期刊
JOURNAL OF CHEMICAL EDUCATION
卷 94, 期 9, 页码 1291-1295出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jchemed.7b00045
关键词
High School/Introductory Chemistry; Analytical Chemistry; Laboratory Instruction; Hands-On Learning/Manipulatives; Instrumental Methods; Natural Products; Oxidation/Reduction; Quantitative Analysis; Spectroscopy
资金
- POPH-QREN-Tipologia 4.1-Formacao Avancada - Fundo Social Europeu [SFRH/BPD/78845/2011]
- Ministerio da Ciencia, Tecnologia e Ensino Superior
- bilateral project Luso-Serbia
- Portuguese Science and Technology program
- [UID/QUI/50006/2013]
- Fundação para a Ciência e a Tecnologia [UID/QUI/50006/2013] Funding Source: FCT
This paper reports a laboratorial internship included in the Portuguese Science and Technology promotion program Internships for Young People in Laboratories (Ciencia Viva no Laboratorio), which provided high school students an opportunity to approach the reality of scientific and technological research in a higher education institution. During this internship, students acquired knowledge related to the assessment of the total antioxidant capacity (TAC) of fruits and their byproducts while learning techniques, such as molecular spectrophotometry, as an analytical methodology to measure TAC using the ferric reducing antioxidant power (FRAP) and the total phenolic content (TPC) assays. First, the students were introduced to solid liquid extraction as a conventional technique to extract antioxidants from the selected matrices. In order to optimize the extraction yield, different solvents, temperatures, and extraction times were used. Then, the students developed skills on TPC and FRAP assays by performing calibration curves using standard antioxidants, namely, gallic acid and ascorbic acid, prior to the measurement orange) and respective byproducts. Final analysis included TAC values for comparison between fruits and their byproducts and also the influence of the extraction conditions on the TAC levels. At the end, the students presented their findings in a scientific poster and in a postlaboratory quiz. This laboratorial internship has been carried out since 2012 and was designed to be performed during a week, 7 h per day, in groups of two young students.
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