Biodegradable plastics from musa paradisiaca linn. With psidium guajava leaf extract for for food packaging/ Horace Vincent J. Cruz, Danica Faye C. Dulva, and Allen M. Galupo.--

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Cruz, Horace Vincent J [author]

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Material type: Text

TextPublication details: Manila: Technological University of the Philippines, 2025.Description: xiii, 92pages: 29cmContent type:

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BTH RB 37 C78 2025

Dissertation note: College of Science.-- Bachelor of applied science in laboratory technology: Technological University of the Philippines, 2025. Summary: In the present work, biodegradable plastics for food packaging were developed using starch and cellulose isolated from banana peel waste, with guava leaf extract to enhance antimicrobial properties. The starch and cellulose undergo chemical treatment such as acid, alkali, and bleaching treatment. The isolated starch and cellulose were first characterized using FTIR to confirm their presence and purity. The presence of peak at 3279cm-1 and 3293cm-1 corresponds to the OH group, while the peak 2931.42cm-1 and 2917.06cm corresponds to the C-H stretching of both cellulose and starch. Significant peaks such as C-O stretching and C-H vibration were also observed. The casting method involves the addition of guava leaf extract (0%, 2%, 4%, and 6%) that was added to the constant concentration of 5g of starch, 0.35g of cellulose, 1.2 mL of glycerol, and 1.2 mL of acetic acid. The resulting bioplastic was evaluated in terms of mechanical, chemical, and barrier properties. SEM imaging with 1000x magnification revealed surface variations dependent on guava leaf extract affecting mechanical and barrier properties. Results also revealed that the addition of guava leaf extract affects the thickness of film, tensile strength, water solubility, and water permeability. The thickness of the film ranged from 0.11 mm to 0.15mm. Tensile strength peaked at 6% GLE (0.069 MPa), although all samples did not meet the standard for bioplastic, which is 1.34 MPa. The biodegradability test showed consistent degradation after 7 days, confirming compostability. Antimicrobial results revealed that GLE was either not sufficiently concentrated or not effectively released from the bioplastic matrix under the test conditions.

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Item type	Current library	Shelving location	Call number	Copy number	Status	Date due	Barcode
Bachelor's Thesis COS	TUP Manila Library	Thesis Section-2nd floor	BTH RB 37 C78 2025 (Browse shelf(Opens below))	c.1	Not for loan		BTH0006360

Bachelor's thesis

College of Science.--
Bachelor of applied science in laboratory technology: Technological University of the Philippines,
2025.

Includes bibliographic references and index.

In the present work, biodegradable plastics for food packaging were developed using starch
and cellulose isolated from banana peel waste, with guava leaf extract to enhance
antimicrobial properties. The starch and cellulose undergo chemical treatment such as acid,
alkali, and bleaching treatment. The isolated starch and cellulose were first characterized
using FTIR to confirm their presence and purity. The presence of peak at 3279cm-1
and

3293cm-1

corresponds to the OH group, while the peak 2931.42cm-1 and 2917.06cm
corresponds to the C-H stretching of both cellulose and starch. Significant peaks such as
C-O stretching and C-H vibration were also observed. The casting method involves the
addition of guava leaf extract (0%, 2%, 4%, and 6%) that was added to the constant
concentration of 5g of starch, 0.35g of cellulose, 1.2 mL of glycerol, and 1.2 mL of acetic
acid. The resulting bioplastic was evaluated in terms of mechanical, chemical, and barrier
properties. SEM imaging with 1000x magnification revealed surface variations dependent
on guava leaf extract affecting mechanical and barrier properties. Results also revealed that
the addition of guava leaf extract affects the thickness of film, tensile strength, water
solubility, and water permeability. The thickness of the film ranged from 0.11 mm to
0.15mm. Tensile strength peaked at 6% GLE (0.069 MPa), although all samples did not
meet the standard for bioplastic, which is 1.34 MPa. The biodegradability test showed
consistent degradation after 7 days, confirming compostability. Antimicrobial results
revealed that GLE was either not sufficiently concentrated or not effectively released from
the bioplastic matrix under the test conditions.

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