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Archana SALIL Sehga ASHA Kawatra 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,53(2):93-98
This work was undertaken to evaluate the changes in polyphenol and phytic acid content in malted and blanched pearl millet grains. For malting, grains were steeped for 16 hours, germinated for 48 or 72 hours and then kilned at 50 °C for 24 hours. Blanching was done for 30 seconds in boiling water at 98 °C. Results indicated that blanching resulted in significant reduction in polyphenol (28%) and phytic acids (38%). Destruction of polyphenols (38 to 48%) and phytic acid (46 to 50%) was significantly higher in grains subjected to malting than blanching. The overall results suggested that malting with 72 hours of germination was most effective in reducing the antinutrient levels of pearl millet grains. 相似文献
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Some locally available fruits and vegetables of the arid zone of Rajasthanwere analyzed for their -carotene content; the selected fruits and vegetables were: Dansra (Rhus myserensis), Kachri (Cucumis collosus), fruit Kachri (Cucumis collosus), Kair (Capparisdecidua) and Sanghri (Prosopis cineriria). The -carotene contents of the samples were estimated in fresh and various processed states (blanched, dried and roasted). The results showed the heat lability of -carotene. Among the samples, kair was found to be the richest source of -carotene. Variety, too, had an impact on the content of this fat soluble vitamin. 相似文献
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Singh G. Kawatra Asha Sehgal S. 《Plant foods for human nutrition (Dordrecht, Netherlands)》2001,56(4):359-364
Six green leafy vegetables and herbs – spinach, amaranth, bengal gram, cauliflower, mint, coriander and carrots – were analyzed for moisture, protein,ascorbic acid, -carotene, total iron, ionizable iron (as % of total iron) in vitro iron (% of total iron), copper, manganese and zinc. Moisture content of the leaves and carrots varied from 75.1 percent (bengal gram) to 95.4 percent (carrot) and protein from 9.83 percent (carrots) to 30.9 (mint) percent. Ascorbic acid, -carotene, total iron and ionizable iron contents were at a maximum in case of bengal gram leaves whereas level of ionizable iron and in vitro iron as a percent of total iron was highest in carrots. Copper, manganese and zinc contents were maximum in spinach. 相似文献
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Shashi Kala Yadav Salil Sehgal 《Plant foods for human nutrition (Dordrecht, Netherlands)》1997,50(3):239-247
The present investigation was conducted to study the effect of selected processing and storage methods on the concentration
of ascorbic acid and β-carotene in Bathua and fenugreek, leaves. Methods included storage of leaves with or without polythene
bags for 24 and 48 h in a refrigerator at 5°C; at 30°C in polythene bags; drying (sun and oven); blanching (5, 10, 15 min);
open pan and pressure cooking. Ascorbic acid content of fresh leaves was 220.97 to 377.65 mg and β-carotene content was 19.00
to 24.64 mg/100 g, DW. The percent loss of ascorbic acid ranged from 2.03 to 8.77 and 45.15 to 66.9 while lower losses (0.0
to 1.75 and 1.63 to 2.84) of β-carotene were observed in leaves, stored in, the refrigerator and at 30°C, respectively. A
markedly greater reduction in ascorbic acid and β-carotene was observed in dried, blanched and cooked leaves. The study data
suggest that storage of leaves in refrigeration, drying in oven, blanching for a short time and cooking in a pressure cooker
results in better retention of these two vitamins. 相似文献
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以枸杞嫩茎叶为材料,研究了热风干燥条件下的较优加工工艺参数。结果表明:采用0.04%的Zn(CH3COO)2+0.02%的Na2SO3的混合液作为护绿剂效果好于锌铜护色;漂烫温度95-100℃、漂烫时间100 s有利于保持色泽和营养成分;用4%的蔗糖溶液浸泡30 min,可以明显改善制品的复水性。 相似文献
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预处理工艺参数对脱水甘蓝加工品质的影响 总被引:2,自引:0,他引:2
以甘蓝为原料,通过考察Vc含量、色泽变化,研究常压热风干燥下浸渍、漂烫、护绿等预处理工序中不同工艺参数对脱水甘蓝加工品质的影响。经单因素、正交实验研究,结果表明:所得脱水甘蓝品质最佳为:NaHCO3溶液浓度0.25mol/L,漂烫温度为90℃,漂烫时间45 s,护绿剂最佳配比为200mg/LZn(AC2)0∶.3%CaCl28∶00 mg/LMgCl21∶00mg/LEDTA=33∶2∶1∶,护色时间为30 min。 相似文献
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[目的]研究麦瓶草的护绿方法,为开发切实可行的麦瓶草产品提供科学依据和理论指导。[方法]以麦瓶草为材料, 采用碱性溶液热烫法和金属离子置换法处理,并测定处理后麦瓶草的外观色泽等级与叶绿素含量。[结果]结果表明: 碱性溶液热烫法护绿效果较差,各因素影响的显著性顺序为热汤温度〉热烫时间〉pH,其中热烫温度为极显著,热烫时间为显著,最佳组合为92 ℃、4.5 min、 pH值 7.5;金属离子置换法护绿效果好,各因素影响的显著性顺序为Zn^2+〉Cu^2+〉Mg^2+,其中Zn^2+和Cu^2+的影响为极显著,最佳组合为Zn^2+200 mg/L、Cu^2+100 mg/L、Mg^2+200 mg/L。[结论]从处理后麦瓶草的外观与叶绿素含量角度来看,金属离子置换法明显优于碱液热烫法。 相似文献