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Biopolymer/Gold Nanoparticles Based ...

Wang, Yi-Cheng.

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Biopolymer/Gold Nanoparticles Based Thermal History Indicator for Monitoring Quality and Safety of Foods and Perishable Products.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Biopolymer/Gold Nanoparticles Based Thermal History Indicator for Monitoring Quality and Safety of Foods and Perishable Products./
作者:	Wang, Yi-Cheng.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	148 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-03, Section: B.
Contained By:	Dissertations Abstracts International80-03B.
標題:	Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10192348
ISBN:	9780438345614

Biopolymer/Gold Nanoparticles Based Thermal History Indicator for Monitoring Quality and Safety of Foods and Perishable Products.
Wang, Yi-Cheng.

Biopolymer/Gold Nanoparticles Based Thermal History Indicator for Monitoring Quality and Safety of Foods and Perishable Products. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 148 p.

Source: Dissertations Abstracts International, Volume: 80-03, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2016.

This item must not be added to any third party search indexes.

The present study reports on the development and evaluation of a new type of visible thermal history indicators (THIs) that incorporate biopolymer/gold nanoparticles (AuNPs). Firstly, gelatin, a biopolymer, was used to study the nucleation and growth mechanisms of AuNPs. The polymeric structure of gelatin could stabilize the HAuCl4/HEPES system and slow the synthesis of AuNPs, enabling time-dependent investigations of AuNPs formation. The results demonstrated that by changing the reduction/nucleation time, heating time, and temperature, size of AuNPs can be varied. Gelatin/AuNPs-, chitosan/AuNPs- and alginate/AuNPs-based THIs were then developed and evaluated. The gelatin/AuNPs-based THIs were found suitable for monitoring low-temperature storage environments, with size and shape variations in AuNPs resulting in color changes that reflected storage time and temperature changes. The observed increases in size may be due to storage temperature, while the changes in shape are likely due to storage time. Moreover, the THIs undergoing higher temperature treatments exhibited more intense color changes. Thus, the observed color changes provide information regarding the thermal history that an object has undergone. The results regarding chitosan/AuNPs nanocomposites showed that these could be used not only as THIs, but also as frozen detectors. Besides the low-temperature storage, the alginate/AuNPs-based THIs can provide a sharp color change from grey to wine-red, if exposed to high temperature (e.g., 40 °C) for a long time. All three systems are tunable by changing their composition and/or synthesis conditions, and are suitable for tracking thermal histories over a wide temperature range from -20 to 90 °C, though their sensitivities are different depending on the temperature ranges. In addition, a tunable AuNPs/gelatin-based THI with a starter switch was also developed. The starter switch effect can be achieved by first synthesizing silver nanoparticles within the biopolymer and then taking advantage of the galvanic replacement between Ag and HAuCl4. The yellowish color of AgNPs would be reset to semi-transparent when gold precursor is added into the AgNPs/gelatin system; the AuNPs are then synthesized under the effect of the prevailing thermal history. These environmental-friendly, easy-to-use, and inexpensive biopolymer/AuNPs-based THIs could readily be developed for end-use applications in the food, biomedical, and other industries.

ISBN: 9780438345614Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Alginate

Biopolymer/Gold Nanoparticles Based Thermal History Indicator for Monitoring Quality and Safety of Foods and Perishable Products.
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245 1 0 $a Biopolymer/Gold Nanoparticles Based Thermal History Indicator for Monitoring Quality and Safety of Foods and Perishable Products.
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300 $a 148 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-03, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Gunasekaran, Sundaram.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2016.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a The present study reports on the development and evaluation of a new type of visible thermal history indicators (THIs) that incorporate biopolymer/gold nanoparticles (AuNPs). Firstly, gelatin, a biopolymer, was used to study the nucleation and growth mechanisms of AuNPs. The polymeric structure of gelatin could stabilize the HAuCl4/HEPES system and slow the synthesis of AuNPs, enabling time-dependent investigations of AuNPs formation. The results demonstrated that by changing the reduction/nucleation time, heating time, and temperature, size of AuNPs can be varied. Gelatin/AuNPs-, chitosan/AuNPs- and alginate/AuNPs-based THIs were then developed and evaluated. The gelatin/AuNPs-based THIs were found suitable for monitoring low-temperature storage environments, with size and shape variations in AuNPs resulting in color changes that reflected storage time and temperature changes. The observed increases in size may be due to storage temperature, while the changes in shape are likely due to storage time. Moreover, the THIs undergoing higher temperature treatments exhibited more intense color changes. Thus, the observed color changes provide information regarding the thermal history that an object has undergone. The results regarding chitosan/AuNPs nanocomposites showed that these could be used not only as THIs, but also as frozen detectors. Besides the low-temperature storage, the alginate/AuNPs-based THIs can provide a sharp color change from grey to wine-red, if exposed to high temperature (e.g., 40 °C) for a long time. All three systems are tunable by changing their composition and/or synthesis conditions, and are suitable for tracking thermal histories over a wide temperature range from -20 to 90 °C, though their sensitivities are different depending on the temperature ranges. In addition, a tunable AuNPs/gelatin-based THI with a starter switch was also developed. The starter switch effect can be achieved by first synthesizing silver nanoparticles within the biopolymer and then taking advantage of the galvanic replacement between Ag and HAuCl4. The yellowish color of AgNPs would be reset to semi-transparent when gold precursor is added into the AgNPs/gelatin system; the AuNPs are then synthesized under the effect of the prevailing thermal history. These environmental-friendly, easy-to-use, and inexpensive biopolymer/AuNPs-based THIs could readily be developed for end-use applications in the food, biomedical, and other industries.
590 $a School code: 0262.
650 4 $a Chemistry. $3 516420
650 4 $a Nanoscience. $3 587832
650 4 $a Nanotechnology. $3 526235
653 $a Alginate
653 $a Chitosan
653 $a Gelatin
653 $a Gold nanoparticles
653 $a Localized surface plasmon resonance
653 $a Optical sensor
690 $a 0485
690 $a 0565
690 $a 0652
710 2 $a The University of Wisconsin - Madison. $b Biological Systems Engineering. $3 2049925
773 0 $t Dissertations Abstracts International $g 80-03B.
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791 $a Ph.D.
792 $a 2016
793 $a English
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