• Journal of Pharmaceutical Investigation
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• v.6 no.2
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• pp.83-87
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• 1976

Microanalysis of rodenticide by visible absorption method was attempted. The following procedure was found to be very simple and to give accurate results. RH-28787 was added to dimethylformamide (DMF), and extracted after stirring for about 20 minutes in extractor $(30^{\circ}C)$. After extraction, the absorbance of DMF solution, was measured at 346 nm by using spectrophotometer. The result agrees closely with the experimentally determined value by means of the gas chromatograph.

• YAKHAK HOEJI
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• v.30 no.2
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• pp.100-103
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• 1986

The second derivative absorption spectra of acetaminophen in commercial tablet forms were measured without prior separation from other pharmaceutical adjuvants. The second derivative spectra of acetaminophen were found to have no influence on the characteristic absorbance band of it. A plot of 25 sets of the ordinate (Z) values with various acetaminophen concentrations mixed in other additives gave a straight line (correlation coefficient, 0.9999) and the slope was 2.901${\times}10^{-2}Z$ value/($\mu\textrm{g}$/ml). The procedures were sufficiently sensitive, precise and economical for the assay of tablets of acetaminophen.

• YAKHAK HOEJI
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• v.18 no.3
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• pp.190-196
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• 1974

A new colorimetric method established for the determination of ampicillin was based on the reductions of phosphomolybdic acid by ampicillin to be resutled in a molybdenum blue which showed a mezimal absorbance at 770nm. The pH effects on a molybodenum blue solution was dependent significantly on temeprature, but the wave-length shift was not effected by the molybdenum blue.

• Advances in environmental research
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• v.1 no.3
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• pp.211-221
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• 2012

Bromadiolone (BRD), a second generation anticoagulant often applied to the living environment to control rodents, is usually considered to have low environmental toxicity due to its poor solubility in water. In this study of the effect of humic acid (HA) on BRD using electronic absorption spectroscopy, it has been observed that BRD is appreciably solubilized even in low concentrations of aqueous HA solutions. The BRD solubilization efficiency of aqueous HA was found to be $2.39{\pm}0.14$ ($4.53{\pm}0.26{\mu}M\;ppm^{-1}$). It was also seen that BRD is reasonably solubilized in aqueous extract of farm soil.

• Journal of the Korean Ceramic Society
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• v.31 no.4
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• pp.367-374
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• 1994

Inorganic-organic composite was made through sol-gel process. Possible range for hosting organic dye was investigated with various composition. The transmittance of the composite was the most important condition for a host was increased to 90% with decreasing HCl as a catalyst. Clear absorbance peak was obtained by decreasing concentration of organic dye, fluorescent intensity was increased and transmittance was decreased with rising gelling temperature.

• Textile Coloration and Finishing
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• v.6 no.1
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• pp.49-53
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• 1994

The transparent coloration of glasses has been successfully achieved by coated glass surface with squarylium dye by the sol-gel colored coating method. Treatment of sol-gel colored coating layer with HCI(g) greatly decreases the absorbance at λ$_{max}$, that increases exposure to $NH_{3}$(g) and the reversible color-colorless responce was extremely rapid.d.

• Textile Coloration and Finishing
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• v.12 no.5
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• pp.288-294
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• 2000

The dyeing of Tencel fabric with Coptis chinensis Franch was studied. The colorant was extracted with distilled water under various concentrations of dyestuff, times, mordants. UV-VIS spectra were obtained to find the maximum wavelength and absorbance of colorant. Tencel fabric was dyed with different mordants in pre and post-mordanting methods. Maximum wavelength of spectrum was 343 nm, and K/S value of pre-mordant was higher than post-mordant. Aluminium and stannic mordants changed color from yellow to blue-greenish and red-bluish. Colorfastnesses of light, and washing were low grade, but that of perspiration was increased.

• Bulletin of the Korean Chemical Society
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• v.10 no.2
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• pp.148-151
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• 1989

The hydrophobic interaction between tetraphenylborate (TPB$^-$) or tetrakis (4-fluorophenyl)borate (TFB$^-$) and crystal violet has been investigated in aqueous solutions by absorption spectrophotometry. Both of the anions promote the aggregation of the ion pairs formed between crystal violet and TPB$^-$ or TFB$^-$. When crystal violet and borate anion are nearly equimolar, insoluble floating aggregates can be observed. Based on the relative absorbance of H and J bands and on the effect of TX-100, TFB$^-$ is found to be more hydrophobic than TPB$^-$.

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.290.2-290.2
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• 2003

Skin Moisture is an important factor in skin health. Measurement of moisture content can provide diagnostic information on the condition of skin. In this study, a photo diode array type near infrared spectroscopy was used to determine skin moisture. Diffuse reflectance spectra were collected and transformed to absorbance using 1-nm stepsize over the wavelength range of 1100 nm to 2200 nm. (omitted)

• Preventive Nutrition and Food Science
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• v.7 no.3
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• pp.231-237
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• 2002

This study was conducted to determine biological activities, such as lipid peroxidation inhibition, cytotoxicity, sun blocker, inhibition of tyrosinase, and antioxidative effect, of ethanol extracts, and of solvent fractionated ethanol extracts obtained from grape seeds and skins. The strongest lipid oxidative inhibition of 66.9% and 67.6% was observed respectively, in the presence of 20 $\mu\textrm{g}$/$m\ell$ of both ethanol extract and water fraction of grape seeds. Overall, the ethanol extracts and their fractions of grape seeds exhibited stronger lipid oxidative inhibition than that of skin extracts. On the other hand, the ethanol extracts of grape skins showed stronger cytotoxicity than that of seeds on MCF-7, Hep3B, and A549 cancer cell lines. However, the water fraction of seed ethanol extracts showed the strongest cytotoxic effect of 76.52% and 67.01% on MCF-7 and Hep3B, respectively among their fractions. Ethanol seed extracts obtained at 3$0^{\circ}C$ had the strongest absorbance both at UVA region (350 nm) and UVB region (308 nm) and the chloroform fraction showed the strongest absorbance at W region and butanol fraction at UVA region among their tractions, respectively. In the meantime, the ethanol extracts obtained at 3$0^{\circ}C$ and butanol fraction showed the strongest tyrosinase inhibitory effect of 39.4% and 37.6%, respectively. This study shows that ethanol extracts and their fractions of grape seeds and skins could be potential good materials for functional food and cosmetic products.