Standard Procedure AOCS Cd 12c-16: Accelerated Oxidation Test for Determining the Oxidative Stability of Foods, Oils and Fats Using OXITEST Oxidation Tester     Lipid oxidation is the main factor limiting the shelf life of fat- and oil-containing foods. Various methods are available to assess the rate of lipid oxidation in foods. However, these techniques require extracting fat from food samples prior to oxidation testing. In contrast, the Oxitest instrument (Model: ST149B Oil Oxidation Tester; Origin: China; Manufacturer: Shandong Shengtai Instrument Co., Ltd.) can analyze fat oxidation in whole food samples, providing a simpler and faster method.   1. Basic Principles and Characteristics of the Instrument     OXITEST adopts the official AOCS method Cd12c-16, accelerating the oxidation process through two factors: temperature and pressure, enabling experimental data to be obtained within hours. The instrument places the sample in a high-oxidation environment, measures the pressure change in the oxidation reaction chamber of Shengtai Instrument, monitors the oxygen consumption of reactive components in the sample, and automatically generates the Induction Period (IP) value. The longer the IP value, the better the antioxidant stability of the product.     The OXITEST software supports multiple applications:   - Repeatability testing: A series of tests performed on the same sample or standard to verify its IP period and calculate the accuracy and repeatability of data. - Freshness testing: Verify the quality of different batches (e.g., the same raw material) and make comparisons. - Formula comparison: Identify a stable formula for finished products under the same conditions. - Packaging comparison: Test which packaging can keep the product fresh. - IP during aging: Obtain a downward curve of IP of the product during its shelf life. - Shelf life estimation: Predict the oxidative stability during the shelf life.   Compared with traditional methods, it saves analysis time and is specially designed for R&D, product development and quality control laboratories. Shandong Shengtai Instrument Co., Ltd. provides you with excellent analytical solutions for the oxidative stability and antioxidant capacity of foods, oils and fats.

Test Method for Aniline Point of Engine Oil Engine oil, also known as engine lubricating oil, is a binary lubricant composed of base oil and additives, with a chemical formula of mixture. Its density is approximately 0.91×10³ kg/m³. Under normal temperature and pressure conditions, it is a clear amber or dark brown liquid, featuring low-temperature operability, excellent viscosity-temperature properties, oxidation resistance and foam resistance. It is commonly used in the maintenance of various types of engines, playing the roles of lubrication and anti-wear, auxiliary cooling and temperature reduction, sealing and leak prevention, rust and corrosion prevention, as well as shock absorption and buffering. Purpose of the Experiment： In the fields of chemistry and scientific research, the determination of the aniline point of engine oil helps to assess its environmental risks; reflect the composition and purity of the oil product, and assist in judging whether the oil product complies with relevant standards and specifications; guide the selection and application of the product; evaluate its compatibility with aromatic hydrocarbon substances and high-temperature stability, so as to prevent the oil product from precipitating sediments or reacting with rubber seals during actual use, which may affect operational safety. The experiment is carried out in accordance with the GB/T 262 standard. The SD262B Automatic Aniline Point Tester manufactured by Shengtai Instruments complies with this standard and is selected for the experiment. Experimental Instruments & Samples ①SD262B Automatic Aniline Point Tester ②Auxiliary items including test tubes, aniline, sodium sulfate for industrial use, n-heptane, cleaning solvents, etc. Testing method： ①Inspect components such as the temperature sensor and photoelectric detector, and perform necessary adjustments and calibrations. ②Select the test mode according to the sample properties and set the expected temperature range. ③Inject the sample into the sample tube, avoiding bubble formation or overflow. ④Start the test; the instrument will automatically complete heating, stirring, cooling and endpoint determination with full-process intelligent control. ⑤After the test is completed, the instrument displays and stores the aniline point temperature value, and supports printing or data export. Experimental Results： Through multiple experimental tests and analyses, the aniline point of this engine oil is greater than 85°C, which complies with the standard.

Overview     Eggshell strength is one of the core indicators for measuring poultry egg quality, directly related to the economic benefits of breeding production and the safety of product circulation. As an important evaluation criterion for the production performance of breeding chickens and laying hens, eggshell strength not only affects the hatching rate of breeding eggs and the quality of chicks but also plays a decisive role in the shelf life and transportation loss rate of commercial eggs. Currently, some chicken farms suffer serious economic losses due to poor eggshell quality, which leads to problems such as transportation damage and storage deterioration. Therefore, accurately testing eggshell strength and mastering core data have become a key demand in breeding, processing, and circulation links.   Experimental Purpose     By scientifically testing the maximum pressure that eggshells can withstand, this experiment aims to accurately determine the quality grade of poultry eggs and provide data support for breeding optimization, product grading, and circulation protection. Following industry general testing standards, this experiment adopts the ST120H Eggshell Strength Tester, which integrates modern mechanical design concepts and microcomputer processing technology, featuring high precision and intelligence to achieve rapid and accurate measurement of eggshell strength.   Experimental Samples and Instruments   - Experimental samples: Chicken eggs, duck eggs, goose eggs (covering common poultry egg varieties with different shell thicknesses) - Experimental instruments: ST120H Eggshell Strength Tester (including main unit, power cord, printing paper, and supporting egg tray), cleaning reagents, and other auxiliary accessories.     Operational Steps   1. Check in advance whether the instrument's power supply matches the AC220V 50Hz standard, and ensure the ambient temperature is (20±10)℃ with relative humidity below 85% for suitable operating conditions. 2. Wash and dry the poultry eggs to be tested, place them stably on the special egg tray, and then put the egg tray and eggs together in the center of the instrument's test platform to ensure the eggs are firmly placed. 3. Connect the power supply and turn on the instrument to directly enter the test interface. Configure the test scheme by setting parameters such as test speed (default 100mm/min, adjustable as needed), sample name, and sample number via the touch screen. 4. Click the "Test" button on the main interface to start the test program. The pressure plate applies pressure steadily at the preset speed, and the system collects and displays data such as pressure and displacement in real time. 5. When the eggshell breaks, the instrument automatically determines the maximum force value, stops applying pressure, and records the data, supporting one-click printing of test results. For continuous testing, there is no need to shut down the instrument; simply place the next sample and click "Continue Test". 6. After the experiment, click the "Return" and "Zero" buttons, clean the test platform and egg tray, and turn off the power supply.   Data Analysis and Result Evaluation     Batch testing of different varieties and batches of poultry eggs using the ST120H Eggshell Strength Tester shows that the instrument has a measurement range of 5~500N, a resolution of 0.1N, and a relative error of only 1%, fully meeting the precision requirements of daily testing. The eggshell strength of chicken eggs is generally 30~50N, duck eggs 45~65N, and goose eggs 60~85N, all within the normal strength range of respective poultry egg varieties. The instrument can automatically calculate the maximum value, minimum value, and average value of multiple groups of samples. The tested data, after printing or storage, can be directly used for breeding scheme optimization and commercial egg grading standard formulation, effectively reducing the risk of damage during circulation and providing reliable technical support for the standardized quality control of the poultry egg industry.

Test Methods for Water Content in Petroleum Products Petroleum products refer to the general term for various commodities obtained through processing, using petroleum or a certain part of petroleum as raw materials. Different from unprocessed crude oil (a dark brown viscous liquid), they are the products of crude oil processed in refineries. There is a wide variety of petroleum products, which can be mainly divided into the following six major categories: fuels, solvents and chemical raw materials, lubricants, paraffin and its products, petroleum asphalt, and petroleum coke. Purpose of the Experiment The main purposes of determining the water content in petroleum products are to ensure the quality of the oil products, guarantee production safety, and optimize application performance. By measuring the water content, the actual quantity of the oil products can be accurately calculated. The presence of water can cause various hazards to the use and production process of petroleum products: triggering low-temperature failures; water can promote the oxidation and gelatinization of oil products, shortening their service life; and damaging the lubrication system. Based on the determination results of water content, appropriate dehydration methods can be identified, and the production process can be controlled. Experimental Instruments & Samples Experimental Samples：Petroleum Products Experimental Instrument：SH103A automatic trace moisture meter Complying with the standard ASTM D1744 Testing method 1.Titration Operation: Add the sample solvent (with Karl Fischer reagent already added) into the titration flask, then add the prepared oil sample into the flask, and ensure the sample is completely dissolved. 2.Data Recording: Record the volume of Karl Fischer reagent consumed during the titration process.‌ Experimental Results The measured water content is all below 50 ppm, which is far lower than the requirement of GB 36170-2018 (≤0.5% water content in crude oil, equivalent to 5000 ppm), indicating that the oil product is of excellent quality.

The ST102 Adhesive testing machine for ointment patches is designed in strict accordance with the requirements of the 2020 Chinese Pharmacopoeia "0952 Adhesion Force Determination Method". It adopts modern mechanical design concepts, ergonomic design principles and advanced microcomputer processing technology, featuring novel design, convenient use, excellent performance and beautiful appearance. It is mainly used for testing the adhesive force of ointment patches. Load range: the range of force that the instrument can measure, with the unit of mN. The ST102 Adhesive testing machine for ointment patches has a load range of 0-5000mN. Its main features include: using high-precision force sensors to ensure testing accuracy errors within ±1%; adopting stepper motor control for accurate and stable movement of the measuring head and good repeatability of measurement results; friendly human-machine interface operation with fully automatic testing, testing data statistics and processing functions, and output from a micro printer; automatic memorization and display of test results to reduce human error; and being equipped with computer connection software for automatic communication, storage and printing of test results.

The Kjeldahl nitrogen analyzer is an analytical instrument designed based on the principle of the Kjeldahl nitrogen determination method. Its core function is to measure the content of nitrogen-containing substances such as ammonia nitrogen and protein nitrogen in various samples. The accuracy of its test results is directly related to the quality assessment of food, feed and other products. In practical applications, after the samples are digested at high temperatures in a digestion furnace, they are distilled through a still. The nitrogen content is ultimately calculated, and then the content of substances such as protein is estimated. The ST-04BS Kjeldahl nitrogen determinator is composed of the ST-04B nitrogen determinator distiller and the ST-04C digital display digestion furnace, featuring efficient and precise detection capabilities. Its measurement range is wide and it can be used for the detection of various samples such as grains, foods, dairy products, beverages, feeds, soils, water, drugs, sediments and chemicals. The nitrogen content determination range is 0.02-95% (or 0.1-200 nitrogen), with a relative difference accuracy of up to 1%, which can meet the detection tasks with different precision requirements. The working voltage of this instrument is AC 220V 50HZ, with a total power of 1200W (including 800W for the distiller). It is equipped with a 4-hole digestion furnace and can process 4 samples at a time. It takes about 40 minutes to digest a batch of samples, balancing efficiency and capacity. The overall weight of the instrument is 25 kilograms, and its volume is 380×330×820mm, which is convenient for placement in the laboratory. The harmful gases such as SO₂ that escape during the digestion process can be discharged from the water into the sewer through the sewage pipe on the digestion furnace and the exhaust three-way valve, reducing the impact on the environment.   The test results of the ST-04BS Kjeldahl nitrogen analyzer comply with the indicators stipulated in GB/T6432-2018 "Determination of Crude Protein in Feed - Kjeldahl Nitrogen Determination Method", and are applicable to multiple fields such as food processing, feed production, and environmental monitoring, providing reliable technical support for the quality control and component analysis of related products.