Antisepsis and Fresh-keeping Effects of Natamycin Coating Compounds Treatment on Red Global Grape

The aim was to research fresh-keeping effects of natamycin on cold-pre- served grape. Red globe grapes were processed with compound coating liquid of chitosan with mass fraction at 1% and natamycin with mass fractions at 0.20% （T1）, 0.40% （T2） and 0.60% （T3）, respectively. Grapes processed with water （CK3） and 1% chitosan （CK2） were taken as control groups. Rotten rate, seed shattering rate, mass loss rate, respiratory intensity and related physiological quality in test and control groups were compared. The results indicated that respiratory intensity, mass loss rate, rotten rate and seed shattering rate in CK1 were all higher than those in CK2. In addition, T1, T2 and T3 were lower in the indices than CK1 and CK2, but still kept at a high level in fruit hardness. Furthermore, mass fractions of Vc and titratable acid declined more slowly in T1, T2 and T3, compared with CK1 and CK2. Natamycin better preserved grapes and prolonged storage period. In general, natamycin with mass fraction at 0.4% proved best in fresh-keeping.

Effects of Nine Kinds of Household Vase Solutions on Fresh-keeping Effect of Lilium Cut Flowers

[Objective]The paper was to study the effects of nine kinds of household vase solutions on fresh-keeping effect of Lilium cut flowers.[Method]Using Lilium"Sorbonne"as the material,nine kinds of household vase solutions were prepared by edible white granulated sugar,white vinegar,akafen powder and vitamin C tablets,respectively.The morphological and physiological indexes of Lilium cut flowers,including vase life,ornamental grade,flower diameter,fresh weight of flower branches,water balance value,soluble protein content and MDA content of petals,were observed,and the effects of nine kinds of household vase solutions on fresh-keeping effect of Lilium cut flowers were studied.[Result]The household vase solution F8(20 g/L white granated sugar+1 packet/L acafen powder+2 tablets/L vitamin C tablets)had the best fresh-keeping effect on Lilium cut flowers,which was beneficial to prolong the vase life and improve the ornamental value of Lilium cut flowers.[Conclusion]The household vase solution of Lilium cut flowers is optimized,which is not only environmentally friendly but also convenient for ordinary families.

Fresh-keeping Effects of Different Concentrations of 6-BA and B9 on Carnation Cut Flower

Using sucrose, citric acid and vitamin C as the basic liquid, different concentrations of 6-BA and B9 preservatives were added, and the carnation variety ＇ Master＇ was treated. The results showed that the formula of 3% sucrose ＋ 50 mg/L citric acid ＋ 600 mg/L vitamin C ＋ 20 mg/L 6-BA could effectively maintain the water balance of the cut flower, prolong the vase life of the cut flower to 16.4 d, and maximize the flower diameter and the crown height.

Kiwi Fruit Fresh-keeping Technology

The vitamin C rich-kiwi fruit-the king of fruits-is good to taste but hard to store. Only a few countries can prevent mildew on the fruit stalk during the storage process. The fresh-keeping technology developed by the Shaanxi Teachers University has enabled China to catch up with the advanced countries in this field.

Fresh-Keeping Decision and Coordination of Fresh Agricultural Product Supply Chain Considering Carbon Cap-and-Trade under Different Dominance

In the context of low carbon,this paper discussed the impact of the carbon cap-and-trade policy on the fresh-keeping decision-making of two-echelon fresh agricultural product supply chains under different dominance,and designed cost-sharing contracts to coordinate the supply chain of fresh agricultural products dominated by suppliers and retailers respectively.The results showed that:dominance has no effect on the fresh-keeping decision and total revenue of fresh agricultural product supply chain,but it affects the internal income distribution,and dominance does not always bring more benefits;the implementation of carbon cap-and-trade reduces the fresh-keeping decision-making of fresh agricultural products supply chain and reduces the free-rider income of followers;the role of higher carbon trading price is twofold,which not only brings about the speculation of leading enterprises,but also promotes the application of low-carbon technologies;consumers’high preference for freshness,low-cost and high-efficiency low-carbon technology are all conducive to improving the fresh-keeping efforts and benefits of the supply chain;cost-sharing contracts can coordinate the supply chain of fresh agricultural products.

Study on the Preservation of Fresh Chinese Wolfberry Fruit at Room Temperature by Chitosan Coating

[Objective] The aim was to study the preservation of fresh Chinese wolfberry fruit via chitosan coating. [Method] Using Chinese wolfberry "Ningqi No. 1" as experimental material, the fresh fruits were coated by different concentrations of chitosan(0.75%, 1.00%, 1.25%, 1.50% and 1.75%) at room temperature to study the changes in weight loss rate, rate of rotten fruits rot, soluble solid content and vitamin C(Vc) content. [Result] Of all the treatments, the fruits coated with 1.25% chitosan showed lowest rate of rotten fruit and weight loss rate, and highest Vc and soluble solid content, presenting the optimal fresh-keeping effect. [Conclusion] Chitosan coating is helpful for the preservation of fresh Chinese wolfberry fruit at room temperature.

葡萄采后病害生物防治研究进展

对近年来国内外已筛选出的葡萄采后病害拮抗菌进行总结,简要介绍拮抗菌的筛选方法及来源,并对拮抗菌的抑菌机理研究情况进行综述。同时,对我国葡萄采后病害生物防治的现状及存在的问题进行概括,展望今后该领域的发展方向。

芒果果实采后生理研究进展

果实采收后仍是活的有机体,因此都会有一些生理生化的变化。就芒果果实采收后的呼吸强度、乙烯代谢、香气变化、相关酶类、软化研究及果实内含物变化进行了概述,并指出了进一步的研究方向。

图谱法在采后果蔬果胶分子结构研究中的进展

细胞壁中的果胶物质是维持果蔬质地的重要成分。阐明果蔬中果胶的结构及在贮藏中的变化对指导采后果蔬有重要意义。简述近年来应用较广的傅里叶变换红外光谱(FTIR)、基质辅助激光解吸电离质谱(MAlDI-MS)、核磁共振(NMR)、原子力显微镜(AFM)等图谱法的原理、优点以及它们在检测采后果蔬中果胶分子结构及变化的进展,并对果胶分子结构检测技术的发展方向进行展望。

热水预处理对中华寿桃采后品质的影响

研究了热水预处理对中华寿桃采后品质变化的影响。结果表明:适宜的热水预处理可以较好地抑制中华寿桃低温贮藏中,冷害导致的果肉褐变和组织绵化,对于保持桃子口味和贮藏后期果实的硬度、酸度也有较好效果。这种处理还具有延缓丙二醛含量的增加、保持总酚含量的良好作用。桃子果肉冷害褐变与多酚氧化酶活性的变化相关,热水预处理延缓了该酶活性的上升,降低了其峰值。冷害后果肉褐变越严重,总酚含量降低越多。热水预处理过度会降低其抑制果肉褐变的效果甚至加重褐变。

采后芦笋多酚类物质变化的研究进展

多酚是植物体内一种次生代谢产物,具有抗氧化、抗菌、抗肿瘤等生物功效,受到食品、营养、医学等领域科技人员的广泛关注和研究。芦笋富含多酚类化合物,是一种珍稀蔬菜,对人类膳食营养和疾病预防具有积极作用。综述了采后芦笋商业分级、多酚类等生物活性物质的变化及其影响因素,以期为芦笋的开发利用和食疗保健研究提供理论参考。

鱼腥草丁香普鲁兰多糖复配保鲜剂对柑橘青霉病及贮藏品质的影响

为开发新型安全的植物源柑橘保鲜剂,对5种中草药水提液进行抑菌试验,筛选出对柑橘青霉菌有较好抑制作用的中草药,并探讨鱼腥草丁香普鲁兰多糖复配保鲜剂对柑橘采后青霉菌抑制效果。丁香和鱼腥草水提液对柑橘青霉菌有较好抑制作用,抑菌率分别为73.45%和49.85%,对柑橘青霉菌的MIC分别为0.60 mg/mL和1.20 mg/mL,丁香和鱼腥草混合水提液抑制毒力较单一水提液的高,EC50为0.36 mg/mL。复配保鲜剂可有效抑制柑橘的发病率,在柑橘贮藏第9 d,比对照组CK发病率降低16.67%(p<0.05),但对失重率抑制效果不显著(p>0.05)。复配保鲜剂组有效延缓了果实可溶性固形物含量和可滴定酸度含量的增加,维持了较稳定的抗坏血酸含量,抑制了柑橘的呼吸强度。总之,丁香和鱼腥草水提液能有效抑制柑橘青霉菌菌丝体生长和孢子萌发,鱼腥草丁香普鲁兰多糖复配保鲜剂能提高柑橘对柑橘青霉病的抗性,该研究为开发新型安全的植物源柑橘保鲜剂提供理论支持。

Effect of Different Preservation Treatments on the Room Temperature Storage of “Gala” Apple

In this experiment," Gala" apples were used as test materials,and 1-MCP treatment and fresh-keeping film packaging were used for storage at room temperature.The results showed that the storage effects of 1-MCP treatment and fresh-keeping film packaging were better than those of the control.Moreover,1-MCP treatment was better than fresh-keeping film packaging in hardness,soluble solids content,titratable acid content,and inhibition of ethylene release.

Discussion on Refrigerator Fresh——Keeping Technologies

This paper analyzes the status and the development trend of refrigerator fresh-keeping technologies domestically and internationally, introduces several popular fresh-keeping technologies, elaborates on the principles and characteristics of several fresh-keeping technologies, and put forth that the future research should be focused on the different needs of customers.

Effects of Storage and Preservation of Postharvest Gonggan Mandarin(Citrus reticulata)Fruit Immersion in Salicylic Acid Combined with Calcium Chloride

[Objectives]To investigate the effects and mechanism of fruit immersion treatment with salicylic acid(SA),calcium chloride(CaCl_(2))solutions at different concentrations or their combinations on post-harvest preservation of Gonggan Mandarin(Citrus reticulata)fruit.[Methods]13 experiments(2 storage temperatures,3 control treatments,3 concentrations of SA solution,4 concentrations of CaCl_(2) solution and 3 combinations of SA+CaCl_(2) solution for fruit immersion treatment)were conducted for 90 d.Gonggan fruit weight loss rate,rotting rate,disease index,disease type,soluble solids and organic acids content,and the differences in the activity of six enzymes(APX,PPO,CHI,CAT,SOD,PAL)related to fruit disease resistance were detected regularly.[Results]With the increase of storage days,the weight loss rate,rotting rate and disease index increased,the content of soluble solids and organic acids decreased,the activity of APX,PPO,CHI and SOD increased,and the activity of CAT and PAL decreased.However,the increase or decrease of fruit loss at low temperature was the smallest,and the increase or decrease of fruit at natural room temperature was the largest.Gonggan fruit cleaning before storage is an effective preservation and fresh-keeping technology,but its preservation and fresh-keeping effect is far less than that of fruit immersion by SA,CaCl_(2) and SA+CaCl_(2) compound solution.The effect of fruit immersion by SA solution was greater than that of fruit immersion by CaCl_(2) solution;the best concentration of SA alone was 6.0 mmol/L,which was not significantly different from 3.0 mmol/L,but the effect of 9.0 mmol/L decreased;the best concentration of CaCl_(2) alone was 6.0 mmol/L,which was significantly better than 3.0 and 9.0 mmol/L;the optimal concentration combination of SA+CaCl_(2) compound solution for fruit immersion treatment was 6.0 mmol/L SA+3.0 mmol/L CaCl_(2).[Conclusions]The fruit immersion by SA,CaCl_(2) and their compound solutions induced the increase of activity of six enzymes related to disease resistance in Gonggan fruit,and PPO and CHI were judged to be two key enzymes based on response intensity.

Effect of sodium alginate/phosphate-stabilized amorphous calcium carbonate nanoparticles on chitosan membranes

Biodegradable chitosan(CS)films can meet the demand for sustainable development.However,the performance of pure CS membrane still exists a particular gap compared with the traditional film.Inorganic nanomaterials with the controllable release are added to improve its physical and chemical properties.Herein,a series of CS/phosphate-stabilized amorphous calcium carbonate(CS/ACCP)and CS/sodium alginate/ACCP(CS/Alginate/ACCP)composite films were prepared by the flow method.The effects of ACCP and Alginate/ACCP nanoparticles on the physical and chemical properties of the composite membrane were investigated.The results showed that the composite nanoparticles could significantly improve CS film’s compactness,hydrophobicity,and mechanical properties and enhance its ultraviolet(UV)blocking ability,water resistance,and water vapor blocking ability.When the number of nanoparticles was 8%,the mechanical properties of the CS composite membrane reached optimum value,and the comprehensive performance was better.In addition,the controlled-release properties of CS composite membranes were also studied,and the antioxidant,antibacterial,biocompatibility,and fresh-keeping effects of the composite membranes were explored.The results indicated that the CS composite membranes had not only excellent bacteriostatic(72%)properties(Escherichia coli)but also presented well fruit preservation(15 days)properties(sugar orange).In particular,the controlled release range of CS composite membrane at 12 h was between 30%and 90%,which provided a theoretical basis for its use as an edible membrane.Therefore,based on ACCP and Alginate/ACCP nanoparticles,CS composite membranes with more excellent application value in the biological field were prepared through further optimization design.