Study on effects of MENA on the nutritional quality of potato tubers in storage and its residue dynamic

Aiming to evaluate the effects of MENA on the quality nutrition function of potato tubers and its residual dynamics during storage, vegetable processing potato tubers from Weifang city in Shandong province were taken as the test material. The sprout inhibitor α-naphthyl acetate (MENA)was applied to potato tubers by a direct spray application at 40 and80 mg/kg for two treatment groups while the spraying water was for the control group. These groups were storaged at 4℃ for 150 days. Decay rate, sprout rate, reducing sugar, starch, dry matter, protein, vitamin C and chlorogenic acid content of potato tubers were detected every 30 days. The results showed that MENA could reduce potato tubers decay rate and sprout rate during storage, and could maintain the appearance of potato tubers compared with the control group. MENA could delay the reduction of V_C content (p<0.05)and raise protein content (p<0.05)during potato tubers storage, it also could significantly increase the content of reducing sugar (p<0.05)and raise the level of chlorogenic acid (p<0.05). Residue concentrations of MENA on potato tubers were not detected during storage, suggesting that MENA had a lower risk of residue as a sprout inhibitor.