AIP Conference Proceedings [AIP Publishing THE 5TH INTERNATIONAL CONFERENCE ON INDUSTRIAL, MECHANICAL, ELECTRICAL, AND CHEMICAL ENGINEERING 2019 (ICIMECE 2019) - Surakarta, Indonesia (17–18 September 2019)] THE 5TH INTERNATIONAL CONFERENCE ON INDUSTRIAL, MECHANICAL, ELECTRICAL, AND CHEMICAL ENGINEERING 2019 (ICIMECE 2019) - The preliminary study on functional food standardization to ensure the quality of green product: Innovation product case study