In June 2025, the technical team of Shanghai Zealquest Technology Co., Ltd. was invited to visit WALZ GmbH in Germany to participate in a 5-day instrument technical training. This training focused on the innovative functions and application expansion of several new photosynthesis measurement devices under WALZ, laying a solid foundation for Zealquest Technology to further optimize domestic scientific research services and promote cutting-edge technologies.
The new PHYTO-PAM-II is specially designed for phytoplankton research and plays a key role in fields such as aquatic biology and aquatic ecology. It can automatically classify and qualitatively analyze cyanobacteria, green algae, diatoms/dinoflagellates, and cryptophytes in natural water bodies, and at the same time accurately measure the chlorophyll a content of various algae to achieve quantitative analysis. The instrument can obtain rich data on algal photosynthetic activity, such as photosynthetic efficiency, photosynthetic rate, and rapid light curves. Its upgraded technical features are remarkable, providing 5 wavelengths of pulse-modulated measuring light and actinic light. Using on-board LED array chip technology, it can classify four types of algae in real-time, and also carry out standard PAM measurements and millisecond-level fluorescence rise kinetic analysis, and determine the functional light-harvesting cross-section of photosystem II, providing a comprehensive and accurate means for algal photosynthesis research.
The newly upgraded WATER-PAM-II is a portable algal chlorophyll fluorescence measuring device, suitable for analyzing the photosynthesis of various phytoplankton samples. When the chlorophyll content of the sample is extremely low and ultra-sensitive fluorescence detection is required, it is the best choice, which can be used for laboratory culture and natural water sample detection. The instrument has a wide sensitivity spectrum range, can easily switch between red and blue light modes for measuring light and actinic light, and is equipped with various accessories such as a flow-through cuvette, with rich application scenarios. It can not only analyze in detail the photosynthetic activity and quenching parameters of phytoplankton samples but also add the function of algae content difference analysis. It can calculate and analyze the composition of cyanobacteria, green algae, diatoms/dinoflagellates and chlorophyll a concentration in natural water bodies based on the differences in fluorescence excitation spectra of different algae at specific wavelengths, providing strong data support for water ecological research.
MINI-PAM-II/POROMETER has the advantages of high sensitivity, small size, durability and easy operation, making it a standard equipment for field photosynthesis research. It perfectly combines mature optical fiber technology with modern LED and computer technology, and is equipped with a sunlight-readable touch screen with a user-friendly interface. The instrument can automatically calculate and display key parameters of saturation pulse analysis, measure fluorescence induction curves and perform quenching analysis, and also measure light response curves and rapid light curves. The newly added stomatal measurement module can sensitively monitor the dynamic response of plant fluorescence and stomata to environmental changes, further expanding its application range. In addition, it is powered by AA batteries, and spare batteries are easy to obtain, making it suitable for long-term field operations, and can be combined with a photosynthesis meter through a micro-optical fiber, providing great convenience for photosynthesis research.
The newly launched MULTI-COLOR-PAM-II allows us to glimpse the deeper mysteries of chlorophyll fluorescence. With its ultra-high time resolution, we can explore different states of the oxygen-evolving complex (OEC) cycle-4 oscillation S-state water oxidation clock, high time-resolution OJIP/O-I1-I2-P fluorescence transients, QA- re-reduction kinetic curves, PSII antenna light-harvesting cross-section (nm²) measured based on O-I1 fast phase, P680+ re-reduction kinetics, and the generation and decay of carotenoid triplet fluorescence quenching, etc.
Due to the 4 measurement channels of DUAL-KLAS-NIR, its ability to monitor photosynthetic components is greatly enhanced. It can simultaneously measure changes in chlorophyll fluorescence, P700, PC, and Fd, helping us to explore the fine regulatory processes of photosynthesis and the subtle effects of environmental changes on photosynthetic apparatus from a more comprehensive perspective.
This newly developed, compact and exquisite handheld device LSA-2050 allows us to simply and quickly obtain a large amount of photosynthetic and pigment information related to plants, which is closely related to plant stress resistance, photodamage defense, ultraviolet resistance, antioxidant substances, and health-care component content. Its unique design can not only measure plant leaves but also fruits.
As an important partner of WALZ GmbH in China, Zealquest Technology has been committed to introducing international cutting-edge technologies into China. This in-depth study of WALZ instruments will help Zealquest Technology provide more professional and efficient technical support and solutions for domestic scientific research users, promote the fields of plant physiological ecology and water algae monitoring to new heights, and provide strong support for domestic scientific research innovation!
