Studies On The Chemical Antiseptic Applying Techniques During Storage For Red Globe Grape

Red globe grape is a typical fresh variety and is disagree to make massive process, so developing storage project of red globe grape has been urgent affairs. But, storage technology of red globe grape has not been settled entirely. Red globe grape has storage commonness of serotinous grape, and it also has special problem. Extrusive question is red globe grape is easy to incur SO2 injure under storage. The symptom is whiten speckle, which has a serious effect on their edible value and commercial value. Using SO2 is absolutely necessarily under the grapes storage. SO2 is way of grape preservative must has suited dosage. If dosage is too small, grapes are easy to get sear, go moldy and get brown. If dosage is too large, peduncle of grapes are fresh and rot rate is low, but grapes are terribly easy to blanch, and much leftover are harm to clay. This test has studied that some antiseptic apply techniques during storage for red globe grape, and put forward means of reducing SO2 injure. At certain temperature, this test has studied changes of reducing sugar, titratable acid, Vc, MDA and sulfite residue, and has studied influence of antiseptic to storage quality, and has studied antiseptic and storage measure which can partially substitute SO2 and storage measure. Results showed:1. The leading pathogeny microbes resulted in decay was Botrytis cinerea, Penicillum spp and Alternairia spp.2. Bromo-Geramium has very strong restraining effect, and MIC is 0.025%. Bromo-Geramium. To Botrytis cinerea and Penicillum spp, MIC of Bromo-Geramium is 0.4%. To Botrytis cinerea, Penicillum spp and Alternairia spp, MIC of Ethylp-hydroxybenzoate is 0.04%.To the three bacteria, Ethylp-hydroxybenzoate has contiguous inhibition zone. Then, Ethylp-hydroxybenzoate has contiguous restraining effect to the three bacteria. To Alternairia spp, MIC of ICC is 100mg/kg. ICC put up strong restraining effect. To Penicillum spp, MIC of ICC is 200mg/kg. To Botrytis cinerea, MIC of ICC is 400mg/kg. ICC put up stronger effect to Penicillum spp than to Alternairia spp. Nanoscale silver has strong restraining effect to the three bacteria, and has very low MIC to the three bacteria. To Alternairia spp, MIC of Nanoscale silver is 80mg/kg. To Penicillum spp and Botrytis cinerea, MIC of Nanoscale silver is 160mk/kg.3. Integrated with other antiseptics, SO₂ of appropriate concentration (4bags CT₂/5Kg grape fruits) would restrain depletion of reducing sugar, titratable acid and Vc of grape, andwould restrain increase of MDA content, and would suspend ripeness and caducity of grapes. It's effects were better than that of SO2 or close to that of SO2.4. The residue of SO2 in different parts of grape varied from high to low as such sequent: capstem, axis, peel, brush and flesh. SO2 residue in edible parts of grape treated with suitable SO2 was lower than FDA standard (lOmg/kg) after stored for 150d. During simulant shelf life, SO2 residue in capstem and brush increased while residue in peel, axis and flesh decreased.5. Integrated with 0.02% Ethylp-hydroxybenzoate and 0.2% Bromo-Geramium microencapsulated, with P-cyclodextrin as wall material or 80mg/kg Nanoscale silver or lOOmg/kg ICC, SO2 of appropriate concentration (4bags CT2/5Kg grape fruits) would restrain SO2 injure obviously. But antisepsis and avoiding browning effect of that treatment were different. Compared with suitable SO2: Integrated with 0.02% Ethylp-hydroxybenzoate and 0.2% Bromo-Geramium microencapsulated, with p-cyclodextrin as wall material, SO2 of appropriate concentration (4bags CT2/5Kg grape fruits) was batter than it's antisepsis effect and was close to it's avoiding browning effect. Integrated with 80mg/kg Nanoscale silver, SO2 of appropriate concentration (4bags CT2/5Kg grape fruits) was close to it's antisepsis and avoiding browning effect. Integrated with lOOmg/kg ICC, SO2 of appropriate concentration (4bags Ciy5Kg grape fruits) was batter than it's avoiding browning effect and was close to it's antisepsis effect.6. Microencapsulation of the agents with P-cyclodextrin as wall material, could strengthen the capacity of antisepsis and fresh-keeping.