## 1 Introduction  
Probiotics are microorganisms that have health benefits for the host when they are administrated in a sufficient amount [1]. They have numerous beneficial characteristics, e.g., control of irritable bowel syndrome, endogenous or exogenous pathogens suppression, lactose tolerance improvement, colon cancer risk reduction, body weight regulation, constipation improvement, tooth decay prevention, etc. [2, 3]. _Lactobacillus plantarum_ is a lactic acid bacterium, which consists of various species and is recognized as a potential probioticotic bacteria [4]. However, it is challenging for probiotics to survive through the process, not to mention exert their probioticotic effect on the host owing to the harsh environments during the manufacturing, storage, and digestion process, e.g., oxygen, heat, low pH, high bile salt content, etc. [5, 6, 7, 8]. Microencapsulation is a talented technology that can protect the probiotics by coating them with wall materials to maintain their viability and functionality during the manufacturing, storage, and digestion process and let them apply their probiotic effect in the gut with an adequate dose level [9; 10; 11; 12; 13; 14; 15; 16; 17]. Generally, spray-drying and lyophilization (or freeze-drying) are the mainly applied technology, accomplished with other methods, e.g., spray-chilling [17], emulsion [18], extrusion, etc. However, due to the high temperature of the heating process [9; 19] through the chamber of spray-drying and the extreme sensitivity of the probiotics to heat, it is not suitable to use that technology on probiotics. As a substrate, lyophilization [20; 21; 22] is a process that can sublimate the water content in the iced samples to the gaseous state under vacuum conditions to efficiently dehydrate the samples, while having the advantage of minimal heat stress to the probiotic. No doubt that coating materials play an important role in the microencapsulation technology [12]. Wiley proteins (WP) the by-product in dairy industry are sources of valuable biological proteins as well as rich in riboflavin and minerals [4]. The main drawback of WP is environmental issue because of high BOD values. WP are considered an exceptional coating material due to their specific physical and chemical properties, such as excellent emulsification, superb gelation and exquisite fill-forming properties. Denatured whey proteins (DWP) are originated from WP by treatment with acid or heat, which can contribute to some specific properties including high tensile property and low oxygen permeability [7; 9; 18; 23]. Based on the concept of development of new value-added applications of dairy wastes to enlarge the application area and avoid discarding the whey protein, it is appropriate to adopt the practice of using whey proteins as coating materials for the microencapsulation process [24]. Furthermore, those people who improved their health awareness are not fulfilled with the existing probiotic dairy matrices foods anymore. Instead, considerable enthusiasm of consumers prevails in probiotic plant matrix foods with multiple potential health benefits [13; 25]. Wherein, fruits are considered nutritious, health-improving, as well as disease-avoiding foods, owing to their nutritional and functional properties [26]. Although these foods are seasonal-specific, it is still possible to make them accessible in plentiful forms for the convenience of consumers all around the year by applying advanced food science technology [27]. Among those fruit products, fruit juice is one of the most favored forms of consumption by consumers [5; 28; 29]. However, there is a reduction of nutritional value, e.g., bioactive compounds, during the processing of fruit juice. In addition, these juices also contain sufficient sugars, including glucose, fructose, and sucrose [26], which may lead to the over intake of carbohydrates.