采后纳米材料包装结合气调处理对紫背天葵贮藏品质的影响及数学模型建立

以紫背天葵为试材，采用纳米材料自发气调、HDPE袋(15 μm厚)人工气调（3% O2）和纳米材料结合人工气调（3% O2）包装处理，并置于0 ℃条件下贮藏20 d，每5 d测定一次生理指标，包括腐烂率、呼吸强度及叶绿素、花青素、还原糖、总糖、氨基酸、蛋白质含量。结果表明，纳米结合人工气调包装处理组可有效保持采后紫背天葵的叶绿素和花青素含量，保持良好的外观色泽，通过延缓花青素、还原糖、总糖、氨基酸和蛋白质含量的下降，有效保持品质，延缓衰老。建立的一元回归方程为：腐烂率/%=24.605－0.020X7＋1.122X4－0.162X5（式中：X4为还原糖含量；X5为花青素含量；X7为叶绿素含量），拟合度较好(R2＞0.9)，可应用于生产实践。

Establishment of a Mathematical Model for Treatment of Gynura bicolor DC. by Nano-Packaging in Combination with Controlled Atmosphere

The effects of nano-packaging (NP) in combination with controlled atmosphere (CA) on the preservation and
nutritional quality of fresh Gynura bicolor DC (G. bicolor). were investigated during storage at 0 ℃. The nutrition and
quality indices including decay index, respiration rate, as well as the contents of anthocyanin, chlorophyll, amino acid,
protein, total carbohydrate and reducing sugar were tested every 5 days. The combined treatment (CA+NP) improved the
nutritional quality of G. bicolor compared with polyethylene packaging in CA or NP in a modified atmosphere alone. After
20-day storage, CA + NP treatment significantly inhibited respiration intensity and maintained higher contents of total
soluble solids, anthocyanin, chlorophyll, amino acids, protein, total sugar, and reducing sugar. The simplified regression
model: Decay index/%=24.605 - 0.020X7 + 1.122X4 - 0.162X5 (where, X4: reducing sugar content, X5: anthocyanin content,
X7: chlorophyll content) revealed satisfactory goodness of fit (R2 ＞ 0.9). Hence, this model can be applied in practice.