柚皮提取膳食纤维   总被引：4，自引：0，他引：4  

潘雪峰  杨明非  赵长全 《东北林业大学学报》2005,33(2):110-111

用柚皮为原料,同时获得两种膳食纤维产品,产品1——总果胶(TP);产品2——膳食纤维。首先采用稀盐酸萃取,乙醇沉淀工艺提取果胶(TP)。水解条件：温度95℃,时间1h,pH=1．5,液料比100mL(酸提取液)：1g(干柚皮);沉淀条件为：滤液pH=7,乙醇与萃取液比例约为1：1,得产品1。滤渣经处理后,得产品2。100份干柚皮,可得总果胶29．74份,膳食纤维22.96份(其中含NDF即有效成分76．63％),原料利用率为52．70％;而相应的鲜样可得总果胶30．45份,膳食纤维20．36份(其中含NDF即有效成分高达87．29％),原料利用率为50．8l％。鲜柚皮提取的果胶颜色更浅,质量更好。  相似文献   

Isolation and partial characterization of a pectic polysaccharide from the fruit pulp of Spondias cytherea and its effect on peritoneal macrophage activation     

Iacomini M  Serrato RV  Sassaki GL  Lopes L  Buchi DF  Gorin PA 《Fitoterapia》2005,76(7-8):676-683

The total carbohydrate content of the intact pulp of Spondias cytherea was 41%. Polysaccharides were obtained via hot aqueous extraction after defatting with organic solvents. The aqueous extract was treated with excess ethanol to form a precipitate, which was then solubilized in water. The material precipitated upon acidification when HCl was removed. The resulting supernatant fraction was submitted to freeze-thawing treatment yielding a soluble fraction (sFTS). This fraction had Ara, Rha, Gal and GalA in its structure as determined by GC-MS. 13C NMR analysis showed signals assigned to alpha-L-Araf, beta-D-Galp, alpha-D-GalpA and alpha-L-Rhap units, in addition to galacturonic acid units, which were present also as methyl ester. These results suggest a type I rhamnogalacturonan with arabinogalactan branches. Cell eliciting activity in a dose-depending pattern was observed in vitro on peritoneal macrophages treated with sFTS.  相似文献   

低温贮藏对菠萝细胞壁降解的影响   总被引：8，自引：0，他引：8  

屈红霞  唐友林  谭兴杰  潘小平  刘林 《园艺学报》2000,27(1):23-26

菠萝在贮藏过程中PG、PE活性升高 ,水溶性糖醛酸含量增加 ,硬度降低 ,同时果肉组织细胞表现为细胞壁微纤丝层次性排列被破坏 ,中胶层电子密度降低。低温可延缓水溶性糖醛酸含量的增加和硬度的下降 ,抑制PG和PE活性 ,从而抑制细胞壁的降解。  相似文献   

Fruit yield and quality of strawberry plants transformed with a fruit specific strawberry pectate lyase gene     

Sabry M. Youssef  Silvia Jiménez-Bermúdez  M. Luz Bellido  Carmen Martín-Pizarro  Marta Barceló  Samia Abdallah Abdal-Aziz  José L. Caballero  José M. López-Aranda  Fernando Pliego-Alfaro  Juan Muñoz  Miguel A. Quesada  José A. Mercado 《Scientia Horticulturae》2009

Two transgenic strawberry lines (Pel 1 and Pel 3) containing the open reading frame of a fruit specific strawberry pectate lyase gene (FaplC) under the control of the CaMV35S promoter have been obtained to evaluate the role of this gene on fruit softening. Ripen fruits from both lines showed a significant down-regulation of FaplC, being the percentage of silencing of 84 and 71% on Pel 1 and Pel 3, respectively. The agronomic behaviour of transgenic plants was evaluated during two consecutive years. Fruit set increased in the two transgenic lines when compared with control plants, although Pel 1 showed a significant reduction on fruit weight. Firmness of full ripen fruits from Pel lines was significantly higher than control fruits, while color and soluble solids were not affected. The increase of firmness in Pel lines was maintained when ripe fruits were stored for 3 days at 25 °C. Histological analysis of ripe fruits showed lower intercellular spaces and a higher degree of cell to cell contact area in transgenic fruits when compared with controls. Altogether, these results suggest a direct relationship between pectate lyase gene expression and strawberry fruit softening.  相似文献   

叶面喷施Ca( NO₃) ₂ 和GA 对‘糯米糍’荔枝裂果的影响   总被引：7，自引：1，他引：7  

彭坚  席嘉宾  唐旭东  王玉国  司雪梅  陈家森 《园艺学报》2001,28(4):348-350

 以果实易裂品种‘糯米糍’荔枝为材料, 研究叶面喷施Ca (NO₃) ₂ 和GA 处理对其裂果的影响。结果表明: Ca (NO₃) ₂和GA 处理均能使裂果率明显降低。果实发育初期, 果皮中原果胶和水溶性果胶的含量均有所升高, 且原果胶含量的增高幅度明显; 随着果实的成熟, 可溶性果胶含量有所降低, 原果胶含量大幅度提高。此外, 除果实成熟期外, 果皮内果胶脂酶(PE) 和多聚半乳糖醛酸酶(PG) 的活性一直有上升趋势, 且PG的活性与水溶性果胶的含量有极显著正相关, 而纤维素酶(CX) 在整个果实发育期都表现出较高的活性且有两次明显的高峰。  相似文献   

Utilization of fluted pumpkin fruit ( Telfairia occidentalis) in marmalade manufacturing     

Egbekun  M. K.  Nda-Suleiman  E. O.  Akinyeye  O. 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,52(2):171-176

Marmalade was produced from fluted pumpkin ( Telfairia occidentalis) fruit. The fruit was pulped, boiled and filtered to obtain pectin extract. The extract was boiled at 102 °C for 30 min with the pH and sugar levels adjusted to 3.2 and 68.5 °Brix, respectively. Fruit shreds were added towards the end of boiling. Results of analyses showed that the pulp is rich in Na, K, Fe, P, Mn and pectin (1.01%), but low in protein (0.86%). The marmalade had a firm gel and was acidic (pH 3.15). Mold was absent and syneresis did not occur. The marmalade contained 68.5% total soluble solids and set at 52–56 °C. Sensory evaluation showed no significant difference (p = 0.05) in taste, consistency, spreadability and overall acceptability between fluted pumpkin marmalade and commercial orange marmalade. Both chemical and sensory results denote that the marmalade was highly desirable and compared favourably with similar preserves produced in Nigeria.  相似文献   

利用果胶酶降解烟叶中果胶的研究   总被引：2，自引：1，他引：2  

于建军  马海燕  杨寒文  董高峰 《江西农业学报》2009,21(3)

为降低烤后烟叶中的果胶含量,改善果胶对烟叶品质的不良影响,研究了果胶酶的不同用量对烟叶果胶含量、化学成分以及中性致香物质的影响。结果表明:果胶含量随外加酶量增加而减少,总糖含量随外加酶量增加而增加;方差分析结果表明,各加酶处理的总糖含量均与对照达到极显著水平,个别加酶处理的果胶含量与对照达到极显著水平;果胶酶用量为100 U/g时,可以使烟叶中的中性致香物质总量提高29.94%,有利于烟叶香气质和香气量的改善。  相似文献   

超声波辅助提取苹果皮中果胶的研究     

岳贤田 《安徽农业科学》2011,(5):3055-3057

[目的]探讨采用超声波辅助提取苹果皮中果胶的工艺条件。[方法]采用超声波辐射萃取法从苹果皮中提取了果胶,并采用单因素试验研究了不同萃取剂、溶剂、超声时间、超声波辐射功率、料液比、乙醇浓度及提取液pH值对果胶提取率的影响。[结果]确立了超声波条件下提取果胶的最佳工艺条件为：用盐酸调pH值为1.8,用水作为溶剂,料液比为1∶20,超声波功率为600W,超声波辐射时间为40 min,乙醇浓度为60%。该工艺条件下,果胶提取率可达12.9%。[结论]为综合利用资源及利用超声波提取苹果皮中果胶提供了一条可行性途径。  相似文献   

苹果双向变动气调贮藏初步研究   总被引：8，自引：0，他引：8  

祁寿椿  刘愚 《中国农业科学》1989,22(4):88-93

 将苹果贮藏在不同温度和不同气体成分组合条件下，定期测定果实的品质和生理生化变化。结果表明，贮藏期间（150-180天）同时变动温度和气体成分，温度从10-15℃降至0℃，CO#-2从12-15%降至6-8%，O#-2为3%，获得很好的保鲜效果。这种处理中果实硬度保持在12磅/厘米#+2以上，显著抑制了果实内乙烯生成和果胶水解。这类贮藏技术建议称为“双向变动气调贮藏”。  相似文献   

从不同原料中提取果胶工艺的研究综述   总被引：2，自引：0，他引：2  

潘虹 《安徽农学通报》2009,15(3):73-75

简述了果胶的结构和化学性质以及主要提取方法,并对近几年来国内外从不同原料中提取果胶工艺条件的研究进行综述。  相似文献