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.

抗菌素natamycin对酵母菌生长的影响

考察了natamycin对酵母菌生长繁殖的影响 ,确定了其最低抑菌浓度及最佳添加时间。结果表明 :natamycin对酵母的生长繁殖有明显的抑制作用 ,其最小抑菌浓度为 2 5 μg·mL-1;其抑菌效果与其浓度成正相关 ,与加入natamycin时酵母菌的初始活菌数成负相关 ;在酵母菌生长延迟期加入natamycin抑菌效果明显好于稳定期加入。

天然食品防腐剂Natamycin的生产工艺及应用

本文介绍了天然食品防腐剂Natamycin的生产工艺,对其进行了安全性评价,阐述了其在食品中的应用现状。

Antifungal efficacy of natamycin in experimental fusarium solani keratitis

AIM: To evaluate the efficacy of topical administration Natamycin, which is produced by China, in an experimental rabbit model of Fusarium solani keratitis, to provide experimental basis for the application of clinical safety. METHODS: Fusarium solani was induced in the right eye of 30 New Zealand rabbits. Forty-eight hours after inoculation, the animals were divided into 3 different treatment groups, 10 rabbit eyes of each group: Group 1 (Natamycin) treated with topical Natamycin, group 2 (Natacyn) treated with topical Natacyn, group 3 (control) treated with topical saline solution. The eyes of each group was examined clinically with slit lamp using ulcer scoring system on day 4, 10, 15, and 21 for status of healing, corneal vascularisation, iritis, hypopyon and macular nebula. The findings were recorded on day 10 and day 21. RESULTS: Ulcer score on day 10, day 15, day 21: The score of Natamycin group are 1.45 +/- 0.16, 1.08 +/- 0.11, 0.70 +/- 0.40. The score of Natacyn group are 1.35 +/- 0.12, 1.10 +/- 0.12, 0.65 +/- 0.35. the score of control group are 1.30 +/- 0.08, 3.63 +/- 0.28, 3.80 +/- 0.16. Natamycin group and Natacyn group were different from control group (P <0.01). There is no difference between Natamycin group and Natacyn group. Status of healing on day 10 and day 21: The cure rate of the Natamycin group is 90% on day 10, and 100% on day 21. The cure rate of the Natacyn group is 80% on day 10, and 100% on day 21.Natamycin group and Natacyn group were different from control group (P<0.01). There is no difference between Natamycin group and Natacyn group. Corneal vascularisation, iritis, hypopyon and macular nebula on day 10 and day 21: in Natamycin group, the number of the eyes which have Corner vascularisation, iritis, hypopyon and macular nebula are 2,0,0,2. In Natacyn group, the number of the eyes which have Corner vascularisation, iritis, hypopyon and macular nebula are 1,0,0,2. In control group, the number of the eyes which have Corner vascularisation, iritis, hypopyon and macular nebula are 9,9,8,9.Natamycin group and Natacyn group were different from control group (P<0.01). There is no difference between Natamycin group and Natacyn group. CONCLUSION: Natamycin was found to be effective in fungal keratitis, similar to Natacyn, and it can stop the corner vascularisation, iritis, hypopyon and macular nebula to happen. Natamyin manufactured in China is effective against fungal keratitis, with esay availability and low toxicity in its use.

Natamycin in the treatment of fungal keratitis : a systematic review and Meta-analysis

AIM: To review published clinical studies examining the effect of natamycin in the treatment of fungal keratitis.METHODS: We selected the publications in CENTRAL,MEDLINE, EMBASE, CNKI, and CBM. This study systematically reviewed published randomized controlled trials(RCTs) that compared natamycin to other antifungal agents, and conducted feasible Meta-analysis of efficacy results using Revman 5.2 software.RESULTS: We included seven trials which were mainly carried out in developing countries of Asia, with five trials conducted in India, one each in China and Bangladesh. A total of 804 participants were randomized to following comparisons: 2% econazole versus 5%natamycin showed little difference in the effects of treatment of fungal keratitis [RR =0.99, 95% confidence interval(CI), 0.8 to 1.21]; chlorhexidine gluconate versus5% natamycin indicated that the results on healing of the ulcer at 21 d was less conclusive(RR=0.77, 95% CI, 0.55 to 1.08; I2=0%); 1% voriconazole versus 5% natamycin suggested that natamycin treatment appeared to be significantly better outcomes than voriconazole(regression coefficient =-0.18 log MAR; 95% CI,-0.30 to-0.05; P =0.006), especially in Fusarium cases(regression coefficient=-0.41 log MAR; 95% CI,-0.61 to-0.20; P 【0.001);natamycin versus fluconazole showed a significant difference in cure rate(χ2=5.048, P 【0.05) and natamycin group was more effective than fluconazole in average period of therapy(t =7.94, P 【0.01).CONCLUSION: Natamycin was a preferable choice in the treatment of fungal keratitis, especially in the early period of Fusarium cases.

Space-flight Mutation of Streptomyces gilvosporeus for Enhancing Natamycin Production

Mutants of the strain producing natamycin, Streptomyces gilvosporeus, were obtained after space-flight mutation. With respect to the sand spores and slant spores, the mutation ratios were up to 67.6% and 78.3% and the survival ratio was 43.1% and 3.0%, respectively. An improved mutant producing natamycin, S. gilvosporeus LK-45, was screened, which showed natamycin productivity of 1420mg·L^-1. A mutant resistant to 2-deoxy glucose, S.gilvosporeus LK-119, was further obtained using a＇rational screening procedure. The natamycin productivity of 1940mg·L^-1 was achieved when glucose was used as the carbon source.

Nisin,Natamycin对调理狭鳕鱼片贮藏品质的影响

研究Nisin、Natamycin对调理狭鳕鱼片贮藏品质的影响。不同处理狭鳕鱼片在4℃冷藏条件下腌制24h后,测定其pH值、TVB-N值、组胺、大肠菌群及菌落总数。结果表明:Nisin和Natamycin对于调理狭鳕鱼片的pH值、挥发性盐基氮、微生物和组胺均优于空白样品;Natamycin对于调理狭鳕鱼片的pH值、微生物和组胺均优于Nisin处理的样品;Nisin对于调理狭鳕鱼片的挥发性盐基氮指标优于Natamycin;Nisin和Natamycin对冷藏调理狭鳕鱼片具有延长贮存期的特点,Natamycin的效果更为明显。分析得到结论:在0~4℃下,狭鳕鱼块的保质期在16天,两种抑菌剂使保鲜期延长了1~2天,相同状态下在这段时间的Natamycin效果略优于Nisin。

The Fluorescence Immunochromatographic Strips for Natamycin and Its Application in Food Safety Detection

A fluorescence immunochromatographic strip was developed in this study for natamycin detection in food. The results showed that the best amount of labeled antibody was 10 μg, for every 50 μl of fluorescent microspheres with a 2.5%(w/v) concentration. This labeled antibody was diluted for 10 times, and the diluted solution was dispensed into conjugate pad at the amount of 3 μl/cm. The concentrations of natamycin labeled BSA for test line and goat anti-mouse IgG for control line were 2.0 and 1 mg/ml, respectively, which performed best. With the best conditions, the limit of detection was 1 ng/ml, the linearity ranged from 2 to 100 ng/ml, the recovery was about 80% to 120%, and the CV was below 23%.

Development and Characterisation of Natamycin Mini-Matrices Prepared by Hot-Melt Extrusion for Vaginal Delivery

In this study, bioadhesive mini-matrices of natamycin were prepared for vaginal application by hot-melt extrusion. In addition, melt viscosity measurements, thermogravimetric analysis, in vitro drug release studies and in vitro mucoadhesion test were performed. High molecular weight grades of KlucelTM hydroxypropylcellulose were used as a thermoplastic polymer. TEC and PEG 400 were chosen as plasticizer. According to the obtained results of melt viscosity measurements, the maximum torque of extrudates prepared using PEG 400 increased with increasing drug loading. The thermo-gravimetric analyses showed that natamycin is stable up to 198℃ and this result gives the opportunity to hot melt extrussion process at 90℃. In vitro drug release results showed that the release was extended up to 72 hours and drug release rate increased with increasing drug loading. In respect to the in vitro mucoadhesion test results, the values of work of mucoadhesion were found high as 771,977 mN.mm, 753,199 mN.mm, 686,356 mN.mm for the prepared hot melt extruded mini-matrices. Our results showed that the developed formulations were found worthy of further studies.

Combined Application of 5% Natamycin and 0.2% Fluconazole for the Treatment of Fungal Keratitis

Purpose: To observe the clinical efficacy of combined use of 5% natamycin and 0.2% fluconazole for the treatment of fungal keratitis. Methods:A total of 65 cases diagnosed with fungal keratitis by direct smear and/or fungus culture from January 2010 to January 2013 were enrolled in this study.The duration from the onset of symptoms to admission to our ophthalmic center ranged from 9 to 90 d (mean 29.5 ±19.1 d) in the severe group, which significantly differed from the 7 to 36 d (mean 16.6±7.1 d) in the non-severe group (P<0.01). All cases were divided into non-severe and severe groups based on the degree of corneal inflammation. All cases were treated with topical use of 5% natamycin and 0.2% fluconazole once per hour. The same clinical and examination protocols were adopted for both groups. Results:In the non-severe group,23 of the 24 patients (95.8%) were healed, and 1 (4.2%) showed treatment effica cy. In the severe group,12 of 41 patients (29.3%) were healed, 11(26.8%) showed clinical efficacy, and 18(43.9%) showed no efficacy. The patients between two groups significantly differed in terms of efficacy (P<0.01). Conclusion:Combined use of 5% natamycin and 0.2% fluconazole is efficacious in treating fungal keratitis, especially mild or moderate infections.

Natamycin及其在食品中应用的研究

介绍了 Natamycin的性质、特点、防腐作用及其在食品中的应用。

Natamycin的生物学性质及其在乳品工业中的应用

阐述了Streptomyces natalensis次级代谢产物——Natamycin的生物学性质、抑菌机理、安全性及其在乳制品中应用的最新研究进展。Natamycin抑制(杀灭)真菌具有广谱、高效的特点,是一种极具发展潜力的天然生物食品防腐剂。

纳他霉素(Natamycin)的特性、应用及生产和研究状况

介绍了纳他霉素作为新一代天然生物防腐剂的特性、作用机理、安全性。在应用方面,纳他霉素以具有用量低、pH值使用范围广、热稳定性及防腐效果好等优点在食品工业中呈现出广阔的应用前景。详述了当前纳他霉素的生产及研究状况。

纳他霉素高产突变菌株高通量筛选方法的建立

为了提高纳他霉素(natamycin)高产菌株诱变后的筛选效率,建立一种24孔深孔板/酶标仪发酵初筛和摇瓶发酵复筛的高通量筛选检测方法,得到在24孔深孔板发酵结果与摇瓶发酵有很好的一致性,证实了酶标仪检测可以替代高效液相色谱法检测用于突变菌株的快速高通量筛选。以褐黄孢链霉菌(Streptomyces gilvosporeus TUST01)作为出发菌株,通过多轮的紫外诱变、常压室温等离子体(atmospheric and room temperature plasma,ARTP)以及硫酸二乙酯复合诱变、孔板初筛与摇瓶复筛,从887株突变株中筛选出遗传性稳定的高产菌株S. gilvosporeus Y-4-75,其摇瓶纳他霉素产量(5.95 g/L)与生物量(29.19 g/L)较出发菌株分别提高了31.93%和15.19%。

Application of a chitosan coating as a carrier for natamycin to maintain the storage quality of ground cherry(Physalis pubescens L.)

Ground cherry(Physalis pubescens L.) is a kind of berry fruit favored by consumers in China; however, this fruit is particularly vulnerable to physiological senescence and pathogen attack during the traditional cold storage period. In order to maintain storage quality, a 1.5%(w/w) chitosan(CS) water solution containing 50 mg/L of natamycin(NA) was introduced. After all treatments were completed, the fruit was stored at 0°C and sampled every 10 d. At each sampling date, the following tests were performed: mold and yeast analyses; enzyme activity and content analyses which included superoxide dismutase(SOD), ascorbate peroxidase(APX), and malondialdehyde(MDA); and color analysis. In addition, a sensory evaluation was carried out for quality assessment at the end of the storage period. The results showed that the application of a chitosan coating combined with natamycin(CSNA) enhanced the activity of superoxide dismutase(SOD) and ascorbate peroxidase(APX), reduced the physiological rate of senescence, and inhibited pathogen attack. Thus, CSNA treatment can maintain ground cherries at an acceptable level of storage quality for 50 d.

生物源保鲜剂对蛋糕保鲜效果研究

为提高蛋糕的食用安全性,选用3种生物源保鲜剂(ε-聚赖氨酸、乳酸链球菌素、纳他霉素)来延长蛋糕的保质期。以戚风蛋糕为研究对象,通过单因素试验考察ε-聚赖氨酸、乳酸链球菌素、纳他霉素单独使用时的保鲜效果,通过响应面试验优化3种防腐剂共同使用时的最佳使用量,并与蛋糕中常用的山梨酸钾、脱氢乙酸钠做效果对比。结果表明:单独使用时,纳他霉素、ε-聚赖氨酸可显著降低蛋糕的霉菌总数,乳酸链球菌素、ε-聚赖氨酸可显著降低蛋糕的菌落总数;三者共同使用时的最佳用量为:加入0.106 g/kgε-聚赖氨酸,外喷0.108 g/L乳酸链球菌素、0.114 g/L纳他霉素。三者配合使用,可显著延长蛋糕保质期,使蛋糕在37℃下的保质期由原来的2 d延长至5 d,效果优于山梨酸钾、脱氢乙酸钠。该研究为生物源保鲜剂在蛋糕中的应用提供了一定的理论参考,为蛋糕的防腐保鲜开拓了新途径。

那他霉素滴眼液与伏立康唑滴眼液对真菌性角膜炎患者的作用对比研究

目的研究比较真菌性角膜炎患者使用那他霉素滴眼液、伏立康唑滴眼液治疗的作用。方法将2020年10月至2022年10月期间在河南大学第一附属医院接收的50例真菌性角膜炎患者作为研究对象,按照完全随机设计法分成常规组和试验组,每组各有患者25例。常规组予伏立康唑治疗,试验组予那他霉素治疗,比较两组治疗后病情控制率、症状改善时间、溃疡面积、视力及眼表疾病指数量表(OSDI)评分。结果试验组病情控制有效率(96.00%)高于常规组(76.00%),差异有统计学意义(P<0.05)。试验组症状改善时间短于常规组,差异有统计学意义(P<0.05)。治疗后,两组溃疡面积均有明显降低,且实验组低于常规组,差异有统计学意义(P<0.05)。治疗后,两组视力水平显著提高、OSDI评分显著降低,且试验组高于常规组,OSDI评分低于常规组,差异有统计学意义(P<0.05)。结论真菌性角膜炎患者采用那他霉素滴眼液治疗的整体效果优于伏立康唑滴眼液,能快速控制症状、减少溃疡面积、提高视力及减轻角膜受损程度。

原生质体紫外-氯化锂复合诱变纳他霉素高产菌株的研究

本研究采用原生质体紫外-氯化锂复合诱变育种技术,以褐黄孢链霉菌为出发菌株,成功筛选出三株产纳他霉素能力较高且遗传稳定的突变菌株。实验发现,复合诱变最佳条件为氯化锂质量分数0.5%和紫外照射时间90 s,该条件下选出的三株产量较高的突变菌株,其摇瓶发酵液中纳他霉素平均产量为3 977 mg/L,较原始菌株提高32.5%。经连续五次传代后,突变菌株遗传性状稳定,且在300 L发酵罐中,SG-14突变菌株发酵液中纳他霉素产量最高,达4 176 mg/L,产量较出发菌株提升35.9%,周期缩短15 h。该育种技术显著提高生产菌发酵效率,对工业化生产和工艺改进具有重要价值。

高效液相色谱法测定糕点和果汁中纳他霉素的方法学验证

为了验证宝鸡市食品药品检验检测中心是否有能力开展纳他霉素新方法《食品安全国家标准食品中纳他霉素的测定》(GB 5009.286—2022)的检测项目。本文使用高效液相色谱仪,对糕点和果汁中纳他霉素进行分析,外标法定量,验证了本方法的线性关系、方法检出限、精密度和回收率。结果表明,纳他霉素在0.5~10.0μg·mL^(-1)呈现良好的线性关系,方法检出限、精密度和回收率均能达到标准方法要求。因此,本实验室具备检测纳他霉素的能力。

那他霉素关键杂质的制备及其结构鉴定

目的分离纯化那他霉素关键工艺杂质,并鉴定其结构,为那他霉素工艺和质量控制奠定基础。方法采用色谱纯化技术,分离制备那他霉素粗品中的关键杂质,经LC-MS和NMR分析鉴定杂质结构。结果建立了那他霉素工艺杂质的分离纯化方法,制备得到了3个杂质化合物,并通过波谱分析鉴定了化合物结构,其中杂质1为那他霉素的C2位差向异构体;杂质2为那他霉素的C18位甲氧基取代产物;杂质3为那他霉素三元氧环开环后脱去羟基形成的双键产物。结论杂质化合物与那他霉素具有相似的骨架结构,均由那他霉素生产过程产生,为那他霉素原料药的生产工艺开发和质量控制提供了技术参考。