共查询到19条相似文献,搜索用时 312 毫秒
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采用超声波辅助浸提法制备小麦麸皮可溶性物质和不溶性膳食纤维,并研究了不同干燥方式对不溶性膳食纤维理化性质的影响。在膨胀力方面,经过低温真空干燥的膳食纤维大于经过真空冷冻干燥的;在吸附脂肪方面,经过低温真空干燥的膳食纤维小于经过真空冷冻干燥的,而且小麦膳食纤维吸附饱和脂肪的能力明显强于吸附不饱和脂肪的能力。在吸附亚硝酸根方面,受体系的pH值影响较大,在pH值为7时,小麦膳食纤维基本不吸附亚硝酸根;而在pH值为2时,溶液中残留的亚硝酸根的含量随时间呈现明显减小的趋势,低温真空干燥处理的吸附亚硝酸盐的能力强于冷冻真空干燥所制备的膳食纤维。 相似文献
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本实验以西番莲果皮中湿法改性膳食纤维为原料,探讨了热风干燥、微波干燥、真空冷冻干燥、喷雾干燥和冷冻喷雾干燥五种干燥方式对其色泽形貌、粉体性质及理化性质的影响。结果表明,湿法改性后,纤维组织破坏严重,再经不同干燥方式处理,膳食纤维的形貌和色泽都产生很大变化;真空冷冻干燥和冷冻喷雾干燥处理的膳食纤维表现出极佳的持水力、持油力及吸湿性,结果分别为:持水力24.1、16.4 g/g;持油力11.8、8.3 g/g;吸湿性19.3%、19.8%;真空冷冻干燥和冷冻喷雾干燥振实密度较小,其分散性、溶解性和吸附性能较佳;喷雾干燥处理的膳食纤维休止角为38.5°,表现出最佳的流动性;另外各处理间的膨胀力和阳离子交换能力差异不明显。综上,真空冷冻干燥和冷冻喷雾干燥处理对西番莲果皮中湿法改性膳食纤维品质改善最为显明显。 相似文献
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选取粒度大小在100~120目的小麦膳食纤维为原料,对其持水力、膨胀力及吸附特性进行研究,旨在为小麦膳食纤维合理开发利用提供一定的理论依据.研究结果表明:该粒度的小麦膳食纤维的持水力为4.21 g/g、膨胀力为3.25 mL/g;吸附饱和脂肪的能力为4.72 g/g,吸附不饱和脂肪的能力为2.37 g/g;pH=2时吸附胆固醇的能力为2.01 mg/g,pH=7时吸附胆固醇的能力为3.28 mg/g;pH=2时吸附NO2-的能力为31.98 μmoL/g,pH=7时基本不能吸附NO2-. 相似文献
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研究酶法和化学法制备的西番莲种子膳食纤维的膨胀力、持水力、结合水力、脂肪结合能力、胆酸钠和胆固醇吸附能力,并比较了两者在净产率、外观形态和物化性质方面的差异。结果表明:酶法制备的膳食纤维净产率为60.31%,具有纯度高、颗粒均匀的特点,在持水力、饱和脂肪酸结合力和胆酸钠吸附能力方面都高于化学法制备的样品;而化学法提取的纤维净产率为50.21%,在膨胀力、结合水力和不饱和脂肪酸结合力方面较有优势。 相似文献
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工艺条件对柠檬皮渣膳食纤维物理特性的影响 总被引:1,自引:0,他引:1
目的:以柠檬皮渣为原料制备膳食纤维,探讨原料预处理工艺、干燥方式和产品细度等因素对柠檬皮渣膳食纤维物理特性的影响。方法:测定不同工艺条件下制备的膳食纤维的物理特性,以此作为评价指标。结果表明,干燥前对原料进行热烫可显著改善产品的持水力、膨胀力、黏度和色泽,冷冻干燥可制备持油力高、黏度好、色泽好的柠檬皮渣膳食纤维,16目膳食纤维的持水力、持油力和膨胀力明显好于80目产品,而80目产品的黏度和色泽则明显好于16目产品。结论:原料预处理工艺、干燥方式和产品细度均显著影响成品膳食纤维的物理特性。 相似文献
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为了探究红枣果汁果渣与果酒果渣膳食纤维功能特性的差异,以红枣果汁果渣和果酒果渣为原料制备膳食纤维,通过测定膳食纤维的持水力、膨胀力、溶解性、持油力、阳离子交换能力以及吸附胆固醇、胆酸钠、葡萄糖能力,评价红枣果汁果渣与果酒果渣膳食纤维的功能特性。结果表明:红枣果酒果渣膳食纤维的持水力、膨胀力、溶解性、持油力、阳离子交换能力以及吸附胆固醇、胆酸钠、葡萄糖能力均显著高于果汁果渣膳食纤维(P<0.05),且随发酵天数延长,红枣果渣膳食纤维的功能特性均逐渐增加。发酵8 d时,果酒果渣膳食纤维持水力、膨胀力、溶解性、持油力、阳离子交换能力以及吸附胆固醇、胆酸钠、葡萄糖能力较果汁果渣膳食纤维分别提高了1.10、1.11、1.75、1.39、2.03、1.49、1.10和1.83倍,表明发酵有助于提高红枣果渣膳食纤维的功能特性。 相似文献
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采用正交试验对玉米皮渣中黄色素的提取工艺进行了优化。用提取了黄色素的玉米皮渣残留物制备了膳食纤维,并研究了膳食纤维的理化性质。试验结果表明:玉米皮渣中黄色素提取工艺为:以95%乙醇为提取剂,提取温度为70℃,提取时间为1.5h,料液比为1:12.5。玉米膳食纤维有一定的持水力和膨胀力。玉米膳食纤维吸附饱和脂肪的能力强于吸附不饱和脂肪的能力。玉米膳食纤维吸附亚硝酸根离子的能力在不同的pH值下有所不同.在pH值2时的吸附能力较强,而在pH值7时其吸附力较低。 相似文献
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为研究不同干燥方式对苜蓿超微粉物化特性及抗氧化活性的影响,以苜蓿超微粉总色差为指标,采用正交实验法,确定苜蓿超微粉的最佳护色方法,优化热风干燥工艺参数;通过测定苜蓿超微粉粒度、溶解度、持水力、持油力、DPPH自由基清除率等理化指标,比较热风干燥和真空冷冻干燥得到的苜蓿超微粉之间的物化特性和抗氧化活性差异。结果表明,采用热风干燥法干燥苜蓿的最佳工艺参数为:干燥温度70℃、干燥时间8 h,护色剂为0.15% L-半胱氨酸时,此条件制备的苜蓿粉具有较好的物化性质。并且苜蓿超微粉粒度的减小能明显提高苜蓿粉的抗氧化活性。真空冷冻干燥苜蓿超微粉具有很好的物理化学特性,经过干燥粉碎后能够很好的保留其中的营养价值和抗氧化活性,但其时间和能源消耗较大;而热风干燥苜蓿粉的物化特性及抗氧化活性相对较差,但其干燥时间短,能源消耗较少。 相似文献
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采用热风干燥、微波真空干燥、变温压差膨化干燥及真空冷冻干燥技术制备金针菇菇根粉,研究不同干燥方式对金针菇菇根粉物理性质的影响。结果表明:真空冷冻干燥粉体色泽保持最好,其次是微波真空干燥和变温压差膨化干燥;真空冷冻干燥和微波真空干燥粉体粒度和跨度较小,且粒度更均匀。热风干燥和变温压差膨化干燥粉体流动性及压片成型性较好;微波真空干燥和真空冷冻干燥粉体持水能力较强,真空冷冻干燥粉体持油力最强,达1.8 g/g;热风干燥和变温压差膨化干燥粉体水溶性较强,微波真空干燥最弱。真空冷冻干燥和微波真空干燥金针菇菇根粉适宜作为功能原料添加到食品中或吸附在食品表面。热风干燥和变温压差膨化干燥菇根粉适宜压制片剂及进行可溶性成分提取。 相似文献
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Prawta Chantaro 《LWT》2008,41(10):1987-1994
The feasibility study of using carrot peels, by-products from food industry, as a starting raw material to produce antioxidant dietary fiber powder was investigated in this work. The effects of blanching and hot air drying (60-80 °C) on the drying kinetics and physicochemical properties of dietary fiber powder were first evaluated. The results showed that blanching had a significant effect on the fiber contents and compositions, water retention and swelling capacities of the fiber powder. In contrast, drying temperature in the selected range did not affect the hydration properties. In terms of the antioxidant activity, thermal degradation during both blanching and drying caused a decrease in the contents of β-carotene and phenolic compounds, hence leading to the loss of antioxidant activity of the final product. 相似文献
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Saranya Jongaroontaprangsee Watcharee Tritrong Wongsapat Chokanaporn Pawadee Methacanon Sakamon Devahastin 《International Journal of Food Properties》2013,16(4):887-897
The use of by-products from fruit and vegetable processing plants as sources of dietary fiber and bioactive agents is currently of interest, both from the waste management and from the production of value-added products points of view. This work aimed at studying the use of lime residues and outer leaves of white cabbage to produce dietary fiber powder, which included the study of the product pretreatment and preparation, drying, and grinding dried residues into powder. Dietary fiber content during each processing step was determined to calculate the loss of functionality of the products through the process. Hydration properties, i.e., water holding capacity (WHC) and swelling capacity (SWC), of the two residues were also determined after hot air drying at 60–80°C. The effect of particle size of dietary fiber powder, which was obtained by grinding dried residues, in the range of 63–450 μm, on the hydration properties was also evaluated and discussed. 相似文献
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为促进芸豆渣的综合利用,对豆渣进行发酵改性,以改善其基本结构并提高其物化特性。利用复合菌系进行发酵,响应面优化制备工艺,分离可溶性膳食纤维和不溶性膳食纤维,对发酵前后的膳食纤维进行表观结构及物化特性的分析。发酵可溶性膳食纤维含量为17.47%,提高了11.84%,发酵后膳食纤维含量提高了2.81%。发酵后不溶性膳食纤维的持水力、持油力及膨胀力分别提高了2倍、6倍、1.9倍,吸附性及离子交换能力皆显著优于未处理的不溶性膳食纤维,发酵后可溶性膳食纤维的抗氧化能力也显著提高。发酵后的不溶性膳食纤维的微观结构褶皱更明显,发酵后的可溶性膳食纤维的颗粒明显增多变小且结构呈紧簇蜂窝状,红外光谱图也表明豆渣膳食纤维具有膳食纤维特有组分。发酵后的豆渣膳食纤维微观结构及物化特性皆有较明显地改善,其具备作为优质膳食纤维地潜能。 相似文献
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通过单因素试验和正交试验,探讨了乳酸菌发酵法制备苦竹笋膳食纤维的发酵条件.结果表明:在竹笋浆中加入3%脱脂奶粉和0.5%蔗糖,接入4% (v/v)的嗜热链球菌与保加利亚乳杆菌配比为1∶ 1的发酵剂,在41℃条件下恒温发酵20h,有最高的总膳食纤维和可溶性膳食纤维收得率.将发酵浆汁过滤、真空干燥、粉碎,制得的苦竹笋膳食纤维产品呈乳白色、口感细腻、有苦竹特有的清香风味,其持水力为8.43g/g,溶胀性为3.52mL/g,总膳食纤维和可溶性膳食纤维含量分别为76.87%、15.73%. 相似文献
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Inmaculada Navarro-GonzálezVerónica García-Valverde Javier García-AlonsoMª. Jesús Periago 《Food research international (Ottawa, Ont.)》2011,44(5):1528-1535
Tomato processing residue is defined as a secondary raw material that can increase its value, being considered a potential source of dietary fiber and bioactive compounds. Commercial tomato peel fiber has been analyzed to ascertain the proximate and nutritional composition (moisture, fat, protein, dietary fiber, ash, and minerals), the fractions (insoluble, IDF, and soluble, and SDF) and sugar composition of dietary fiber, functional properties (water retention capacity, WRC, swelling capacity, SWC, fat absorption capacity, FAC, glucose diffusion retardation index, GDRI, and osmotic pressure), total antioxidant activity (AA), and the content of antioxidant bioactive compounds (phenolic compounds and lycopene). To extract phenolic compounds and dietary fiber, three methods were assayed in this study: enzyme hydrolysis, maceration, and ultrasonic assistance. The content of TDF was 84.16%, and the major fraction was the IDF (71.82%), formed mainly by hemicelluloses. Tomato peel fiber retained 6.76 g of water/g as WRC, and it was significantly correlated with the IDF content. In addition, the content of IDF determined the low FAC and SWC and the GDRI at 60 min (39.22%). The main phenolic compound was rutin, followed by naringenin, rutin derivatives, and chlorogenic acid derivatives. These were better extracted using ultrasonic assistance, whereas lycopene showed mean values between 3 and 4 mg/100 g. The AA of tomato peel fiber was low, since the phenolic compounds are mainly bound to the cell wall of plant, showing a low capacity for scavenging radicals. Due to its chemical profile and functional properties, tomato peel fiber can be used as a food supplement, improving the different physical, chemical, and nutritional properties of foods. However the color and flavor of this product must be considered in its applications to avoid a negative effect on the sensory characteristic of the foods to which it is added. 相似文献
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利用高温高压、蒸煮、超声三种手段分别对小米水溶性膳食纤维进行物理改性,以探究不同物理改性对小米水溶性膳食纤维的理化性质及结构的影响。结果表明,改性后小米水溶性膳食纤维的化学基团无明显变化,表面出现裂痕,结构疏松多孔,有团聚现象,热稳定性上升,持水力、水膨胀力、持油力、结合脂肪能力均得到提高,其中经超声处理后四种能力提高最为显著(P<0.05),分别提高101.82%,36.67%,63.86%,33.08%;通过测定处理后的水溶性膳食纤维总抗氧化能力,发现经超声处理后的水溶性膳食纤维总抗氧化能力较强(P<0.05)。综上所述,三种物理改性手段均对小米水溶性膳食纤维的理化性质及结构特性具有一定影响,其中经超声处理后的小米水溶性膳食纤维理化性质改善较明显。 相似文献
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不同干燥方式对樱桃果粉品质的影响 总被引:1,自引:0,他引:1
LIU Yan-long ZHANG Cai-li LI Ting-ting CONG Ting-yu XU Lin-lin GONG Han-sheng 《食品研究与开发》2020,41(7):26-30
采用热风干燥、真空冷冻干燥、真空干燥3种干燥方式制备樱桃果粉,比较不同干燥方式对果粉水分含量、溶解性、流动性、色度、花色苷与多酚含量、抗氧化能力等理化品质的影响。结果表明:真空冷冻干燥的樱桃果粉水分含量(4.46%)最低,溶解性(52.36%)最好,色泽最接近樱桃的色泽,花色苷含量(5.85 mg/g)和多酚含量(2.13 mg/g)最高,抗氧化能力和清除自由基能力最好,但是流动性最差。热风干燥的樱桃果粉堆积密度(0.45 g/mL)最大,休止角(38.36°)最小,流动性最好。总之,干燥方式对樱桃果粉品质的影响较大,考虑樱桃果粉的理化品质,真空冷冻干燥更适合用于生产高品质樱桃果粉。 相似文献