Effect of nanocomposite film on oil quality of Torreya grandis'Merrillii'nuts during storage
[Objective]This study aims to study the changes of oil quality in nano-film packaged Torreya grandis'Merrillii'nuts during storage,and provide theoretical basis for searching new packaging material.[Method]The nanocomposite film solution prepared from pseudoseed residue after essential oil extraction and its essential oil were used as packaging raw materials.The oxidation experiment of the nuts during storage(0-6 weeks)was conducted by Schaal oven method.Two packaging types were set up(direct coating:control,short for ck;nanocomposite film solution coating,short for Coating;film bagged:plastic bag,short for PE;nanocomposite film bag,short for Film).[Result](1)During 4 to 6 week of storage time,the iodine value of the nuts with Coating was significantly higher than that of ck(P＜0.05),but it of the nuts with Film was significantly lower than that of PE(P＜0.05).(2)During 5 to 6 week of storage time,the lipid oxidase activity,peroxidation value,carbonyl value and thiolbarbituric acid content of the nuts with Coating were significantly higher than those of ck(P＜0.05),and the above indicators of the nuts with Film were significantly lower than those of PE.(3)PCA analysis showed that there was no obvious separation between the nuts with Coating and Film,however,the two treatments clearly separated from PE and ck.[Conclusion]The newly prepared nanocomposite film solution,whether directly coating or film bagged can significantly delay the rancidity of the nuts,with better oil quality during storage.[Ch,6 fig.36 ref.]
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