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Articles by Asif Ahmad
Total Records ( 3 ) for Asif Ahmad
  Asif Ahmad , Faqir Muhammad Anjum , Tahir Zahoor and Haq Nawaz
  ß-glucan was extracted and purified from oat, at various temperature and pH levels. Response surface methodology was applied to optimize the temperature and pH for extraction of ß-glucan gum pellets. Higher temperatures and neutral pH appeared to increase the yield of gum pellet and recovery of ß-glucan in extracted gum pellets. An extraction temperature of 50°C with a pH 7 was proved effective in removal of more of the impurities from the gum pellet. All the treatments extracted higher amounts of SDF (74.11-76.85%) and TDF (86.71-91.03%) in the extracted gum pellets. However, soluble dietary fiber and total dietary fiber content of gum pellets declined with increase in pH of extrcation medium. Serum glucose, total cholesterol, triglycerides and LDL cholesterol of albino rats decline with administration of increased doses of gum pellet extracted at temperature of 50°C with a pH 7. Incorporation of this gum pellet at 5% level in feed of rats increase the HDL by 37.74% over control group of rats. The reduction in lipoprotein fraction was directly associated with presence of SDF and TDF in the gum pellets.
  Zia Ahmad Chatha , Asif Ahmad , Tahir Zahoor and Ali Raza
  Use of gamma irradiation and UV-C was compared over conventional used hot water treatment on mango pulp and peel. The storage study was also carried out to explore the potential of these techniques for the retention of total polyphenolic substances and antioxidants activity. Results indicated that polyphenolic substances decreased during storage. This decline in polyphenolic substances can be controlled by using gamma irradiation and UV-C treatment in mango peel and pulp. Lower doses (0.5 KGY) is more effective in controlling these losses. Comparing the varietal differences, white chaunsa showed better phenolic and antioxidant retention potential as compared to black chaunsa.
  Zia Ahmad Chatha , Asif Ahmad , Tahir Zahoo , Ali Raza and Muhammad Kaleem
  The comparative effect of gamma irradiation doses (0.5 kGy), UV-C-30 min and hot water 55°C-10 min on fungal load and aflatoxin production was evaluated on mango (black chaunsa). Thirteen fungal species were isolated from the surface of mango fruits (Mangifera Indica L.), among these the frequency of Aspergilus niger, Aspergillus flavus and Cladosporium cladosporoides was higher. Fungal load can be controlled best by using gamma rays at 0.5 KGy dose level followed by UV-C irradiation treatment while maximum load was found in control group. It appeared that non thermal techniques (gamma irradiation and UV-C) are comparatively better over control and conventionally used hot water treatment. Regarding the production of aflatoxins by these isolates, gamma irradiation treated samples showed less production of aflatoxin. Based on these results gamma irradiation and UV-C treatment possess the potential to replace conventionally used hot water treatment in mango.
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