1. Introduction
Radish (Raphanus sativus L.), belonging to the Brassicaceae family, is an important worldwide root vegetable crop, especially in East Asia, due to its wide adaptation, high yield and abundant nutritional content (Lu et al., 2008). However, fresh radish has a limited shelf-life. Freezing is a well-known preservation technique to maximize the shelf life and preserve the quality of food products (Awad et al., 2012; Kiani and Sun, 2011).