Patcharin Phokasem

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4. Materials and Methods 4.1. Honey Aromatic Water Honey aromatic water was obtained from Ban Me Thuot Honey Bee JSC, Dak Lak, Vietnam and kept at 4 °C in an airtight container until further usage. 4.2. Chemical Materials Royal jelly was purchased from Chiangmai Healthy Product Co., Ltd. (Chiang Mai, Thailand). Potato dextrose broth and tryptic soya broth were purchased from Sigma Aldrich (St Louis, MO, USA).