Proceedings of the 7th Mathematics, Science, and Computer Science Education International Seminar, MSCEIS 2019, 12 October 2019, Bandung, West Java, Indonesia

Research Article

Determination of Antioxidant Activity and Physico-Chemicals Characteristics of Fortified Yogurt Powder by Super Red Dragon (Hylocereus Polyrhizus) Fruit Peel Powder

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  • @INPROCEEDINGS{10.4108/eai.12-10-2019.2296463,
        author={Florentina  Supriyanti and Zackiyah  Zackiyah and Fiona  Finandia},
        title={Determination of Antioxidant Activity and Physico-Chemicals Characteristics of Fortified Yogurt Powder by Super Red Dragon (Hylocereus Polyrhizus) Fruit Peel Powder},
        proceedings={Proceedings of the 7th Mathematics, Science, and Computer Science Education International Seminar, MSCEIS 2019, 12 October 2019, Bandung, West Java, Indonesia},
        publisher={EAI},
        proceedings_a={MSCEIS},
        year={2020},
        month={7},
        keywords={antioxidant activity super red dragon fruit peel yogurt powder},
        doi={10.4108/eai.12-10-2019.2296463}
    }
    
  • Florentina Supriyanti
    Zackiyah Zackiyah
    Fiona Finandia
    Year: 2020
    Determination of Antioxidant Activity and Physico-Chemicals Characteristics of Fortified Yogurt Powder by Super Red Dragon (Hylocereus Polyrhizus) Fruit Peel Powder
    MSCEIS
    EAI
    DOI: 10.4108/eai.12-10-2019.2296463
Florentina Supriyanti1,*, Zackiyah Zackiyah1, Fiona Finandia1
  • 1: Chemistry Study Program Department of Chemistry Education Faculty of Mathematics and Natural Sciences Education Indonesian education university Bandung 40514, Indonesia
*Contact email: florentinasupriyanti@yahoo.co.id

Abstract

This research aims to investigate the antioxidant activity and physicochemical characteristics of yogurt powder fortified by the peel of super red dragon (Hylocereus costaricensis) fruit. Methods include the making of super red dragon fruit peel powder, making yogurt, fortification of yogurt using super red dragon fruit peel powder and freeze-drying. The analysis consists of antioxidant activity with the DPPH method and Physico-chemicals characteristics include water content by gravimetric method, ash content by ashing method and pH by potentiometric method. Produced yogurt without fortification (F0) and three fortified yogurt variants F1, F2 and F3 with 10%; 20%; 30% successive fortification. The super red dragon fruit peels had antioxidant activity 93.08% ± 2.51; powdered yogurt before fortification 15.86% ± 3.39 while F1, F2 and F3 fortified powdered yogurt were 63.69% ± 1.70 ; 76.33% ± 2.79 and 92.67% ± 1.61 respectively. The water content of powdered yogurt before fortification was greater than fortified yogurt. The ash content of yogurt before fortification and fortified powdered yogurt are greater than the value of standard ash content. The pH value of yogurt powder before fortification and fortified yogurt is in the pH range of yogurt.