The Significance of Centrifuges in Wheat Grain Quality Analysis

　　In biological research, regardless of the size of the object, every item is worth analyzing—from a single grain of wheat to quality assessments, resource surveys, and secondary metabolites (such as alkaloids and hormones)—none should be overlooked.

　　This process requires biochemical technology, and biochemical technology, in turn, requires centrifuges.

　　Food is paramount for the people; hence, food security has always been a critically important issue in China—and one that draws global attention. Whether measured by cultivated acreage or yield, wheat ranks as the world’s second-largest crop. Foods made from wheat—such as bread, cookies, macaroni, steamed buns, and dumplings—are widely loved and serve as staple foods for people in many countries. The quality of wheat grains significantly affects the quality of baked goods like bread and cookies, and it also influences the processing techniques used by food manufacturers to convert wheat flour into various products. Moreover, the protein content of regional wheat grains serves as an important indicator of the nutritional status of local populations. As a result, the quality of wheat grains has increasingly attracted the attention of agronomists, plant breeders, and food-processing enterprises alike.

　　Determination of the wet gluten content in common flours:

　　1. Prepare the dough: For each wheat variety, thoroughly mix the flour samples, then weigh out 10.0 g twice and place them into clean enamel cups. Using a pipette, add 5 ml of distilled water to each cup. First, stir the mixture with a glass rod, scraping off any flour particles adhering to the container and the glass rod and incorporating them into the dough. Then, knead the dough by hand until it becomes uniformly consistent. Place the spherical dough balls back into the enamel cups and let them rest for 20 minutes to allow the moisture to permeate evenly throughout.

　　2. To extract the gluten, add an appropriate amount of clean water at 15–20°C or 2% saltwater to an enamel basin. Then, knead the dough by hand in the water to wash away the starch, bran, and water-soluble substances. During the process, change the water 3–4 times. Each time you change the water, use a mesh strainer to filter it, and collect any gluten fragments remaining on the strainer back into the dough. Continue washing until the gluten no longer causes turbidity in the clear water. For greater accuracy, you can use an I-KI solution test: Place the washing water or the water squeezed from the gluten onto a petri dish, then add 1–2 drops of iodine solution. The washing is complete when there is no blue color reaction.

　　3. To weigh the wet gluten, gently squeeze the washed gluten dough by hand to remove excess water until the dough starts to feel slightly sticky. At this point, the gluten is referred to as “wet gluten.” (If available, use a centrifuge to drain the water; set the centrifuge speed at 3,000 rpm and centrifuge for 3 minutes.) Shape the wet gluten into a spherical form and place it onto the lid of a pre-weighed aluminum container, then weigh it accurately to 0.01 g. The wet gluten content should be corrected as a percentage of the sample weight, based on a moisture content of 14%. The difference between two samples must not exceed 2%.

　　Wet gluten content (%) = Wet gluten weight (g) / Sample weight (g) × 100

　　Corrected wet gluten content (%) (14% moisture) = Unadjusted wet gluten content × (100 - 14) / (100 - sample’s moisture content) × 100

　　 Centrifuge This very approach enhances the efficiency of real-time monitoring and grasping information on wheat grain quality. By analyzing data through a series of biochemical techniques, it can guide purchasing decisions by production enterprises, shorten testing and laboratory analysis times, reduce costs, and improve overall efficiency. Furthermore, by feeding back wheat quality information to breeders, production managers, and farmers, we can accumulate valuable insights and knowledge about the mechanisms underlying wheat quality formation, thereby providing guidance for wheat breeding and production management.