*2.2. Vegetables*

Potatoes of uniform size and colour, and free of defects, were purchased from a New-Mart in Dalian City (China). All samples were kept at low temperature (approximately 4 ◦C) before processing [32].

### *2.3. Antimicrobial Activity of Essential Oils*

### 2.3.1. Essential Oils

Eighteen EOs were used for this study. Cinnamon oil (*Cinnamomum cassia*), oregano oil (*Origanum vulgare*), clove oil (*Eugenia caryophyllus*), and tea tree oil (*Melaleuca alternifolia*), pomelo oil (*Citrus maxima* (Burm.) Merr.), jasmine oil (*Jasminum sambac* (L.) Ait.), eucalyptus oil (*Eucalyptus globulus*), sweet orange oil (*Citrus sinensis* (Linn.) Osbeck), sea buckthorn pulp oil (*Hippophae rhamnoides* L.), sweet osmanthus oil (*Osmanthus fragrans* (Thunb.) Lour.), lavender oil (*Lavandula angustifolia*), petitgrain oil (*Citurs sinensis* L. Osbeck), grapefruit oil (*Citrus paradisi* Macf.), rose oil (*Rosa rugosa* Thunb.), and citrus oil (*Citrus reticulata* Blanco) were obtained from Ji'an (Ji'an Zhongxiang Natural Plant, Ji'an, China). Some EOs obtained from Tongren (Miaoyao Biotech Co., Ltd., GuiZhou, China) were blumea oil (*Blumea balsamifera*), rosemary oil (*Rosmarinus officinalis*), and valeriana oil (*Valeriana officinalis*). Prior to their use in experiments, each EO was filtered using a 0.22 mm filter membrane (Millex-GP Filter Unit; Merck Millipore, Darmstadt, Germany) and stored at room temperature.
