A Fourier transform infrared spectrophotometric method was described for the determination of quartz, mica(sericite) and feldspar(potassium feldspar) in respirable dust in Taebaek area. The results were as follows; 1) The concentration of minerals were determined from the intensity of absorption peak of quartz at 799 cm-1, sericite at 539 cm-1, and potassium feldspar at 648 cm-1 respectively. 2) The precision(C. V. %) for the quartz determination was 7.70+/-2.68 % from 10 to 200 microgram of quartz. 3) The precision for the sericite determination was 16.34+/-6.82 % from 30 to 500 microgram of serictite. 4) The precision for the potassium feldspar determination was 5.28+/-1.74 % from 30 to 500 microgram of potassium feldspar. 5) The concentration of respirable dust in Taebaek area was 4.90+/-3.29 mg/m3(0.4-93.7%), percent quartz was 1.80+/-4.14% (0.01-20.56%), percent sericite was 11.37+/-6.43% (0.00-29.69%), percent potassium feldspar was 8.15 % (n=7, 3.41-19.70%). 6) The difference of respirable coal dust, quartz, and sericite concentration in drilling, coal cutting, hauling and separating was significant respectively (p<0.05).
Absorption ; Coal ; Dust* ; Fourier Analysis* ; Minerals ; Potassium ; Quartz* ; Spectrophotometry, Infrared*

PURPOSE: Hepatolithiasis is a recurrent disease and common in Far East Asia. In Korea, almost all intrahepatic duct (IHD) stones were pigment stones 30~40 years ago. The nationwide cooperative study showed a higher cholesterol content of IHD stones compared to the previous data. Some reports have shown a close relationship between urbanization and the cholesterol content of stones. The purpose of this study was to evaluate the cholesterol content of IHD stones in the West Gyeongnam region and evaluate the associated clinical and demographic variables. METHODS: The IHD stones were removed surgically from twenty patients who had hepatolithiasis between July 2005 and April 2007. The stones were grouped by their gross findings. The cholesterol contents were measured quantitatively by infrared spectrophotometry and compared with the clinical variables. RESULTS: Among twenty patients, 19 had pigment stones and only one had gross evidence of a cholesterol stone. The cholesterol content of the stones were 30%~50% in 13 patients, 50~70% in 6 patients and over 70% in one patient. In urban patients, the cholesterol contents of the IHD stones were higher (567.029 mg/g) than in rural patients (421.822 mg/g)(p<0.05). All stones in rural patients were pigment stones; the stones of urban patients consisted of 5 pigment, 6 mixed and 1 cholesterol stone (p<0.05). CONCLUSION: The mean cholesterol content of the IHD stones was 508.946 mg/g; the content of the stone was significantly related to the residence of the patients. These results suggest that the cholesterol content of IHD stones are likely to increase in West Gyeongnam as urbanization increases.
Asia ; Cholesterol* ; Far East ; Humans ; Korea ; Spectrophotometry, Infrared ; Urbanization

In order to investigate working conditions of underground coal mines, this work was undertaken to evaluate the respirable dust and the concentration of quartz in Taeback and Kangneung areas. The concentration of quartz was determined by Fourier Transform Infrared Spectrophotometry. The results were as follows; 1) The concentration of respirable dust of drilling and coal face in Taeback and Kangneung areas were as followed. 2) Distribution of respirable dust was well fitted to the long-normal distribution and geometric mean value was log(-1) 0.37+/-log(-1) 0.47 (2.34+/-2.95) mg/m3. 3) The difference of respirable dust concentrations in Taeback and Kangneung areas was not significant statistically (p>0.05). 4) The concentration of quartz of drilling and coal face in Taeback and Kangneung areas were as followed. 5) Distribution of quartz concentrations was well fitted to the log-normal distribution and geometric mean value was log(-1) 0.33+/-log(-1) 0.45 (2.14+/-2.82)%. 6) The difference of quartz concentrations in Taeback and Kangneung areas was not significant (p>0.05), but significant at drilling sites and coal faces (p<0.05).
Coal* ; Dust* ; Fourier Analysis ; Gangwon-do* ; Quartz* ; Spectrophotometry, Infrared

OBJECTIVETo establish a rapid determination method of pinoresinol diglucoside in Eucommiae unloads by near-infrared reflectance spectroscopy (NIRS).

METHODForty-one samples of E. unloads were collected from three different producing areas and their main component, namely pinoresinol diglucoside, was determined by HPLC. Corresponding data of samples were collected from 12 000 to 4 000 cm(-1) by near-infrared reflectance spectroscopy. The spectral pretreatment was optimized by OPUS software and the calibration equations between the content of pinoresinol diglucoside and spectrum data were constructed by partial least squares regression.

RESULTAvailable information could be extracted from spectra in the range from 7 502 to 4 597.6 cm(-1) after corrected by applying second derivative transformation and subtract a linear correction. Cross validation was used to prevent over-fitting. Good correlation existed between pinoresinol diglucoside content and NIR spectra ( R2 = 0.926 4, SEC = 0.029 and SEP = 0.066 2).

CONCLUSIONNIRS calibration equations developed in this study could be applied to the rapid analysis of the pinoresinol diglucoside content.

Mid-infrared (MIR) spectroscopy is applicable to blood glucose sensing without using any reagent, however, due to a result of inadequate accuracy, till now this method has not been used in clinical detection. The principle and key technologies of blood glucose sensing by MIR spectroscopy are presented in this paper. Along with our experimental results, the paper analyzes ways to enhance measurement accuracy and prediction accuracy by the following four methods: selection of optimized spectral region; application of spectra data processing method; elimination of the interference with other components in the blood, and promotion in system hardware. According to these four improving methods, we designed four experiments, i.e., strict determination of the region where glucose concentration changes most sensitively in MIR, application of genetic algorithm for wavelength selection, normalization of spectra for the purpose of enhancing measuring reproduction, and utilization of CO2 laser as light source. The results show that the measurement accuracy of blood glucose concentration is enhanced almost to a clinical detection level.
Blood Glucose ; analysis ; Humans ; Hyperglycemia ; blood ; Spectrophotometry, Infrared ; methods

An apigenin molecularly imprinted polymer was prepared by bulk polymerization using apigenin as template, acrylamide (AA) as a functional monomer, ethylene glycol dimethacrylate (EDMA) as a crosslinking agent, acetonitrile and N, N-dimethylformamide as porogenic solvents, and 2, 2'-azobisisobutyronitrile (AIBN) as an initiator. The interaction between template and functional monomer was proved by ultraviolet visible (UV) spectrophotometry and based on the results, appropriate reaction solvent was selected and the synthesizing process was estimated. The molecularly imprinted polymer structure was analyzed by Fourier Transform Infrared (FT-IR) spectrophotometry. The molecularly imprinted polymer was investigated in equilibrium binding experiment to evaluate its adsorption property, the results showed that the adsorption of apigenin on molecularly imprinted polymer is higher than that on blank polymer in the studied concentration range (0.1-2.5 mmol x L(-1)). Scatchard analysis showed that two classes of binding sites existed in the apigenin imprinted polymers, with their KD and Qmax estimated to be 2.52 x 10(-4), 0.54 x 10(-3) mmol x L(-1) and 2.65, 18.89 micromol x g(-1), respectively. Molecularly imprinted polymer showed higher affinity than blank polymer.
Apigenin ; chemical synthesis ; chemistry ; Molecular Imprinting ; Molecular Structure ; Polymers ; chemical synthesis ; chemistry ; Spectrophotometry, Infrared ; Spectrophotometry, Ultraviolet

To reveal the possible mechanism of silica deposition in higher plants, lignin was isolated from rice straw following a modified method to conduct a simulation experiment in vitro. UV and infrared absorption spectra showed that the substance had the unique characteristics of pure lignin. The presence of silicon in the precipitation was revealed by TEM (transmission electron microscopy) with EDXA (energy dispersive X-ray analysis) device. It was found that in the borax solution where lignin precipitation occurred silica-lignin co-precipitation was produced but not in the DMSO solution where lignin was broken into its composition compounds and did not precipitate. This means that it is macromolecular lignin itself but not its compounds that could induce silica deposition in higher plants.
Lignin ; analysis ; chemistry ; metabolism ; Microscopy, Electron, Transmission ; Oryza ; chemistry ; metabolism ; Silicon Dioxide ; analysis ; chemistry ; metabolism ; Spectrophotometry, Infrared ; Spectrophotometry, Ultraviolet

The vibrational spectral differences of normal and lung cancer cells were studied for the development of effective cancer cell screening by means of attenuated total reflection infrared spectroscopy. The phosphate monoester symmetric stretching nus(PO3(2-)) band intensity at ~970 cm-1 and the phosphodiester symmetric stretching nus(PO2-) band intensity at ~1,085 cm-1 in nucleic acids and phospholipids appeared to be significantly strengthened in lung cancer cells with respect to the other vibrational bands compared to normal cells. This finding suggests that more extensive phosphorylation occur in cancer cells. These results demonstrate that lung cancer cells may be prescreened using infrared spectroscopy tools.
*Carcinoma ; Cell Line, Tumor ; Epithelial Cells/*physiology ; Humans ; *Lung Neoplasms ; Respiratory Mucosa/*cytology ; *Spectrophotometry, Infrared

The gallstones from one hundred consecutive patients having stones in the gallbladder only were analyzed using both gross appearance and infrared spectrophotometry. There were 47 males and 53 females, and the sex ratio was 1:1.13. The most prevalent age was in the fifties in both sexes. Grossly, the number (and also the percentage) of cases of pure cholesterol, mixed cholesterol, calcium bilirubinate, black pigment, and combination stones were 4, 42, 23, 30, and 1, respectively. In the analysis by infrared spectrophotometry, the number of cases of cholesterol, calcium bilirubinate, and calcium carbonate stones were 44, 42, and 14, respectively. The accordance of gross appearance with infrared spectrophotometric classification was statistically significant (p=0.049). A comparison of cholesterol stones with pigment stones showed no difference based on either the sex or the age distribution, but there was a significant difference not only in terms of color, shape, and cut-surface (p=0.000) but also in terms of the number of stones (p=0.045). In conclusion, gallstone classification by gross appearance may be a rapid and relatively accurate method. Further study to standardize gallstone classification by various analytic methods is recommanded.
Age Distribution ; Bilirubin ; Calcium Carbonate ; Cholesterol ; Classification ; Female ; Gallbladder* ; Gallstones* ; Humans ; Male ; Sex Ratio ; Spectrophotometry, Infrared

AIMTo discuss the relationship between the three-point interaction principle in the stereoselective separation of chromatography and applying this principle to survey the infrared spectrometry of racemate.

METHODSIn proving the applicability of the three-point interaction principal in IR spectrometry, a special case was found that phenylglycine did not obtain enantioselective separation on the chiral column but its IR spectrometry still obey this principle and explained such special case by experiment.

RESULTSAfter an equal quantity of solid crystal of d-phenylglycine and l-phenylglycine were mixed and ground for several minutes, they transformed to racemic compound. X-powder diffraction also confirmed this fact.

CONCLUSIONThe three-point principle was relatively reliable when it was used in the enantioselective chromatography separation and the IR spectrometric analysis. The reason of the fact that phenylglycine was not separated by chiral column can be explained by the fact that the acting force between the three polarity groups in the enantiomers is so strong that they can not form the instantaneous diastereoisomer with the chiral column, it was agreeable with the phenomenon that racemic mixture easily became racemic compound only by simply grinding the mixture in IR spectrometric experiment.