| 000 -LEADER |
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| fixed length control field |
02485nam a2200265Ia 4500 |
| 001 - CONTROL NUMBER |
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| control field |
90108 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
ft7770 |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
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| control field |
20251013160151.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
240311n 000 0 eng d |
| 040 ## - CATALOGING SOURCE |
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| Description conventions |
rda |
| 041 ## - LANGUAGE CODE |
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| Language code of text/sound track or separate title |
engtag |
| 050 ## - LIBRARY OF CONGRESS CALL NUMBER |
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| Classification number |
QD505.5 D46 2023 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER |
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| Classification number |
. |
| 100 ## - MAIN ENTRY--PERSONAL NAME |
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| Personal name |
Criselle Ann Q. Deogracias; Regina Grace D. Gerona; Mary Rose C. Legaspi; Ma Yobhel C. Odtohan and Xylia Veronica T. Sy. |
| 245 #0 - TITLE STATEMENT |
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| Title |
Agar/cassava starch-based pH sensing film with purple yam (Dioscorea spp.) anthocyanin extract as indicator |
| 264 ## - PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE |
|---|
| Place of production, publication, distribution, manufacture |
Manila: |
| Name of producer, publisher, distributor, manufacturer |
PLM, |
| Date of production, publication, distribution, manufacture, or copyright notice |
c2023 |
| 300 ## - PHYSICAL DESCRIPTION |
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| Other physical details |
Undergraduate Thesis: (Bachelor of Science in Chemistry) - Pamantasan ng Lungsod ng Maynila, 2023. |
| 336 ## - CONTENT TYPE |
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| Content type code |
text |
| Content type term |
text |
| Source |
text |
| 337 ## - MEDIA TYPE |
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| Media type code |
unmediated |
| Media type term |
unmediated |
| Source |
unmediated |
| 338 ## - CARRIER TYPE |
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| Carrier type code |
volume |
| Carrier type term |
volume |
| Source |
volume |
| 505 ## - FORMATTED CONTENTS NOTE |
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| Formatted contents note |
ABSTRACT: An agar/cassava starch-based pH sensing film with purple yam (Dioscorea spp.) anthocyanin as indicator was prepared in this study. The final film was composed of 15% and 85% (w/w) agar and cassava starch concentration based on total polymers, respectively. Glycerol was used as plasticizer. Anthocyanins were extracted from purple yam powder using acidified ethanol as extraction solvent. The extracts were analysed using UV-visible spectrophotometry. The absorption spectra revealed that purple yam anthocyanins exhibited color variations (red to yellowish-brown) in response to different pH values ranging from 1.0 to 10.0. Fourier transform infrared spectroscopy results showed that film components were compatible due to the chemical interactions observed. The color change of films upon immersion in different pH buffers ranging from 1.0 to 10.0 were quantified using a chroma meter. Color analysis results, in CIELab parameters, showed that the films exhibited great color variations. Further, the pH sensing films in basic medium (pH 8) were used in detecting milk spoilage. The observed color variations ranged from purple to brownish pink. A representative film immersed in spoiled milk (Nestle) underwent color analysis where a great color difference was noted in comparison with the standard basic film (pH 8). Similarly, purple yam extract was used in detecting milk spoilage, wherein color variations from purple to pink. Based on the results in this study, it can be implied that the developed films could be a potential material in detecting milk spoilage. |
| 526 ## - STUDY PROGRAM INFORMATION NOTE |
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| Classification |
Filipiniana |
| 655 ## - INDEX TERM--GENRE/FORM |
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| Genre/form data or focus term |
academic writing |
| 942 ## - ADDED ENTRY ELEMENTS |
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| Institution code [OBSOLETE] |
lcc |
| Item type |
Thesis/Dissertation |
| Koha issues (borrowed), all copies |
1 |
| Source of classification or shelving scheme |
|