Please use this identifier to cite or link to this item: https://cuir.car.chula.ac.th/handle/123456789/65492
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dc.contributor.advisorNapa Siwarungson-
dc.contributor.authorThanakorn Damsud-
dc.contributor.otherChulalongkorn University. Faculty of Science-
dc.date.accessioned2020-04-24T04:27:34Z-
dc.date.available2020-04-24T04:27:34Z-
dc.date.issued2008-
dc.identifier.urihttp://cuir.car.chula.ac.th/handle/123456789/65492-
dc.descriptionThesis (M.Sc.)--Chulalongkorn University, 2008en_US
dc.description.abstractGuava (Psidium guajava L.) is a tropical fruit, rich in nutrients such as vitamin C, phenolic compounds, pectin and insoluble fiber. We focus on Pansithong, Thai original and Kimju grown locally commercial in Thailand by extracting them with water, 40%ethanol and Simulated Gastrointestinal Digestion (SGD) to analyze total polyphenolic compounds, DPPH scavenging activity, superoxide anion scavenging activity, hydroxyl radical scavenging activity anti-melanogenesis against tyrosinase, total phenolic acid and total vitamin C was found types guava and extracted conditions were the factor that have significant difference (P<0.05). The results showed that Pansithong contained the highest of polyphenol compounds and DPPH scavenging activity (IC₅₀ = 2.76 mg/mL). Moreover, the superoxide scavenging abilities generated in a PMS/NADPH system Thai original (IC₅₀ = 41.47 mg/mL) showed the highest of superoxide anion scavenging activity using 40% ethanol. The hydroxyl radicals were generated by the Fenton system was found Pansithong that used the water for extraction was the highest ability, whereas Thai original that used 40% ethanol for extraction was the highest. Kimju guava was extracted by using SGD demonstrated the highest hydroxyl properties. The anti-melanogenesis against tyrosinase found that Kimju showed the highest extracted (IC₅₀ = 290.71 mg/mL) by water. To analyze contained phenolic acid and Vitamin C determine by HPLC. The highest amounts of ferulic acid that was found in Kimju (14.00 mg/100g) by using 40% ethanol. While, the highest amounts of ascorbic acid were found in Kimju (159.97 mg/100g) using water extracts. Therefore, the effect of guava extracts may have a strong potential for use protective effect in human health.en_US
dc.language.isoenen_US
dc.publisherChulalongkorn Universityen_US
dc.rightsChulalongkorn Universityen_US
dc.subjectAntioxidantsen_US
dc.subjectFree radicals (Chemistry)en_US
dc.subjectExtraction (Chemistry)en_US
dc.subjectPsidium guajava L.en_US
dc.subjectแอนติออกซิแดนท์en_US
dc.subjectอนุมูลอิสระen_US
dc.subjectการสกัด (เคมี)en_US
dc.subjectฝรั่ง (พืช) -- วิเคราะห์และเคมี-
dc.titleAntioxidant and anti-melanogenesis properties of guava (Psidium guajava L.) extracts in vitroen_US
dc.title.alternativeสมบัติการต้านอนุมูลอิสระและการต้านการสร้างเม็ดสีผิวของสารสกัดจากฝรั่งแบบ in vitroen_US
dc.typeThesisen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.levelMaster's Degreeen_US
dc.degree.disciplineBiochemistryen_US
dc.degree.grantorChulalongkorn Universityen_US
dc.email.advisorNapa.S@Chula.ac.th-
Appears in Collections:Sci - Theses

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