Chia-Ying Li

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When the cost of raw materials or component parts dominates the product cost, supplier selection becomes a crucial process for the company to maintain the cost while holding the quality of the products. At the same time, it is likely that the supplier offers bundling products, strategy to get more orders from the company. In this situation, purchasing(More)
Radix Codonopsis (Dangshen) is a famous traditional Chinese medicine and has long been used for replenishing energy deficiency, strengthening the immune system, lowering blood pressure and improving appetite in China, Japan and Korea. A highly specific quantification method using (1)H NMR has been developed for the simultaneous determination of novel(More)
SUMMARY Geranyl diphosphate (GDP) is the precursor of monoterpenes, which are the major floral scent compounds in Phalaenopsis bellina. The cDNA of P. bellina GDP synthase (PbGDPS) was cloned, and its sequence corresponds to the second Asp-rich motif (SARM), but not to any aspartate-rich (Asp-rich) motif. The recombinant PbGDPS enzyme exhibits dual(More)
Simple, convenient, sensitive and accurate analytical methods are needed for the analysis of alkaloid components in Rhizoma Coptidis in traditional Chinese herbal medicine, which has important bioactivity. In the present study, a highly specific and sensitive method using (1)H NMR has been developed for the quantitative determination of protoberberine(More)
Firms invest millions of dollars in the introduction of new information systems for long-term benefit. If employees are not willing to accept a new information system, such investments may be wasted. Employee acceptance of a new information system is in part determined by external influences. However, previous research has neglected the paths of persuasive(More)
Three new coumarins, phellodenols F-H (1-3) and a new glutaric acid derivative, phellodendric acid-A (4) were isolated from the leaves of Phellodendron amurense together with twenty-nine known compounds. Extensive 1D and 2D NMR experiments and other spectroscopic studies were employed to determine the structures of 1-4. The isolated compounds were screened(More)
[(125)I]RTI-55-membrane binding assay-guided fractionation and separation of a water-soluble extract of the roots of Polygala tenuifolia gave five new oligosaccharide derivatives, polygalatenosides A-E (1-5). The structures of these new oligosaccharides were established on the basis of spectroscopic evidence. Polygalatenosides A and B (1 and 2) showed(More)
A quantitative analysis using (1)H-NMR has been developed for the determination of camptothecin derivatives and trigonelline in Nothapodytes foetida root, stems and leaves. In the region of delta 9.5-5.5, the signals of H-7 of camptothecin (1), H-10 of 9-methoxycamptothecin (2), H-19 of pumiloside (3) and H-2 of trigonelline (4), were well separated from(More)
Five new naturally occurring monoterpenoids, crocusatins-A (1), -B (2a), -C (3), -D (4a) -E (5), a new lactate, sodium (2S)-(O-hydroxyphenyl)lactate (6), and eighteen known compounds were isolated and characterized from the pollen of Crocus sativus L. The tyrosinase inhibitory activities of these compounds were also discussed.
We developed an analytical method using 1H nuclear magnetic resonance (NMR) spectrometry to resolve analytical problems with Ginkgo. After a simple hydrolysis step, an NMR analysis of the terpene trilactone H-12 signals and the flavonol aglycone H-2' (or H-2'/6' for kaempferol) signals was performed. By comparing the solvent effects on the resolution of(More)