Showing 2 results for Artichoke
S Abbasi, H Farzanmehr,
Volume 13, Issue 47 (4-2009)
Abstract
Nowadays, Inulin, due to its nutritional properties, is widely being used all over the world. Artichoke tuber is one of its major industrial extraction sources. Therefore, in the present study we initially aimed to determine total carbohydrate, inulin, reducing sugars as well as dry matter contents of an Iranian artichoke. Thereafter, we focused on the optimization of aqueous extraction of inulin in the presence and absence of direct and indirect ultrasonic waves at various combinations of extraction time, temperature and solvent:solid ratio using Box-Behnken design and response surface methodology (RSM). Based on the experiments, the dry matter and total carbohydrate contents of Iranian artichoke were 6.7 and 3.9%, respectively. We also found that an empirical model developed by RSM could satisfactorily describe relationship between independent parameters and the yield of total carbohydrate as well as inulin. Furthermore, our findings revealed that optimal aqueous extraction of inulin could be achieved at 80ºC, for a duration of 5 min at a solvent:solid ratio of 1:5. Moreover, a direct relation was seen between the yield of extraction and the power as well as frequency of ultrasonic waves where with increasing latter variables, duration of extraction process and inulin yield considerably reduced and increased, respectively.
H Fazaeli, M Nosrat Abadi, K Karkodi, A Mirhadi,
Volume 13, Issue 48 (7-2009)
Abstract
This research was conducted to study the nutritive value of Jerusalem artichoke (JA) as animal feed. The aerial part of the JA plant was harvested, at full bloom stage, and then chopped and dried. The chopped JA hay included 0.0, 10, 20, 30 and 40 % of alfalfa hay, used as experimental diets, and tested for in vitro digestibility. In a changeover experiment with Latin square based design the in vivo digestibility was studied by sheep. The samples of dried JA forage as well as the experimental diets were collected and analyzed chemically. The nutrient contents of JA were relatively similar to alfalfa hay except for the crude protein that was lower in JA. The in vitro dry mater and organic mater digestibility were not affected by the levels of JA in the diets, but the digestible value reduced (p<0.05) when the JA ratio was increased to the 40% of the diet. The in vivo digestibility of dry mater, organic mater and fiber fractions was decreased in the diet containing 40 percent JA however, total digestible nutrients and metabolisable energy were not significantly different among the treatments. It may be concluded that nutritive value of JA is similar to alfalfa hay, when it is used up to 30% instead of the alfalfa hay based diet
