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Applications of infrared spectroscop...

Ng, Choo Lum.

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Applications of infrared spectroscopy to agricultural and food products.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Applications of infrared spectroscopy to agricultural and food products./
作者:	Ng, Choo Lum.
面頁冊數:	167 p.
附註:	Adviser: Randy L. Wehling.
Contained By:	Dissertation Abstracts International68-10B.
標題:	Agriculture, Food Science and Technology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284030
ISBN:	9780549276371

Applications of infrared spectroscopy to agricultural and food products.
Ng, Choo Lum.

Applications of infrared spectroscopy to agricultural and food products. - 167 p.

Adviser: Randy L. Wehling.

Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2007.

Infrared (IR) spectroscopy has been widely used for component analysis because it is simple, fast, accurate and environmentally friendly. These studies were conducted to investigate the possibility of using IR spectroscopy as an alternative to the conventional methods for determining degree of degradation of frying oils, and also for determining blend level of mixtures of biodiesel and petrodiesel. In addition, the potential of using a single universal calibration to measure degree of degradation of frying oils or blend level of blended biodiesels, respectively, was evaluated in the studies. The first study shows that increased absorption due to a longer path length (4 mm) slightly improved the results for frying oils in the shorter wavelength region (700--100 nm), but the results were not as good as the results obtained by models using a 2 mm path length and longer wavelength region from a previous study.

ISBN: 9780549276371Subjects--Topical Terms:

1017813
Agriculture, Food Science and Technology.

Applications of infrared spectroscopy to agricultural and food products.
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100 1 $a Ng, Choo Lum. $3 1278298
245 1 0 $a Applications of infrared spectroscopy to agricultural and food products.
300 $a 167 p.
500 $a Adviser: Randy L. Wehling.
500 $a Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6405.
502 $a Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2007.
520 $a Infrared (IR) spectroscopy has been widely used for component analysis because it is simple, fast, accurate and environmentally friendly. These studies were conducted to investigate the possibility of using IR spectroscopy as an alternative to the conventional methods for determining degree of degradation of frying oils, and also for determining blend level of mixtures of biodiesel and petrodiesel. In addition, the potential of using a single universal calibration to measure degree of degradation of frying oils or blend level of blended biodiesels, respectively, was evaluated in the studies. The first study shows that increased absorption due to a longer path length (4 mm) slightly improved the results for frying oils in the shorter wavelength region (700--100 nm), but the results were not as good as the results obtained by models using a 2 mm path length and longer wavelength region from a previous study.
520 $a In the second study, near-infrared (NIR) methods were successfully developed for measuring total polar material (TPM) and free fatty acid (FFA) contents in frying oils used to fry various foods. Additionally, a single universal calibration model could be used to determine quality of frying oils used to fry various foods. With the partial least-squares (PLS) models, the best correlations (r) between the NIR predicted data and reference method data for TPMs and FFAs in frying oils were 0.995 and 0.981, respectively.
520 $a The third study investigated the possibility of using mid-infrared (MIR) spectroscopy for determining degree of degradation of frying oils used to fry various foods. The results show that MIR spectroscopy, coupled with a single reflection attenuated total reflection (ATR) cell, was not as good as NIR transmission spectroscopy for predicting TPM and FFA contents in frying oils used to fry various foods. With the PLS models, the r values between MIR predicated data and reference method data for TPMs and FFAs in frying oils were 0.975 and 0.892, respectively.
520 $a The fourth study shows that NIR transmission spectroscopy was successful for estimating the blend levels of blended biodiesels. Also, blend levels of fuels from different sources could be determined by a single universal calibration model. With the PLS models using longer wavelengths, the r and root-mean-square of the differences (rmsd) values were 1 and 0.018%, respectively.
590 $a School code: 0138.
650 4 $a Agriculture, Food Science and Technology. $3 1017813
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710 2 $a The University of Nebraska - Lincoln. $b Food Science & Technology. $3 1262945
773 0 $t Dissertation Abstracts International $g 68-10B.
790 $a 0138
790 1 0 $a Carr, James D. $e committee member
790 1 0 $a Cuppett, Susan L. $e committee member
790 1 0 $a Hanna, Milford A. $e committee member
790 1 0 $a Wehling, Randy L., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284030