibrahim 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.10
A detailed surface characterizations and adsorption mechanism of Cd2+ on chemical activated carbon (CAC)prepared from Garnicia mangostana shell were investigated. The activation is accomplished in self-generating atmosphere using phosphoric acid as activating agent. The characterizations performed are elemental analysis, functional group identification, N2 adsorption isotherm and surface charges. Adsorption mechanism of metal ion was tested using Cd2+ as model ion. CAC achieved BET surface area of 1,498 m2/g with a mixture of micro and mesopores. The point of zero charge is observed to be at pH 2.8 and the optimum pH for Cd2+ adsorption on CAC is 12. The adsorption isotherm followed the Freundlich model, and the adsorption kinetics was explained by pseudo-second order kinetic model. From thermodynamic studies, the adsorption was found to be physical adsorption. X-ray photoelectron spectroscopy (XPS) confirmed the adsorption of Cd2+ onto CAC as +2 oxidation state.
Pichiah, PB Tirupathi,Cha, Youn‐,Soo John Wiley Sons, Ltd 2015 Journal of the Science of Food and Agriculture Vol.95 No.15
<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P>Foods that are rich in fat and or sodium chloride promote obesity and associated diseases, whereas intake of dietary fiber averts obesity development. <I>Salicornia herbacea</I> (SH) is a rich source of dietary fiber and high in sodium chloride; therefore, we investigated whether replacing common salt with SH in a high‐fat diet could prevent obesity development.</P><P><B>RESULTS</B></P><P>Mice were divided into five groups: group ND was fed a normal diet, group HD was fed a high‐fat diet, group HD‐NaCl was fed a high fat diet with sodium chloride 10 g kg<SUP>−1</SUP>, group HD‐CL was fed a high‐fat diet with cellulose 30 g kg<SUP>−1</SUP> and group HD‐SH was fed a high‐fat diet with SH powder 50 g kg<SUP>−1</SUP>. The amount of sodium chloride and cellulose added in the respective diet was equivalent to their amount in SH. Data from our study showed that, SH supplementation significantly decreased body weight gain, liver weight, hepatic triglyceride, serum leptin and insulin, along with the mRNA level of key lipid anabolic genes such as SREBP‐1c, PPARγ and FAS compared to the HD group.</P><P><B>CONCLUSION</B></P><P>The results of this study demonstrated that SH is a potential natural anti‐obesity agent that can be used in place of sodium chloride. © 2014 Society of Chemical Industry</P>
Pichiah Saravanan,Kannan Pakshirajan,Prabirkumar Saha 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.7
Growth profile of predominantly Pseudomonas species was studied using wastewater containing phenol and m-cresol, as single and multi component systems in an internal loop airlift bioreactor (ILALR). The species utilized for the study was isolated from a wastewater treatment plant. The reactor was operated at both lower and higher hydraulic retention time (HRT_s), 4.1 h and 8.3 h, respectively. The inlet phenol and concentration was varied between 100 and 800 mg/L with 800 mg/L as shock loading concentration for an HRT of 8.3 h. For 4.1 h HRT, the concentration was varied 100 and 500 mg/L using 500 mg/L as a shock loading concentration. The study showed complete degradation of both phenol and m-cresol, when present individually at an HRT of 8.3 h with an enriched biomass output. The specific growth rate of the culture at various phenol and m-cresol concentrations was fitted to a Monod model. The biokinetics value showed good potential of Pseudomonas species employing the internal loop air lift bioreactor in utilizing high strength phenolics containing wastewater. Culture growth profile with both phenol and m-cresol as mixtures also showed decreased lag times with complete utilization of the phenolics.
PB Tirupathi Pichiah,조석호,한성규,차연수 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.4
Dietary fiber and proteins are individually known to decrease feeding, but could result greater weight management benefit when both are combined. We hypothesized that supplementing the diet with fermented barley, being rich in both dietary fiber and proteins, could lower energy intake by modulating the mRNA expression level of hypothalamic genes associated with the regulation of feeding behavior and satiety; thereby decreasing body weight gain. To test our hypothesis, four groups of Sprague Dawley rats were arranged in a 2 × 2 factorial design (n = 6), low-fat diet with either guar gum (LFD-G) or fermented barley (LFD-FB) and high-fat diet with either guar gum (HFD-G) or fermented barley (HFD-FB). Using oral gavage, fermented barley was given at a dosage of 1500 mg/kg body weight and guar gum was supplemented in an equivalent quantity to that of the fiber in the fermented barley. After 19 weeks, the fermented barley-supplemented groups showed a significant reduction in energy intake, triglyceride, body weight gain, and serum leptin, compared to the guar gum-supplemented groups in both the low- and high-fat diet groups. Likewise, the anorexigenic gene proopiomelanocortin (POMC) and cocaine and amphetamine-regulated transcript (CART) mRNA level were significantly higher in the fermented barley-supplemented groups compared to the guar gum-supplemented groups in rats fed on both high- and low-fat diets. In conclusion, fermented barley supplementation upregulated hypothalamic POMC/CART, decreased energy intake in both low- and high-fat diet groups, and prevented excessive weight gain in rats.
Hyun-Ju Kang,Pichiah Balasubramanian Tirupathi Pichiah,RAVICHANDRAN VIJAYA ABINAYA,Hee-Sook Sohn,Youn-Soo Cha 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.3
Onion peel (OP) extract is known as a rich source of flavonoids, mainly quercetin. We hypothesized that OP has hypocholesterolemic effects. To investigate the effect of OP, C57BL/6J mice were divided into 4 dietary groups (n=10); normal diet (ND); high cholesterol diet (HC); and high cholesterol diet with 100 or 200 mg OP extract (OP-100 or OP-200, respectively) per kg of body weight. After 12 weeks, lower values of liver weight, serum total cholesterol levels, LDL cholesterol, atherogenic index, cardiac risk factor, hepatic triacylglycerol, and total cholesterol, and higher fecal cholesterol levels were observed in the OP-200 than in the HC group. The hepatic mRNA expression levels of low-density lipoprotein receptors (LDL-R) and cholesterol 7-alpha-monooxygenase (CYP7A1) were high in the OP-200 compared to the HC group. These observations suggest that OP promoted lowering of serum and hepatic cholesterol in mice primarily via fecal excretion.
Wong, Kien Tiek,Saravanan, Pichiah,Nah, In Wook,Choi, Jaeyoung,Park, Chulhwan,Kim, Namchan,Yoon, Yeomin,Jang, Min Elsevier 2019 CHEMOSPHERE - Vol.218 No.-
<P><B>Abstract</B></P> <P>In this study, magnetic layered double hydroxides (mag-LDHs) were synthesized through compositing magnetite with three different metals (Mg, Cu and Al) under ultrasound (US, 100 kHz frequency and 50 W power). For the first time, mag-LDHs were applied to sonocatalytic reduction of nitrate (NO<SUB>3</SUB> <SUP>−</SUP>) and the reduction mechanism were determined by conducting kinetic tests and various spectroscopic analyses. Based on the kinetic data, NO<SUB>3</SUB> <SUP>−</SUP> reduction and the selectivity for N<SUB>2</SUB> highly depends on the ratio between Mg/Al, solution pH and sonication frequency. The best condition for sonocatalytic denitrification was found to be pH 7 operated under 100 kHz (50% power) using the catalyst with lowest amount of Al (mag-LDH-Al<SUB>0.3</SUB>Mg<SUB>1.5</SUB>). As a proposed mechanism, NO<SUB>3</SUB> <SUP>−</SUP> is initially reduced to NO<SUB>2</SUB> <SUP>−</SUP> by Cu<SUP>0</SUP>, and then further reduced to N<SUB>2</SUB>/NH<SUB>4</SUB> <SUP>+</SUP> by Mg<SUP>0</SUP>. Hypothetically Al<SUP>0</SUP> could provide sorption sites for hydrogen radicals (·H) dissociated from ultrasound, hence served as reducing sites in denitrification process. The XPS analysis showed an increased peak of Cu<SUP>0</SUP> after the sonocatalytic reduction when catalyst has lower amount of Al. The excessive hydrogen adsorbed on Al<SUP>0</SUP> might spill-over to the adjacent Cu, thus reducing the CuO into Cu<SUP>0</SUP> at high temperature created by the implosion of the microbubbles. Without the use of consumable reducing agents (i.e. H<SUB>2</SUB> gas), sonocatalytic reduction could be a potential candidate of remediation method to treat NO<SUB>3</SUB> <SUP>−</SUP> polluted water with high N<SUB>2</SUB> selectivity and easy magnetic recovery.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sonocatalytic reduction of NO<SUB>3</SUB> <SUP>−</SUP> was studied for the first time. </LI> <LI> Magnetically separable Mag-LDH was synthesized via ultrasound irradiation. </LI> <LI> Denitrification occurs without reducing chemicals. </LI> <LI> High selectivity for N<SUB>2</SUB> was achieved by mag-LDH under sonication. </LI> <LI> Solution pH and percentage of Mg play an important role in denitrification. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Vitamin D and Metabolic Diseases: Growing Roles of Vitamin D
박정은,P.B. Tirupathi Pichiah,차연수 대한비만학회 2018 The Korean journal of obesity Vol.27 No.4
Vitamin D, a free sunshine vitamin available for mankind from nature, is capable to avert many health-related critical circumstances. Vitamin D is no more regarded as a nutrient involved in bone metabolism alone. The presence of vitamin D receptor in a number of tissues implies that vitamin D has various physiological roles apart from calcium and phosphorus metabolism. Low serum vitamin D has been found to be associated with various types of metabolic illness such as obesity, diabetes mellitus, insulin resistance, cardiovascular diseases including hypertension. Various studies reported that vitamin D insufficiency or deficiency in linked with metabolic syndrome risk. This review focuses on various metabolic diseases and its relationship with serum vitamin D status.
Duraisamy Kalpana,이양수,Krishnamoorthy Srikanth,PB Tirupathi Pichiah,차연수 한국고분자학회 2014 Macromolecular Research Vol.22 No.5
The cultural filtrates of Klebsiella pneumoniae cultured under normal gravity and low shear modeledmicrogravity were potentially used to biosynthesize gold nanoparticles using the precursor gold III chloride trihydrate. The gold nanoparticles produced were spherical, of size between 16-36 and 24-50 nm with the cultural filtratesof normal and low shear modeled microgravity respectively. The characteristic plasmon resonance of gold nanoparticlesoccurred between 535-550 nm in the spectral analysis. XRD reflections (1 1 1), (2 0 0), (2 2 0), (3 1 1) indicatethe face centered cubic and crystalline nature of the biosynthesized gold nanoparticles. The FTIR study proposesthat proteins excreted into the cultural filtrate were involved in the synthesis and stabilization of gold nanoparticles. The in vitro cytotoxicity on 3T3L1, H9c2 and HepG2 cell lines showed the nontoxic and biocompatible nature ofbiosynthesized gold nanoparticles.