I will hold "virtual" office hours on Monday, Wednesday, Friday 11 am - 1 pm.,
and Thursday 12-2 pm C.S.T. During "virtual" office hours, you can reach me
using the chat function in Western Online I would like to limit 8 students during
each office hour session.
For students who want to use Skype audio or video chat, you must request
(E-mail) at least two days earlier. Email is the best and fastest way to reach me.
You can always E-mail me for any questions. Typically I will respond within 24
hours to most questions.
M.S. Environmental Toxicology, Texas Tech University, Lubbock, TX 2006
M.S. Analytical Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy
B.S. Chemical Education, Yanbei Normal College, Shanxi, China 1999
Ph.D. Analytical Chemistry, University of South Carolina, Columbia, SC, 2009
Chemistry 551 Forensic analytical chemistry
Chemistry 580 Graduate seminar
Chemistry 451 Applications of forensic chemistry
Chemistry 452 Forensic toxicology and DNA analysis
Chemistry 440 Elementary forensic techniques
Chemistry 101 General chemistry
Forensic Chemistry, General Chemistry
Trace evidence analysis
Dr. Guan has wide ranging research interests in forensic, environmental, and analytical chemistry, especially
in analytical method development and validation using chromatography and mass spectrometry. Her recent
research has focused on sample preparation and analysis of drugs of abuse, pharmaceuticals, pesticides,
gunshot residue, explosives, food adulterants, and toxins.
Guan, H.; Brewer, W. E.; Morgan, S. L. "Disposable pipette extraction for the analysis of pesticides in fruit and
vegetables using gas chromatography mass spectrometry" Journal of Chromatography A 2010, 1217 (12), 1867-1874
Guan, H.; Brewer, W. E.; Garris, S. T.; Craft, C.; Morgan, S. L. "Multi-residue Analysis of Pesticides in Fruits and
Vegetables Using disposable Pipette Extraction (DPX) and Micro-Luke Method." Journal of Agricultural and Food
Chemistry 2010, 58 (10), 5973-5981
Guan, H.; Brewer, W. E.; Morgan, S. L. "New Approach to Multi-residue Pesticide Determination in Foods with High
Fat Content Using Disposable Pipette Extraction (DPX) and Gas Chromatography-Mass spectrometry (GC-MS),
" Journal of Agricultural and Food Chemistry 2009, 57 (22), 10531-10538.
Afriyie-Gyawu, E.; Wang, Z.; Ankrah, N. A.; Xu, L.; Johnson, N. M.; Tang, L.; Guan, H.; Phillips, T. D. "Novasil Clay
Does not Affect The Concentrations Of Vitamins A And E And Nutrient Minerals In Serum Samples From Ghanaians
At High Risk For Aflatoxicosis," Food Additives and Contaminants 2008, 25 (7), 872-884
Tang, L.; Guan, H.; Ding, X, Wang, J. S. "Modulation of Afflation Toxicity and Biomarkers by Lycopene in F344 Rats,
" Toxicology and Applied Pharmacology 2007, 219(1), 10-17.
Billam, M.; Tang, L.; Cai, Q.; Mukhi, S.; Guan, H.; Wang, P.; Wang, Z.; Theodorakis, C. W.; Kendall, R. J.; Wang, J. S.
"Seasonal Variations in the concentration of Microcystin-LR in Two Lakes in Western Texas, USA," Environmental
Wang, J. S.; Luo, H. Billam, M.; Wang, Z.; Guan, H.; Tang, L.; Goldston, T.; Afriyie-Gyawu, E.; Lovett, C.; Griswold,
J.; Brattin, B.; Taylor, R. J.; Huebner, H. J.; Phillips, T. D. "Short-term Safety Evaluation of Processed Calcium
Montmorillonite Clay (NovaSil) in Humans," Food Additives and Contaminants 2005, 22(3), 270-279
Afriyie-Gyawu, E.; Mackie, J.; Dash, B.; Wiles, M.; Taylor, J.; Heubner, H.; Tang, L.; Guan, H.; Wang, J.S.; Philips
T. D. "Chronic Toxicological evaluation of dietary NovaSil clay in Sprague-Dawley rats," Food Additives and
Contaminants 2005, 22(3), 259-269.