Micro-printing performance of durable water-repellent black polyester-spandex fabrics without fluorine and silicone resins北大核心CSCD

Synthetic fibers are widely used because of their stable chemical properties high mechanical strength and low cost. Among them polyester has the largest production and is the most widely used and China is also the country with the largest polyester production in the world. With the technological progress of energy saving and emission reduction of liquid disperse dyes the technology of micro printing of polyester and polyester / spandex fabrics has been realized. Based on the high market share of black polyester / spandex printed fabrics and the increasing market demand for functional finishing (e. g. anti-static finishing water repellent finishing UV resistance finishing etc.), it is of great significance to study the process of one-step short processing of polyester printing and functional finishing using carbon-based materials (e. g. carbon black). Carbon black is a gray-black organic pigment with good antistatic and anti-UV properties. It is an eco-friendly advanced material that integrates printing dyeing and functional finishing. To make up for the lack of color depth of carbon black pigment a disperse black dye and carbon black pigment in the same bath preparation scheme are chosen to prepare a functional liquid carbon black @ disperse black dye (CB-D). Not only does CB-D meet the requirements of deep black printing but also it can simultaneously provide water-repellent finishing to the fabric. In this way the application of organic fluorine or organic silicon resin can be dispensed with. A functional liquid CB-D was prepared by pre-dispersion and zirconium oxide grinding method under the action of abrasive agent AL50 (anionic / non-ionic surfactant complex) . The effects of CB-D mass fraction binder type binder D101 mass fraction baking temperature and time on color (L∗ value) rubbing and soaping colorfastness were investigated by optimizing the printing process of liquid CB-D. At the same time the fixation mechanism of CB-D was investigated and the properties of polyester-spandex printed fabrics were tested. The stability of CB-D and the colorfastness of polyester-spandex printed fabrics to hot-wash effluent were investigated by the rate of change of absorbance. The effect of hot-washing on dye floating in the printed area and dye staining in the non-printed area was characterized by the brightness of the printed area L∗ value and the whiteness of the non-printed area (CIE whiteness W10). The properties of CB-D were characterized by scanning electron microscopy and transmission electron microscopy and the antistatic property water repellency air permeability moisture permeability and tensile breaking strength of the fabrics were tested. (i) The first functional liquid CB-D with excellent stability is prepared by grinding carbon black and disperse black dye composed of orange 288 purple 93 and blue 291:3 in the same bath. (ii) A durable fluorine-free and silicone-free water repellent black polyester spandex fabric is prepared reducing the cost of functional finishing and environmental pollution. The preparation of durable water-repellent polyester spandex fabrics without a functional finishing agent is a new technology. CB-D as functional organic melanin with excellent performance and simple processing is a new low-carbon and eco-friendly material and ecological printing and dyeing process. (i) As for the black polyester spandex fabric prepared by a micro-printing process the color fastness of deep black color is not less than grade 4 the white ground is not stained and the color of wastewater is very low. The printing process requires 5% functional CB-D and 8. 5% binder D101. (ii) The black polyester spandex fabric has excellent and durable water repellency air permeability moisture permeability and antistatic property. The water contact angle is 132° anti-static grade is A and the air permeability and moisture permeability are more than 260 mm / s and 2 880 g / (m2h) respectively. After 30 times of home washing it almost keeps the original excellent performance. (iii) The CB-D prepared based on carbon black and disperse black dye is a colloidal aggregate that easily forms continuous carbon black aggregates on the fiber surface showing more excellent porosity film formation and water repellency while maintaining air permeability and moisture permeability. Carbon black is a low-cost material and the liquid CB-D prepared by modifying carbon black with disperse black dye has a new use in preparing functional textiles with good application prospects. © 2022 Authors. All rights reserved.     

8.Standards for Grade(2)

The original set of the physical standards currently in effect is sealed and depositedin a vault at the USDA in Memphis or Washington,D.C.Copies of these,known as pra-ctical forms,are prepared and sold by USDA.In addition,guide boxes containing sixsamples are prepared and sold.The utmost care is taken to keep the range of color,leaf,and preparation in all copies of each standard,as nearly the same as possible.The color of cotton deepens with age—more in the high grades than in the low gradesand more in Tinged and Spotted grades than in the Gray grades.The color of the cottonin the standards stored or used under different conditions may differ considerably as time     

Study on the fastness to perspiration of red dyes on cashmere北大核心

Cashmere dyed with Lanasol red reactive dyes has the advantages of bright color, good levelness etc. Due to differences in dye their own performance, the fastness of the Lanasol red dyes to perspiration is not high. Aimed at this problem, Jacobian solid color fastness and color fastness promoting agent are used in improving the fastness to perspiration, by adjusting the pH value, the holding time. The dyeing of cashmere Lanasol red B treatment stage optimal process parameters value after heat treatment temperature is 40 °C, pH value 5, yake solid dosage is 3% (owf). For dyeing of cashmere Lanasol red 5 B processing stage optimal process parameters value after heat treatment temperature is 40 °C, pH value 5, yake solid dosage is 2% (owf).     

Study on the structure and properties of modified silk with ultraviolet absorbent北大核心CSCD

The silk fiber has an irreplaceable position in textile fibers and related silk fabrics have the advantages of light and airy texture good moisture absorption and breathability comfort in wear etc. It is also widely used in other fields such as the biomedical sector. However silk also has its own limitations poor light resistance and susceptibility to ultraviolet light especially the ultraviolet light of 290-400 nm wavelength in daylight such as under which condition it is prone to yellowing and photodegradation. The yellowing of silk is due to the photo-oxidation of tyrosine and tryptophan in silk protein under the action of ultraviolet light from sunlight and due to the production of yellow substances which affects the whiteness of silk. In addition from the molecular structure of silk most of the amino acids susceptible to UV light are distributed in the amorphous region. As the amorphous region is affected the structure of the crystalline region is also gradually relaxed the local degradation begins and the silk protein macromolecule chain is cleaved which leads to the decrease of the mechanical properties of silk fibers and accelerates the aging of silk fibers and fabrics. Therefore it is necessary to modify the silk products outside the anti-purple line. The current methods used to modify silk are mostly for post finishing modification including coating impregnation and chemical grafting methods but these methods often affect the original color or feel of the fabric and the durability of the modified effect is also poor. The feeding method is a green method to obtain modified silk by spraying mulberry leaves or artificial feed mixed with modifier which is ingested by silkworm and transferred to silk gland. In this study five aminobenzene UV absorbers were used as exogenous additive food for silkworms. The effect of molecular polarity on the transport of modifiers to silk glands was investigated and their effects on silkworm development and silk structural properties were studied. It was found that the aminobenzene UV absorbers were more easily transferred to the central silk gland silk glue and less to the posterior silk gland (fibroin). 4-dimethylaminobenzoic acid was found to be the highest in the posterior silk gland with a content of 3. 27 μg / strip. The cocoon width and cocoon quality of this group were significantly lower than those of the control group and the silk gum content was increased when this group was used as the study object. Compared with the control group the relative content of β-folded structure and crystallinity of the silk in the addition feeding group decreased slightly. The silkworm silk in the feeding group showed a certain UV absorption ability. After 330 h UV irradiation the breaking strength and elongation of the control group decreased by 48. 95% and 43. 52% respectively while those of the feeding group decreased by 42. 03% and 34. 18% respectively. In this paper UV absorbers were added to silkworms to obtain modified silk mainly focusing on the transfer of the modifier to the silk gland and the structural properties of the modified silk only for the most UV absorbers to enter the silk gland of the posterior group of silk. Other properties of the modified silk such as washing resistance have not been studied and some more in-depth studies are required. For instance it needs to be studied in depth for the limited absorption of exogenous additives by silkworms additive food's being not always absorbed by silkworms and transferred to the silk gland and the mechanism of action between the additive food and silk protein after the former's entering the silk gland. © 2022 Authors. All rights reserved.     

Selection and Study of High-yield Aerobic Strains of Treating the Closed Circulation Wastewater for Regenerated Fiber

Efficient and reliable removal of cellulose,hemicellulose and lignin,that are the major organic pollutants in the wastewater from regenerated fiber,is critically important to prevent toxicity discharge.Low-and high-pH stresses sometimes occur in the effluent treatment systems due to the use of a large amount of acid and alkaline in the pulping process.Using flat separation method to select high-yield strains from bio-contact oxidation basin,seeing configuration of the strains and doing some physiological experiments,we found that the strains contain two kinds of main bacteria,Zoogloea sp.and Pseudomona sp.We also discovered the best growing time by spectrophotometer.The best growing time is at 0～32h,the logarithmic phase is about at 12～32h,and the stable growth phase is about 32～60h.Furthermore,we concluded that the disposal ability of high-yield strain is better than the ordinary one by doing parallel experiment.Through orthogonal test we also confirmed that the best growing temperature and pH value are 29℃and 7.3 respectively.The COD removal rate is about 93% when the biomembrane is in good condition.     

Conservation of Leaves of a Medicinal Plant of Western Algeria （Pistacia atlantica）

In our context, and in the goal to valorize the Pistacia atlantica species Desfthat grows spontaneously in Algeria occidental except the coastline, and that is used by the nomadic populations in their daily consumptions, we are thinking about drying its leaves. Here, the biochemical analysis of dried leaves ofPistacia atlantica is determined, the sorption is other ms are of great importance in the food industry, especially in the drying; the sorption isotherms of pistachio leaves were measured by the gravimetric method at three temperatures 40, 50 and 60 ℃. The equilibrium was achieved after eight days for desorption and seven days for adsorption with water activity ranging from 5% to 90%. Only the GAB and Peleg models were found to be the most suitable for describing the sorption curves. The isosteric heat of sorption of Pistacia atlantica leaves decreases with an increase in moisture content and was found to be an exponential function of moisture content for adsorption and desorption. The pistachio leaves could be considered as a rich natural source of valuable nutriments （carbohydrates, proteins and lipids）; lipid fraction is equal to 2.25%; proteins are the second macronutriment that predominates in these sheets： 4.35%; accordingly carbohydrates content was about 25.77%.     

The 900 High Volume Fiber Test System (4)

Colorimeter For over two hundred years color has been considered an important property in cotton evaluation because it influences the value and price of fiber. This colorimeter provides fast,accurate, and objective measurements of cotton color to mills for purchasing raw cotton and for monitoring incoming shipments. The Colorimeter 930 is the lastest in a line of Spin-lab colorimeters that have been used extensively by the United States Department of Agriculture (USDA) for preparation of grade standards which are subsequently distributed to merchants, shippers, and mills all over the world.     

MAGNETIC COUPLING BETWEEN TWO-DIMENSIONAL ELECTRON GAS AND A TYPE- Ⅱ SUPERCONDUCTOR

The magnetic coupling between a superconducting film and a 2DEG is discussed by generalizing the theory of Meincke and that of Rammer and Shelankov,correctly taking into account the Hall effect in 2DEG. The induced voltages both parallel to and perpendicular to the applied current are discussed in the magnetic field regime in which the magnetoresistance is dominated by the SdH oscillations. The results obtained are in good agreement with the experiment of Kruithof et. al..     

中英文颜色术语的理解歧义

Interpretation of some color terms is a kind of cross-cultural activity. The color terms in English and Chinese differ greatly in meanings due to physical and cultural reasons. The same color to people in different cultures leads to different associative meanings that share various cultural implications. It is indispensable to study color terms in terms of colors and society, colors and history, colors and politics, and colors and the economy on the basis of comparison and contrast, which constitute the essential elements of any culture and society.     

Study of the Stability of Beef Tallow at High Temperatures and Comparison with Other Fatty Materials

Beef tallow is a byproduct of the slaughter industry. As a consequence, meat producer countries obtain a high amount of this low value-added fatty material. In Uruguay, it is generally used for food purposes or for biodiesel production. Globally, around half of the beef tallow produced worldwide is used for the manufacturing of food. To the best of our knowledge there are no published studies concerning the stability of beef tallow when exposed to high temperatures. The aim of this work was to study some Uruguayan beef tallow brands and compare its stability with that of the most frequently used frying oils in Uruguay （sunflower high oleic, rice bran and sunflower oil） to assess its suitability for frying. Stability was assessed by the oxidative stability index and thermoxidation in absence of food. Even though beef tallow＇s inherent stability indicated that it should be highly stable to oxidation, the majority of the analyzed samples exhibited a similar or lower stability than sunflower high oleic. This might be explained by a different composition in pro-oxidants and/or antioxidants between the beef tallows and the oils. According to the thermoxidation assays, which are carried out in similar conditions to those of a frying process, three of the beef tallow samples, sunflower high oleic and rice bran oil would be similarly suitable for frying, while sunflower oil and the other two samples of beef tallow evidenced a lower thermoxidative stability, thus not being recommended for this use.     

Analysis of purple red color on the traditional Daur embroidered pouch北大核心CSCD

Twenty five pieces of embroidered pouches collected from Molidawa Daur National Museum in Inner Mongolia were analyzed. Among them, eight embroidered pouches which might be dyed with vegetable dyes were chosen. Sixteen purplish red colors were selected for the recovery experiment. The range of L∗, a∗, b∗ and c∗ value of colors were obtained through positioning and comparative study. The feasible dyes were confirmed to be sappanwood and safflower. The dyeing process was as follows: direct dyeing with sappanwood, pre, mordant dyeing, and post, mordant dyeing. The results showed that a variety of purple, red colors were obtained by adjusting the dye concentration, the mordant types and the pH value. One color could be recovered by direct dyeing with sappanwood, while eight colors could be recovered by pre, mordant dyeing. Seven colors could be recovered by safflower dyeing. The color difference to the collected colors was less than four which reached the purpose of recovery research. © 2018 China Silk Association. All rights reserved.     

Analysis on the shape and structure of Mongolian traditional Gu Gu crowns in the illustrations of the Jāmi' al-Tawārīkh in the National Library of France北大核心CSCD

Jāmi' al-Tawārīkh is a detailed history book of Mongolia compiled by the prime minister Rashid al-Din under an order issued by Ghazan Khan in 700 of the Islamic calendar (1310 - 1311 A. D.). After the book was finished the royal family invested a great deal of manpower material and financial resources to draw its illustrated edition which was completed between 1306 A. D. and 1314 A. D. In this period Persian miniatures had strong Mongolian characteristics. The facial shapes of the characters showed the image characteristics of Mongolians and the clothing styles and patterns on the clothes also had the characteristics of Mongolian and even traditional Chinese costumes. Among them Jāmi' al-Tawārīkh in the National Library of France was drawn between 1425 A. D. and 1430 A. D. There are 15 Persian miniatures in the book that illustrate the Gu Gu crowns worn by aristocratic women of Mongolia which were the headgear favored by women of the ethnic group at that time and were very popular. The Gu Gu crowns in the illustrations are rich in color and clear in structure which provide precious and detailed historical image data for us to study the shape and manufacture characteristics of Gu Gu crowns in the Mongolian and Yuan Dynasties. Through reading the pictures we can learn the color pattern shape structure collocation wearing effect and identity of the wearers wearing occasions and other practical problems of the Gu Gu crowns. Combined with the ancient documents and images we can further study and analyze the specific shape and system of the Gu Gu crowns in the Mongol Yuan period the characteristics of wearing and the related cultural connotation behind them. Firstly the 15 illustrated wearing scenes were classified and the wearing characteristics of Gu Gu crowns in different scenes were summarized to find out their regularity. Secondly the characteristics of wearing the Gu Gu crowns in different scenes were compared and the different meanings they represent were analyzed and studied. Finally we concluded the shape characteristics and decorative effect of Gu Gu crowns in the Mongol Yuan period and summarized the cultural implication and national belief represented by Gu Gu crowns as well as the fundamental reason why they were favored by Mongolian women for their enduring popularity. On this basis the correspondence analysis method was used to study the relationship between the formative characteristics occasion of wearing cultural connotation and the identity status and belief of the users. We concluded that the characteristics of the Gu Gu crowns in the illustrations of Jāmi' al-Tawārīkh collected in the National Library of France except for only wearing the hood and crown cape in keeping vigil beside the coffin changed little with the wearing occasions. The shape of the bionic swan showed totem worship the structure features of the square above and the circle below explained the significance of the combination of men and women. It reflects that Mongolians believe in the "Mongke Tengri" Eternal Heaven and the modeling concept based on nature is beyond nature. The structure of being square at the top and circular at the bottom explains the significance of the combination of men and women. The length of crown feathers the number of the ball feathers the hood color and the cape length change showed that the usefulness of Gu Gu crowns was replaced by decoration becoming a symbol of status. In the middle and late period the gold cross pattern appeared frequently in the crown decoration highlighting the identity of many noble women as disciples of Nestorianism. As a whole Gu Gu crowns elongated the human body lines in a towering and beautiful shape making people appear tall and in line with aesthetic characteristics. The luxurious decorative details highlighted the rich and leisure life of aristocratic women and their noble social rank and status in the Yuan Dynasty. The original symbolism took a back seat to the decorative function. This edition of Jāmi ' al-Tawārīkh provides precious image information for the study of the shape and symbolic significance of aristocratic women's headgear in the Mongol (Yuan) period. Through systematic studying and sorting out the structure shape material pattern production technology etc. it can better inherit Chinese traditional costume culture and inherit the traditional costume skills of China. The research results can provide inspiration and innovative ideas for the design and innovation of Chinese national costumes. Under the trend of global integration the exchange of clothing culture among different countries is increasingly close. It is a shortcut for Chinese fashion to go to the world to retain and integrate the characteristics of national clothing. © 2022 Authors. All rights reserved.     

Preliminary Studies on Composition,Quality and Oxidative Stability of Commercial Avocado Oil Produced in Chile

Avocado oil is a relatively new oil in the market and is highly appreciated by the consumers because of its fine aroma, pleasant taste and health benefits. A study on the characterization of commercial avocado oils produced in Chile was conducted in order to discuss their quality parameters. The study was applied to two marketed avocado oils. The main analytical parameters evaluated to the oils were： fatty acid composition, total chlorophylls, total carotenoids, tocopherols, acid value, peroxide value, total phenolic compounds, polar compounds, oil stability, UV absorption and 3.5-stigmastadiene content. The fatty acid compositions of the studied oils were according with oil composition of pulp pure of avocado fruit. The analysis of tocopherols by high performance liquid chromatography （HPLC） revealed significant differences between the avocado oils studied. Total phenolic compounds, oil stability, UV Absorption characteristics, peroxide value, acid value, tocopherols content, total chlorophylls, total carotenoids and polar compounds were also significantly different between the commercial studied oils. All the above results show a different quality between both commercial avocado oils, showing that the sample C has worse values for the parameters of quality as those required by legislation in many countries. Also, 3.5-stigmastadiene content shows high concentration for one of the commercial avocado oil evaluated which demonstrates the presence of refined oil or that the oil has been submitted to high temperatures. On the other hand it is remarkable that despite the fact that there are many differences in quality parameters, both oils are labeled and marketed as extra virgin quality oils, demonstrating the need to regulate the classification of appreciated oils by the consumers.     

肉类色泽变化机理研究进展(英文)

Meat color is a complex topic involving animal genetics, including meat itself and external factors (the animal genetic, ante- and post-mortem conditions, fundamental muscle chemistry, and many factors related to meat processing, package distribution, storage, display and final preparation for consumption and so on). Meat color chemistry, meat color transformation mechanism and the main methods of color evaluation were described in this article, the key factors of chemistry and biological effect in meat color stability were summarized. International investigators disputed relativity index and factors of meat color, but recognized the content of myoglobin was the foundation of meat color stability.     

13.Mieronaire Reading

Measuring fineness and naturity of fibers.——Micronaire(mike)readings,as deter-mined by airflow instruments,are measures of the fineness of individual fibers and areused widly in merchandising and manufacturing cotton.This measurement also indicatesfiber maturity.Mike readings are the most widely used instrument measurements in dome-stic and international trade today.This measurement is useful to mills in their qualitycontrol program to assure a uniform and even-running mix.It is a reproducible test whi-     

Research progress on chemical modification of silk fibroin and its applications北大核心CSCD

Mulberry silk is composed of the two major parts of two triangle-like silk fibroin fibers and sericin covering the fibers and a few lipids. After removing the sericin on the raw silk what is left is the silk fibroin fiber. Silk fibroin is the main part of silk accounting for about 75% of the total weight. Silk fibroin contains 18 natural amino acids such as glycine Gly alanine Ala serine Ser serine aspartic acid Asp and tyrosine Tyr . The secondary structure of silk fibroin has three main conformations α-helix β-fold and random coil. Under certain conditions the three conformations can transform into each other and change the mechanical properties of the silk fibroin material. Silk fibroin extracted from silk fiber is a natural polymer with biocompatibility and biodegradability. It can be further processed into different forms of materials nanoparticles films hydrogels sponges etc. It has been applied in many fields such as biomedicine and cosmetics. In order to meet the needs of different fields researchers have conducted further chemical modification treatment based on the original excellent properties of silk fibroin. Meanwhile the active groups on various amino acid residues in silk fibroin also provide chemical reaction sites for the chemical modification of silk fibroin. The chemical modification methods of silk fibroin mainly include amino acid residue modification macromolecular grafting modification and crosslinking reaction modification. Among them amino acid residue modification can modify protein amino acid residues by chemical reagents and some groups can be introduced into the side chains of silk fibroin macromolecules. Grafting modification of silk fibroin macromolecules is one of the main means to bind functional compounds to silk fibroin macromolecular chains. The properties of grafted silk fibroin are affected by the type and grafting rate of the grafts. The chemical crosslinking reaction modification of silk fibroin macromolecules is to make the macromolecular chains connected by covalent bonds and form a network structure by means of crosslinking agents enzymes or ultraviolet irradiation. The cross-linking reaction can not only form covalent bonds within and between the molecular chains of silk fibroin thus changing its structural properties and improving its stability but be used to form covalent bonds with other polymers. At present the chemical modification of silk fibroin is mainly applied in the fields of silk textiles biomedicine and environmental science. In the field of silk textiles graft copolymerization modification of vinyl and other monomers crosslinking agent modification and other methods are used to overcome the shortcomings of silk like being easy to wrinkle. The graft modified monomers mainly include ethylene methacrylate and methylacrylamide. The active groups on crosslinking agents such as polycarboxylic acid / anhydride and epoxide are covalently combined with carboxyl hydroxyl and amino groups on macromolecules of silk fibroin to improve the wrinkle resistance of silk fabrics. In the field of biomedicine silk fibroin materials with appropriate chemical modification have better biological activity drug delivery ability antimicrobial properties and mechanical properties. The optimization of these properties enables silk fibroin materials to show great potential in drug control delivery tissue regeneration and wound repair. The applied research in the field of environmental science mainly focuses on the adsorption separation and catalysis of impurities in water. Therefore the modification of amino acid residues grafting and cross-linking of protein macromolecules can change some important properties of silk fibroin and meet the requirements of various applications and functionalization of silk fibroin. In many fields of chemical modification and application of silk fibroin protein fruitful results have been achieved which has laid a good foundation for the further development of related fields and also shows that the chemical modification of silk fibroin material has great potential and application prospects. However there are still some problems that need to be overcome and further improved in the current chemical modification methods such as mild modification conditions and accurate adjustment of the degree of modification which will be the research direction of related fields in the future. © 2022 Authors. All rights reserved.     

Kinetics for Describing the Creaming of Protein-Stabilized O/W Emulsions by Multiple Light Scattering

In the present work, new kinetics to describe the creaming stability of oil-in-water emulsions determined by backscattering measurements （BS） is proposed. The emulsions assayed exhibited a different backscattering profiles regarding creaming destabilization hyperbolic and sigmoid one. Hyperbolic behavior can be described by a second order kinetics, where k_h could be equaled to a rate constant that describes the creaming process and its values would indicate the stability of emulsions. While for the sigmoid BS pattern, kinetics with two terms, is adequate to describe the creaming process in contrast to kinetics previously reported in the literature. The kh value has the same meaning as before, and ks indicates the delaying effect on the creaming rate.     

浅谈科技论文英文摘要的编写要求

To find out the colouring mechanism and the form of water molecule of ouilin hydrothermally-grown sguthetic emerald, the test of electronic probe and the test of the spectrum etc are adopted in the research. The result shows that Guilin hydrothermally-grown synthetic emerald is characterhed by low content of alkali and Fe but some are out of Cl; both Ⅰ -troe and,Ⅱ -type water exist. Its colour should be attributed to the separation of F-spectrum term and spectrum term of electrons jumping between the different emerge levels. Moreover, nail-like inclusions of three facies and microwave patterns often exist, which can be regarded as identified f6atures of this kind of emeralds, and FTIR can be applied to identibog all kinds of emeralds.     

食品中蛋白质的工能特性(英文)

The structure, shape, color, smell and taste of food were decided by protein functionality.The utilization of protein will improve by changing the protein functionality.Protein functionality is also advantage to maintain and utilize the nutrition of food.This paper summarized the nature, classification, factors and prospect of protein functionality.It ccn provide a theoretical basis for application of protein in food industry.