方一超
(華南農業大學食品學院,廣東廣州510642)
直流正電暈降解乙烯的實驗與機理初探
方一超
(華南農業大學食品學院,廣東廣州510642)
為了去除果蔬貯藏環境中的乙烯。采用多針對圓筒內壁式電暈放電反應器對降解冷庫中的乙烯進行研究??疾旆烹姽β蔖和空氣流量Q對乙烯降解的影響。結果表明,電暈放電低溫等離子體對乙烯有降解作用。降解效果隨著放電功率的增大而增強,但空氣流量對降解乙烯速率的影響效果不一。電暈放電低溫等離子體降解乙烯符合準一級反應動力學方程(Weibull方程)。并探討了電暈降解乙烯的機理。
果蔬貯藏,直流電暈,乙烯降解
Abstract:In order to remove the ethylene in the cold storage,a multi-needle-to-cylinder type corona discharge reactor was established to study the degradation of ethylene.Corona discharge non-thermal plasma had effect on degrading ethylene.There were two major factors affecting corona discharge non-thermal plasma on the degradation of the ethylene:discharge power and air flow.The degradation increased with the discharge power,but there was mixed results of the degradation of ethylene affecting by gas flow rate.Results showed that corona discharge plasma degradation of ethylene was in line with kinetic equation(Weibull equation).At same time the mechanism of degradation of ethylene by using DC positive corona was studied.
Key words:fruit and vegetable storage;DC positive corona;degradation of ethylene
低溫貯藏是當今世界上應用最為廣泛的果蔬貯藏方法[1]。低溫保鮮庫中環境因子的變化極大地影響著采后園藝產品的生理狀況。在密閉的保鮮庫中,采后園藝產品自身釋放和其他來源的乙烯等有機氣體通過對代謝的直接或者間接作用,使園藝產品加速衰老。乙烯等有機氣體能增加呼吸強度,增加代謝酶的活性,加速膜透性升高和細胞的區隔化損失,從而縮短園藝作物采后壽命。但是,目前脫除保鮮貯運環境中乙烯等有機氣體的方法都有一些不足[2]。因此,將低溫等離子體技術運用到貯藏保鮮庫中引起了科研人員們的關注[3-4]。電暈放電是產生低溫等離子體的方法之一[5-6]。電暈放電產生的等離子活性物質對乙烯有降解作用,并且對微生物有一定的致死作用,在園藝產品保鮮貯藏庫內設立特定電暈放電低溫等離子體系統,使庫內空氣在該系統中進行乙烯的降解和霉菌的滅活,從而達到修復保鮮庫內空氣的目的[7-8]。……