James E. Simon
Rutgers University
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Featured researches published by James E. Simon.
Food Chemistry | 2016
Jing Zhen; Thomas S. Villani; Yue Guo; Yadong Qi; Kit L. Chin; Min-Hsiung Pan; Chi-Tang Ho; James E. Simon; Qingli Wu
A liquid chromatography-mass spectrometry method was developed for the simultaneous separation, and determination of natural compounds including phenolic acids and flavonoids in the leaves of Hibiscus sabdariffa. By analyzing the UV and MS data, and comparison with authenticated standards, 10 polyphenols including neochlorogenic acid, chlorogenic acid, cryptochlorogenic acid, quercetin, kaempferol and their glycosides were identified together with 5-(hydroxymethyl)furfural. Major constituents in the leaves of 25 different populations from worldwide accessions were quantified and compared with each other. The total phenolic content of each accession was determined using Folin-Ciocalteu assay, ranging from 18.98 ± 2.7 to 29.9 ± 0.5 mg GAE/g. Their in vitro antioxidant activities were measured by ABTS radical cation decolorization assay, varying from 17.5 to 152.5 ± 18.8 μmol Trolox/g. After the treatment of H. sabdariffa leaf extract, the reduction of LPS-induced NO production dose-dependently in RAW 264.7 cell indicates the extracts potential anti-inflammatory activity.
Journal of Food Science | 2009
H. R. Juliani; C. R. Welch; Qingli Wu; B. Diouf; D. Malainy; James E. Simon
The objectives of this study were to assess and improve the quality of the hibiscus calyces from Senegal over 2 production seasons (2004 to 2005), to develop and adapt new procedures for the determination of hibiscus anthocyanins and analysis of the 2 major ones, delphinidin-3-sambubioside and cyanidin-3-sambubioside. The foreign matter, total ashes, and acid insoluble ashes showed that the calyces harvested in 2005 were produced following hygienic practices, while the color assessment of the calyces and analysis of hibiscus active principles also showed higher amounts of anthocyanins in 2005. A protocol to measure anthocyanins by pH-differential UV-Vis spectrophotometry was adapted to measure the hibiscus anthocyanins from a water extract. The spectrophotometric method for quantitation of total anthocyanins showed a close correlation (r(2)= 0.82) when compared with the HPLC method, suggesting the use of the colorimetric method in quality control programs as an affordable alternative method to assess anthocyanin content in hibiscus. New and raised standards for the cleanliness and active principle content in hibiscus are also proposed. This study demonstrated that the implementation of a quality control program and the application of agricultural good practices in the production and processing of hibiscus calyces can lead to higher quality natural plant products.
Archive | 2013
Tom Villani; H. Rodolfo Juliani; James E. Simon; Qingli Wu
Archive | 2013
H. Rodolfo Juliani; James E. Simon; Chi-Tang Ho
Archive | 2010
Michel Ratsimbason; Lalasoa Ranarivelo; H. Rodolfo Juliani; James E. Simon
Archive | 2009
H. Rudolfo Juliani; James E. Simon; Chi-Tang Ho
한국작물학회 학술발표대회 논문집 | 2009
Kwan-Su Kim; Sang-Huk Park; James E. Simon
Archive | 2009
A. Ariyawardana; Ramu Govindasamy; James E. Simon
Archive | 2017
Kit L. Chin; Yadong Qi Adolfo Pertuz Julia Coppin QingLi Wu; James E. Simon
Archive | 2013
H. Rodolfo Juliani; James E. Simon; Chi-Tang Ho