农业工程学报
農業工程學報
농업공정학보
2015年
1期
288-293
,共6页
李星恕%许刚%黄磊%张志伟%岳田利
李星恕%許剛%黃磊%張誌偉%嶽田利
리성서%허강%황뢰%장지위%악전리
贮藏%植物%电阻抗%猕猴桃%Hayden模型%生长调节剂%后熟过程
貯藏%植物%電阻抗%獼猴桃%Hayden模型%生長調節劑%後熟過程
저장%식물%전조항%미후도%Hayden모형%생장조절제%후숙과정
storing%plants%electrical impedance%kiwifruit%Hayden model%plant growth regulator%ripening process
为了探索植物生长调节剂对后熟过程中猕猴桃电阻抗图谱的影响,检测了膨大果和未处理的对照果的电阻抗图谱,观察了2类猕猴桃果肉组织细胞微观结构的变化,利用Hayden等效电路模型分析了后熟过程中猕猴桃果肉组织细胞外液电阻、细胞内液电阻和细胞膜阻抗的电学特性变化。后熟过程中,低频时膨大果阻值较大但变化较小,高频时2类猕猴桃阻值趋于一致;频率为12kHz时相位角最大;2类果的Cole-cole图均为一段圆弧,对照果的圆弧半径变化较大;膨大果细胞膜阻抗差异不显著,对照果从第7天开始细胞膜阻抗急剧减小;对照果细胞外液电阻低于膨大果,从第7天开始2类果均呈现减小趋势。电阻抗图谱法揭示了后熟过程中对照果与膨大果的电阻抗特性变化规律,为猕猴桃膨大果的检测识别提供了研究基础。
為瞭探索植物生長調節劑對後熟過程中獼猴桃電阻抗圖譜的影響,檢測瞭膨大果和未處理的對照果的電阻抗圖譜,觀察瞭2類獼猴桃果肉組織細胞微觀結構的變化,利用Hayden等效電路模型分析瞭後熟過程中獼猴桃果肉組織細胞外液電阻、細胞內液電阻和細胞膜阻抗的電學特性變化。後熟過程中,低頻時膨大果阻值較大但變化較小,高頻時2類獼猴桃阻值趨于一緻;頻率為12kHz時相位角最大;2類果的Cole-cole圖均為一段圓弧,對照果的圓弧半徑變化較大;膨大果細胞膜阻抗差異不顯著,對照果從第7天開始細胞膜阻抗急劇減小;對照果細胞外液電阻低于膨大果,從第7天開始2類果均呈現減小趨勢。電阻抗圖譜法揭示瞭後熟過程中對照果與膨大果的電阻抗特性變化規律,為獼猴桃膨大果的檢測識彆提供瞭研究基礎。
위료탐색식물생장조절제대후숙과정중미후도전조항도보적영향,검측료팽대과화미처리적대조과적전조항도보,관찰료2류미후도과육조직세포미관결구적변화,이용Hayden등효전로모형분석료후숙과정중미후도과육조직세포외액전조、세포내액전조화세포막조항적전학특성변화。후숙과정중,저빈시팽대과조치교대단변화교소,고빈시2류미후도조치추우일치;빈솔위12kHz시상위각최대;2류과적Cole-cole도균위일단원호,대조과적원호반경변화교대;팽대과세포막조항차이불현저,대조과종제7천개시세포막조항급극감소;대조과세포외액전조저우팽대과,종제7천개시2류과균정현감소추세。전조항도보법게시료후숙과정중대조과여팽대과적전조항특성변화규률,위미후도팽대과적검측식별제공료연구기출。
Plant growth regulators were used frequently to improve the yield of kiwifruits in recent years. But the use of plant growth regulators often caused low internal quality and deformity of fruits, and the expanded kiwifruits easily decay after softening. It is necessary to explore the effect of plant growth regulators on kiwifruit tissue during the ripening process. Up to now, the traditional chemical methods and the other modern techniques such as NIR, FTIR and NMR have been adopted to analyze the influence of plant growth regulators on fruit tissues. But these approaches are difficult to achieve fast and cheap measurement. Electrical impedance spectroscopy (EIS) is a fast developing method in analyzing materials' characterization. When currents with different frequencies flow through the biological tissue, cytomembrane, the extracellular and intracellular fluid would show different electrical properties. Therefore, EIS has the potential to be used for detecting the change of kiwifruit cell microstructure during the ripening process. To develop a quick, convenient and economic method for exploring the effect of plant growth regulators on kiwifruit fruit, EIS technique was used to analyze the change of biological tissue at cellular level during the ripening process of the expanded and control kiwifruits by using an equivalent electrical circuit. Hayden model was chosen to analyze kiwifruit ripening process, which is composed of extracellular resistance, intracellular resistance and constant phase element representing the cytomembrane. Complex nonlinear least square (CNLS) method was used for fitting the EIS data and determining the parameters of Hayden model. The results indicated that the impedance magnitude of the expanded and control fruits decreased with increasing frequency, and impedance magnitude decreased with kiwifruit ripening only at low frequencies. It was obvious during the ripening process that the impedance of control fruits decreased more quickly than that of the expanded fruits. The phase angles of two types of kiwifruits increased sharply and then decreased quickly with the increase of frequency, and reached the maximum values at 12 kHz. Cole-cole plots of kiwifruit tissues presented the semicircles with different radiuses, which represent the characteristics of typical biological tissue. Cytomembrane impedances of expanded kiwifruits changed minimally during the ripening process of 15 days, but after 7 days, cytomembrane impedances of the control fruits dropped sharply. Extracellular fluid resistance of two types of kiwifruits initially decreased, then increased and finally decreased with ripening process. Extracellular fluid resistance of expanded fruits was larger than that of control fruits, and extracellular fluid resistance of control fruits dropped more quickly than that of expanded fruits after 7 days. Variation of intracellular fluid resistance of two types of kiwifruits was not obvious. Because plant growth regulator could alleviate the damage of cell membrane, EIS properties of two types of kiwifruits were different. So electrical impedance spectroscopy is useful for the identification of expended kiwifruits from untreated kiwifruits by impedance properties. Consequently use of EIS to analyze the ripening process provides a technological foundation for the detection of expanded fruits.