Antibacterial Effect of Nano-scale TiO_2 on Parasitic Bacterium of Nanfeng Citrus in Storage Period

[Objective] The aim was to observe the antibacterial effect of nano-scale Titanium dioxide on parasitic bacterium of Nanfeng Citrus in storage period.[Method] Nano-scale Titanium dioxide was prepared by dibutyl phthalate through sol-gel method under anhydrous conditions,and orthogonal experiment was used to determine optimum conditions for nano-scale Titanium dioxide preparation,and structure characterization of nano-scale Titanium dioxide was carried out by X-Ray diffractometer.Oxford cup method was used to explore inhibition effect of nano-scale Titanium dioxide suspension on the activity of normal parasitic bacterium of Nanfeng Citrus.Simultaneously,the empirical preservation test was carried out.[Result] The average diameter of nano-scale Titanium dioxide powder attained to 14.6 nm,actual average yield could reach 90.83% with RSD（Relative Standard Deviation）of 0.86%.[Conclusion] Nano-scale Titanium dioxide had good antibacterial effect on the parasitic bacterium of Nanfeng Citrus in storage period.

Antibacterial and Preservation Effects of Silver-doped TiO_2 Nanoparticles on Nanfeng Citrus

[Objective] This study aimed to investigate the antibacterial and preservation effects of silver-doped nano-TiO2 on Nanfeng citrus. [Method] Silverdoped nano-TiO2 preservative film was prepared, to investigate its preservation effects on Nanfeng citrus ripe fruits under novel preservation conditions and detect the influences of nano-composite coating on physiological quality indicators of Nanfeng citrus ripe fruits. [ Result ] Compared with the control, applying nano-compesite coating preservation technology could prevent fruit corruption and water loss and delay the rapid reductioh in contents of citric acid and Vc, without adverse influences on fruit quality. [ Conclusion] Silver-doped nano-TiO2 composite coating can be promoted and applied in frozen storage and preservation practices of Nanfeng citrus.

Preparation of Ag+/TiO2 Composite Coating Film for Preservation of Nanfeng Citrus

Using tetrabutyl titanate as the precursor, silver nitrate as the load agent, silver-doped titanium dioxide coating film was prepared by sol-gel method. Three agent samples were characterized by X-ray diffraction （XRD） analysis to investigate the crystal structure, which confirmed a synergistic antibacterial effect. The antibacterial and preservative effects of silver-doped titanium dioxide coating film on Nanfeng citrus were investigated preliminarily. Nutritional indicators of ripe Nanfeng citrus before and after preservation were detected to investigate the preservative properties of silver-doped titanium dioxide coating film and compare the effects of different components of composite coating film. The results showed that Ag＋/TiO2 composite coating film exhibited high antibacterial and preservative effects on Nanfeng citrus under visible light illumination condition.

Progress and Developmental Direction of Post-harvest Component Detection and Preservation Techniques of Nanfeng Citrus in China

This paper was summarized the research status and the development tendency of post-harvest component detection and preservation techniques of Nanfeng citrus in China, also analyzed the characteristics of various techniques, and proposed the developmental direction of novel techniques for post-harvest component detection and preservation of Nanfeng citrus.

Geographical classification of Nanfeng mandarin by near infrared spectroscopy coupled with chemometrics methods

Near infrared spectroscopy(NIRS),coupled with principal component analysis and wavelength selection techniques,has been sed to develop a robust and reliable reduced-spectrum classifi-cation model for determining the geographical origins of Nanfeng mandarins.The application of the changeable size moving window principal component analysis(CSMWPCA)provided a notably improved lassification model,with correct classification rates of 92.00%,100.00%,90.00%,100.00%,100.00%,100.00%and 100.00%for Fujian,Guangxi,Hunan,Baishe,Baofeng,Qiawan,Sanxi samples,respectively,as well as,a total dassification rate of 97.52%in the wavelength range from 1007 to 1296 nm.To test and apply the proposed method,the procedure was applied to the analysis of 59 samples in an independent test set.Good identification results(correct rate of 96.61%)were also received.The improvement achieved by the application of CSMWPCA method was particularly remarkable when taking the low complexities of the final model(290 variables)into account.The results of the study showed the great potential of NIRS as a fast,nondestructive and environmentally acceptable method for the rapid and reliable determination for geographical classifcation of Nanfeng mandarins.

Nondestructive assessment of quality of Nanfeng mandarin fruit by a portable near infrared spectroscopy

A portable near infrared spectroscopy system was developed for assessing the quality of Nanfeng mandarin fruit.One hundred and fifty-three Nanfeng mandarin samples were used to measure the performance of the system.Several pretreatment methods were adopted to process the spectra.Then Support Vector Machine(SVM),Back Propagation Neural Network(BPNN)and Partial Least Square(PLS)were used to build models for soluble solids content(SSC),titratable acidity(TA),vitamin C and surface color.The best results were obtained by SVM.The correlation coefficient(R)and root mean square error of prediction(RMSEP)were(0.93,0.65°Brix),(0.66,0.09%),(0.81,2.7mg/100g)and(0.57,0.81)for SSC,TA,vitamin C and color,respectively.The results demonstrated that the portable near infrared spectroscopy was feasible for determining the Nanfeng mandarin quality nondestructively.

咪鲜胺和百可得对南丰蜜橘保鲜效果的协同效应

为探究咪鲜胺和百可得复配浸果对南丰蜜橘的保鲜效果,本研究采用咪鲜胺(P)、百可得(B)及“咪鲜胺+百可得”(PB)处理南丰蜜橘,以清水浸泡为对照(CK),分别在室温贮藏(R)及4℃冷藏(C)下,每隔7 d测定南丰蜜橘的腐烂率、失重率及内在品质指标。结果表明,与CK相比,贮藏期内P、B及PB处理后的腐烂率及失重率均显著降低,室温贮藏下腐烂率分别平均降低10.8、7.9及12.4个百分点,失重率分别平均降低8.1、6.3及7.2个百分点;而冷藏下腐烂率分别平均降低3.5、1.8及4.5个百分点,失重率分别平均降低4.0、1.1及5.2个百分点。室温下经P与B处理后,维生素C及可溶性固形物含量总体高于CK及PB处理;可溶性总糖含量、糖酸比及固酸比均表现为P处理最高、B处理较低,PB及CK处理介于二者之间;可滴定酸含量与可溶性总糖含量、糖酸比及固酸比的变化规律相反。冷藏条件下经P、B及PB处理后,内在品质指标的总体变化规律不明显。综上,室温贮藏或冷藏下单一使用咪鲜胺或百可得均能显著提升采后保鲜效果,二者结合使用可协同延长货架期,其中室温下单一使用咪鲜胺果品更佳,而冷藏下药剂处理对果品无不利影响。本研究为咪鲜胺和百可得的保鲜机理及南丰蜜橘采后保鲜研究提供了理论支持。

南丰傩面具图案在箱包中的应用探究

作为传统民俗文化中的瑰宝,南丰傩面具的艺术底蕴和文化价值十分丰富。文章对南丰傩面具进行概述,阐析其艺术形态在造型、色彩、装饰方面的特征,分析南丰傩面具图案在箱包中的设计思路及原则,从图案适应箱包与服从箱包的角度进行对应的图案设计及应用研究。以皮革制品作为南丰傩面具艺术元素延续和传承的物质载体,将南丰傩面具艺术符号应用于现代箱包设计中,拓宽南丰傩面具艺术符号的开发思路和应用价值。

透水混凝土渗灌对南丰蜜橘产量品质及水分利用效率的影响

透水混凝土渗灌技术(PCII)是一种可将水分输送到作物深根的新型灌溉技术。为探知PCII的节水效果,并明晰其对果树产量及水分利用效率(WUE)的影响。以江西红壤丘陵区的南丰蜜橘为研究对象,通过大田灌溉控制试验,研究透水混凝土渗灌、漫灌(CK)和滴灌(DI)3种灌溉方式对土壤水分动态、南丰蜜橘果实生长、产量、品质及水分利用效率的影响。研究结果表明:相较于CK、DI,PCII灌溉方式下各土层的平均土壤体积含水率更高且波动幅度较小;与DI相比,PCII南丰蜜橘果实体积在幼果期、定果期、果实膨大期与果实成熟期分别增加0.79%~2.06%、0.35%~4.29%、1.18%~4.59%、0.38%~0.85%,生长速率在定果期、果实膨大期与果实成熟期分别增加1.21%~1.39%、1.29%~1.33%、0.93%~1.09%;与CK相比,糖度在果实膨大期与果实成熟期分别提高了11.47%~15.15%、13.70%~13.91%;与CK处理相比,PCII的产量、水分利用效率分别增加了15.69%~17.15%、43.13%~43.60%,与DI处理相比,PCII的产量、水分利用效率分别增加了1.58%~2.49%、4.84%~5.23%。因此,采用透水混凝土渗灌有助于提高红壤丘陵区南丰蜜橘的产量和品质,并实现水资源高效利用。

场景理论视域下南丰傩舞数字文创开发路径探究

赣傩文化作为江西省重要的民间文化是我国第一批享誉世界的国家级非物质文化遗产之一,蕴含着丰富的历史文化内涵和地域特色,其作为中国传统文化的重要组成部分,具有丰富的历史底蕴和独特的艺术表现形式。随着数字化技术的发展,赣傩文化在互联网时代展现出了新的活力。以南丰傩舞作为研究载体,基于场景理论的三个主维度探讨如何根据三维度进行南丰傩舞艺术数字文创设计开发路径探究,分析场景理论视域下数字化场景中南丰傩舞艺术的呈现方式,引入一个全新的视角为赣傩文化的传承发展作出贡献。

文化基因图谱建构的南丰傩面具图式再设计研究

目的以文化基因理论为基础,解读南丰傩面具所蕴含的文化基因中符合文化识别的因子,根据受众对因子的感知重要度,提出以符号为单位识别的文化基因表达方式。方法为量化评价傩面具的文化,通过提取南丰傩面具文化基因,运用AHP将定性和定量研究法相结合,构建文化基因谱系图——评价模型树。结果根据南丰傩面具文化基因图谱得出符号权重,通过拟态环境理论进行客观环境、信息选择、媒介加工、拟态环境四个层次分析具备品牌识别的符号,得出实质性的文化基因表达方式。结论从文化基因角度出发,以定性与定量研究相结合,有利于促进信息环境的形成,为南丰傩文化的传播增强文化认同感。

南丰蜜橘高接换种冻害发生气候风险区划

选用1958—2022年南丰县气象资料,从气候条件角度出发,分析低温冻害对南丰蜜橘高接换种的影响,由此确定南丰蜜橘高接换种发生冻害的有利气候条件指标。同时运用Arcgis对南丰县南丰蜜橘高接换种树体冻害发生气候风险区进行划分,主要划分为高风险、中风险、低风险、无风险4个风险区。无风险区包括白舍镇、紫霄镇小部分地区、付坊乡;低风险区包括白舍镇、紫霄镇、太和镇中北部地区、太源乡、桑田镇中南部地区;中风险区包括东坪乡、莱溪乡、洽湾镇、琴城镇、三溪乡、市山镇、桑田镇北部、太源乡北部、白舍镇及紫霄镇靠近三溪乡军峰山山区;高风险区主要为市山镇靠近军峰山地区及军峰山高海拔山区。

基于多元统计法的南丰蜜橘品质评价指标的选择

为简化南丰蜜橘果实品质系统评价指标,采用主成分分析和系统聚类法,以20个不同产地杨小-26南丰蜜橘为试材,对其单果质量、果形指数、出汁率、囊瓣数、化渣度、可溶性糖、可滴定酸、维生素C、可溶性固形物(SSC)等9个主要果实品质指标进行了分析。结果表明,在果实品质评价的9个主成分中,前6个主成分的累积贡献率达95.20%。将前6个主成分特征向量进行系统聚类分析,简化后的果实品质评价指标是:果形指数(或出汁率)、化渣度(或囊瓣数)、可滴定酸、维生素C、单果质量(或可溶性糖或可溶性固形物)。选取果形指数(或出汁率)、化渣度、可滴定酸、维生素C、可溶性固形物5个简化指标对南丰蜜橘品质进行聚类分析,在欧氏距离为1.0时,可将供试的20个不同产地南丰蜜橘分为4类,这一结果与实际口感评价结果吻合。

近红外光谱结合主成分分析鉴别不同产地的南丰蜜桔

采用近红外光谱结合主成分分析(PCA)建立不同产地南丰蜜桔鉴别模型,实现不同产地南丰蜜桔的快速鉴别。分别研究一个果园内不同位置的蜜桔,洽湾、市山和白舍等南丰县三个不同乡镇的南丰蜜桔,福建邵武、广西柳城和江西南丰等三个不同省份的南丰蜜桔之间的差异,蜜桔保存时间对主成分分析模型的影响。结果表明同一个果园内不同位置的蜜桔不存在明显差别,不同产地的蜜桔有很好的分类效果,蜜桔的短时间保存对近红外光谱的主成分分析模型不会产生明显影响。不同的光谱预处理方法对主成分分析模型产生较大影响,多元散射校正(MSC)结合二阶导预处理得到的主成分分析投影具有最佳的分类效果。该研究可为南丰蜜桔的产地鉴别提供一种参考方法。

南丰蜜橘品质评价指标的聚类分析

以20个不同产地"杨小-26"南丰蜜橘为试材,对其单果重、果形指数、出汁率、囊瓣数、化渣度、可溶性糖、可滴定酸、Vc、SSC等9个主要果实品质指标进行了观测。主成份分析结果表明,前6个主成份的累积贡献率达95.20%,将前6个主成份特征向量进行系统聚类分析,在最大距离为1.00时可划分为5个类别:可滴定酸、Vc单列为一类,果形指数与出汁率、化渣度与囊瓣数分别聚为一类,单果重、可溶性糖和SSC 3个指标同聚为一类。因此,简化后的5项果实品质评价指标可以反映南丰蜜橘品质的绝大部分信息,为科学评价南丰蜜橘果实品质提供了理论依据。

基于SSR标记技术的南丰柑橘种质资源亲缘关系研究

【目的】从分子水平探究南丰柑橘种质间的亲缘关系。【方法】应用SSR技术对28份南丰柑橘种质进行基因组的多态性分析。【结果】从91对引物中筛选得到13对SSR引物,可区分全部供试材料。共扩增得到64个等位基因,平均每个位点4.92个等位基因。以遗传相似系数0.18为界,金柑属金柑单独聚为1类,柑橘属27份供试样品聚为1类。以相似系数0.59为阈值,27份柑橘属供试种质分为5个类群,其中南丰蜜橘品种群(包含小果系、大果系、桂花蒂系、早熟系)所有20份供试种质与‘蜜广’聚为一类,‘小叶广’‘火广’‘火橘’聚为一类,‘红广’‘红橘’‘本地早橘’各为一类。【结论】南丰广橘品种群中‘蜜广’与南丰蜜橘品种群有较近的亲缘关系,而‘红广’与亲本南丰蜜橘和‘红橘’的亲缘关系均较远。‘小叶广’‘火广’和‘火橘’亲缘关系较近。

可见/近红外光谱的南丰蜜桔可溶性固形物含量定量分析

基于可见／近红外漫反射光谱定量分析技术对南丰蜜桔的可溶性固形物含量进行实验研究，采用偏最小二乘法对南丰蜜桔完整果和果肉的可见／近红外光谱进行了分析，并且比较和讨论了不同光谱预处理的建模结果，实验结果表明：在波长范围350—1800nm，一阶微分光谱所建模型效果最佳．其中完整果所建校正模型的预测相关系数为0．825和预测均方根偏差为0．899；果肉所建校正模型的预测相关系数为0．893，预测均方根偏差为0．749。

基于Logistic模型研究南丰蜜橘(Citrus reticulata Blanco)果实的生长动态

应用Origin软件对南丰蜜橘果实生长动态进行Logistic曲线拟合,并对拟合结果进行分析和验证。结果表明,南丰蜜橘单果重与果实发育时间可以用Logistic曲线方程拟合,南丰蜜橘各品(株)系果实单果重的Lo-gistic曲线方程相关系数大于0.95,并呈显著水平;南丰蜜橘小果系SS-28和小果系97-1的Logistic曲线方程的预测值与实测值的相关系数分别为0.9033和0.9444,并呈显著水平,标准误差分别为4.5063和3.2684。Logistic曲线能较好地反映南丰蜜橘果实的生长动态。

橙汁酿酒酵母菌株的分离筛选和发酵性能的测定

江西是中国著名的无公害柑橘生产基地之一,以南丰蜜橘为原料生产柑橘果酒,可以提高柑橘的附加价值,是柑橘深加工研究的方向之一。采用现代微生物实验技术,通过富集培养和分离技术,在橙汁平板培养基上分离出酿酒酵母的单菌落。通过进一步发酵鉴定经发酵性能测定和产品的感官评定,分离出1株菌种酵母菌(Yeast),编号为Y68。并利用该菌株对柑桔类果汁进行了一定的发酵性能实验,初步发酵证明酵母菌株Y68适合酿造柑橘果酒。

不同采收期对南丰蜜橘贮藏品质及效果的影响

为确定适于南丰蜜橘贮藏的合理采收期，以南丰蜜橘为试材，在温度为（5±1）℃、相对湿度为85％～90％贮藏条件下，研究不同采收期对南丰蜜橘果实贮藏品质及效果的影响。结果表明：贮藏110 d后，采收期Ⅰ和采收期Ⅱ的果实腐烂率（分别为0％和11％）极显著低于采收期Ⅲ的果实（28％），但采收期Ⅰ的果实失重率极显著高于采收期Ⅱ、Ⅲ的果实，高达11．28％；在贮藏前期，采收期Ⅰ的果实可溶性固形物（ TSS）、总糖、维生素C （ Vc）含量偏低，可滴定酸（ TA）含量偏高；在贮藏后期，其TSS、总糖含量高于采收期Ⅱ、Ⅲ的果实；较早采收的果实（采收期Ⅰ、Ⅱ）丙二醛（MDA）积累较少，呼吸强度较低，多酚氧化酶（PPO）活性较低，且有效的延缓了果实Vc、TA含量的下降。综合各项生理生化指标，采收期Ⅱ的果实贮藏品质优于采收期Ⅰ、Ⅲ的果实，为较适宜的采收期。